diff --git a/datafusion/_modules/datafusion.html b/datafusion/_modules/datafusion.html
index 795ad2b05199..a52de5209e93 100644
--- a/datafusion/_modules/datafusion.html
+++ b/datafusion/_modules/datafusion.html
@@ -6,27 +6,27 @@
     <meta charset="utf-8" />
     <title>datafusion &#8212; Arrow Datafusion  documentation</title>
     
-  <link href="../_static/css/theme.css" rel="stylesheet" />
-  <link href="../_static/css/index.c5995385ac14fb8791e8eb36b4908be2.css" rel="stylesheet" />
-
+    <link href="../_static/styles/theme.css?digest=1999514e3f237ded88cf" rel="stylesheet">
+<link href="../_static/styles/pydata-sphinx-theme.css?digest=1999514e3f237ded88cf" rel="stylesheet">
+  
     
-  <link rel="stylesheet"
-    href="../_static/vendor/fontawesome/5.13.0/css/all.min.css">
-  <link rel="preload" as="font" type="font/woff2" crossorigin
-    href="../_static/vendor/fontawesome/5.13.0/webfonts/fa-solid-900.woff2">
-  <link rel="preload" as="font" type="font/woff2" crossorigin
-    href="../_static/vendor/fontawesome/5.13.0/webfonts/fa-brands-400.woff2">
-
+    <link rel="stylesheet"
+      href="../_static/vendor/fontawesome/5.13.0/css/all.min.css">
+    <link rel="preload" as="font" type="font/woff2" crossorigin
+      href="../_static/vendor/fontawesome/5.13.0/webfonts/fa-solid-900.woff2">
+    <link rel="preload" as="font" type="font/woff2" crossorigin
+      href="../_static/vendor/fontawesome/5.13.0/webfonts/fa-brands-400.woff2">
+  
     
       
-
+  
     
-    <link rel="stylesheet" href="../_static/basic.css" type="text/css" />
+    <link rel="stylesheet" href="../_static/styles/pydata-sphinx-theme.css" type="text/css" />
     <link rel="stylesheet" href="../_static/pygments.css" type="text/css" />
     <link rel="stylesheet" type="text/css" href="../_static/theme_overrides.css" />
     
-  <link rel="preload" as="script" href="../_static/js/index.1c5a1a01449ed65a7b51.js">
-
+    <link rel="preload" as="script" href="../_static/scripts/pydata-sphinx-theme.js?digest=1999514e3f237ded88cf">
+  
     <script id="documentation_options" data-url_root="../" src="../_static/documentation_options.js"></script>
     <script src="../_static/jquery.js"></script>
     <script src="../_static/underscore.js"></script>
@@ -35,7 +35,10 @@
     <link rel="index" title="Index" href="../genindex.html" />
     <link rel="search" title="Search" href="../search.html" />
     <meta name="viewport" content="width=device-width, initial-scale=1" />
-    <meta name="docsearch:language" content="en" />
+    <meta name="docsearch:language" content="None">
+    
+
+    <!-- Google Analytics -->
     
   </head>
   <body data-spy="scroll" data-target="#bd-toc-nav" data-offset="80">
@@ -51,6 +54,7 @@
             
             <!-- Only show if we have sidebars configured, else just a small margin  -->
             <div class="col-12 col-md-3 bd-sidebar">
+              <div class="sidebar-start-items">
 <a class="navbar-brand" href="../index.html">
   <img src="../_static/images/DataFusion-Logo-Background-White.png" class="logo" alt="logo">
 </a>
@@ -63,7 +67,7 @@
 <nav class="bd-links" id="bd-docs-nav" aria-label="Main navigation">
   <div class="bd-toc-item active">
     
-    <p class="caption">
+    <p>
  <span class="caption-text">
   Supported Environments
  </span>
@@ -172,7 +176,7 @@
   </a>
  </li>
 </ul>
-<p class="caption">
+<p>
  <span class="caption-text">
   User Guide
  </span>
@@ -208,6 +212,11 @@
    </i>
   </label>
   <ul>
+   <li class="toctree-l2">
+    <a class="reference internal" href="../user-guide/sql/sql_status.html">
+     Status
+    </a>
+   </li>
    <li class="toctree-l2">
     <a class="reference internal" href="../user-guide/sql/select.html">
      SELECT syntax
@@ -312,7 +321,7 @@
   </a>
  </li>
 </ul>
-<p class="caption">
+<p>
  <span class="caption-text">
   Specification
  </span>
@@ -333,8 +342,13 @@
    Datafusion output field name semantic
   </a>
  </li>
+ <li class="toctree-l1">
+  <a class="reference internal" href="../specification/quarterly_roadmap.html">
+   Roadmap
+  </a>
+ </li>
 </ul>
-<p class="caption">
+<p>
  <span class="caption-text">
   README
  </span>
@@ -351,7 +365,7 @@
   </a>
  </li>
 </ul>
-<p class="caption">
+<p>
  <span class="caption-text">
   Community
  </span>
@@ -377,6 +391,9 @@
     
   </div>
 </nav>
+              </div>
+              <div class="sidebar-end-items">
+              </div>
             </div>
             
           
@@ -416,6 +433,12 @@ <h1>Source code for datafusion</h1><div class="highlight"><pre>
 <span class="kn">from</span> <span class="nn">abc</span> <span class="kn">import</span> <span class="n">ABCMeta</span><span class="p">,</span> <span class="n">abstractmethod</span>
 <span class="kn">from</span> <span class="nn">typing</span> <span class="kn">import</span> <span class="n">List</span>
 
+<span class="k">try</span><span class="p">:</span>
+    <span class="kn">import</span> <span class="nn">importlib.metadata</span> <span class="k">as</span> <span class="nn">importlib_metadata</span>
+<span class="k">except</span> <span class="ne">ImportError</span><span class="p">:</span>
+    <span class="kn">import</span> <span class="nn">importlib_metadata</span>
+
+
 <span class="kn">import</span> <span class="nn">pyarrow</span> <span class="k">as</span> <span class="nn">pa</span>
 
 <span class="kn">from</span> <span class="nn">._internal</span> <span class="kn">import</span> <span class="p">(</span>
@@ -427,6 +450,9 @@ <h1>Source code for datafusion</h1><div class="highlight"><pre>
 <span class="p">)</span>
 
 
+<span class="n">__version__</span> <span class="o">=</span> <span class="n">importlib_metadata</span><span class="o">.</span><span class="n">version</span><span class="p">(</span><span class="vm">__name__</span><span class="p">)</span>
+
+
 <span class="n">__all__</span> <span class="o">=</span> <span class="p">[</span>
     <span class="s2">&quot;DataFrame&quot;</span><span class="p">,</span>
     <span class="s2">&quot;ExecutionContext&quot;</span><span class="p">,</span>
@@ -512,10 +538,9 @@ <h1>Source code for datafusion</h1><div class="highlight"><pre>
               </div>
               
               
-              <div class='prev-next-bottom'>
-                
-
-              </div>
+              <!-- Previous / next buttons -->
+<div class='prev-next-area'>
+</div>
               
           </main>
           
@@ -523,20 +548,19 @@ <h1>Source code for datafusion</h1><div class="highlight"><pre>
       </div>
     </div>
   
-  <script src="../_static/js/index.1c5a1a01449ed65a7b51.js"></script>
-
+    <script src="../_static/scripts/pydata-sphinx-theme.js?digest=1999514e3f237ded88cf"></script>
   <footer class="footer mt-5 mt-md-0">
   <div class="container">
     
     <div class="footer-item">
       <p class="copyright">
-    &copy; Copyright 2021, Apache Software Foundation.<br/>
+    &copy; Copyright 2021, Apache Software Foundation.<br>
 </p>
     </div>
     
     <div class="footer-item">
       <p class="sphinx-version">
-Created using <a href="http://sphinx-doc.org/">Sphinx</a> 2.4.4.<br/>
+Created using <a href="http://sphinx-doc.org/">Sphinx</a> 2.4.4.<br>
 </p>
     </div>
     
diff --git a/datafusion/_modules/index.html b/datafusion/_modules/index.html
index 4f74b347ba9e..2e1974c64321 100644
--- a/datafusion/_modules/index.html
+++ b/datafusion/_modules/index.html
@@ -6,27 +6,27 @@
     <meta charset="utf-8" />
     <title>Overview: module code &#8212; Arrow Datafusion  documentation</title>
     
-  <link href="../_static/css/theme.css" rel="stylesheet" />
-  <link href="../_static/css/index.c5995385ac14fb8791e8eb36b4908be2.css" rel="stylesheet" />
-
+    <link href="../_static/styles/theme.css?digest=1999514e3f237ded88cf" rel="stylesheet">
+<link href="../_static/styles/pydata-sphinx-theme.css?digest=1999514e3f237ded88cf" rel="stylesheet">
+  
     
-  <link rel="stylesheet"
-    href="../_static/vendor/fontawesome/5.13.0/css/all.min.css">
-  <link rel="preload" as="font" type="font/woff2" crossorigin
-    href="../_static/vendor/fontawesome/5.13.0/webfonts/fa-solid-900.woff2">
-  <link rel="preload" as="font" type="font/woff2" crossorigin
-    href="../_static/vendor/fontawesome/5.13.0/webfonts/fa-brands-400.woff2">
-
+    <link rel="stylesheet"
+      href="../_static/vendor/fontawesome/5.13.0/css/all.min.css">
+    <link rel="preload" as="font" type="font/woff2" crossorigin
+      href="../_static/vendor/fontawesome/5.13.0/webfonts/fa-solid-900.woff2">
+    <link rel="preload" as="font" type="font/woff2" crossorigin
+      href="../_static/vendor/fontawesome/5.13.0/webfonts/fa-brands-400.woff2">
+  
     
       
-
+  
     
-    <link rel="stylesheet" href="../_static/basic.css" type="text/css" />
+    <link rel="stylesheet" href="../_static/styles/pydata-sphinx-theme.css" type="text/css" />
     <link rel="stylesheet" href="../_static/pygments.css" type="text/css" />
     <link rel="stylesheet" type="text/css" href="../_static/theme_overrides.css" />
     
-  <link rel="preload" as="script" href="../_static/js/index.1c5a1a01449ed65a7b51.js">
-
+    <link rel="preload" as="script" href="../_static/scripts/pydata-sphinx-theme.js?digest=1999514e3f237ded88cf">
+  
     <script id="documentation_options" data-url_root="../" src="../_static/documentation_options.js"></script>
     <script src="../_static/jquery.js"></script>
     <script src="../_static/underscore.js"></script>
@@ -35,7 +35,10 @@
     <link rel="index" title="Index" href="../genindex.html" />
     <link rel="search" title="Search" href="../search.html" />
     <meta name="viewport" content="width=device-width, initial-scale=1" />
-    <meta name="docsearch:language" content="en" />
+    <meta name="docsearch:language" content="None">
+    
+
+    <!-- Google Analytics -->
     
   </head>
   <body data-spy="scroll" data-target="#bd-toc-nav" data-offset="80">
@@ -51,6 +54,7 @@
             
             <!-- Only show if we have sidebars configured, else just a small margin  -->
             <div class="col-12 col-md-3 bd-sidebar">
+              <div class="sidebar-start-items">
 <a class="navbar-brand" href="../index.html">
   <img src="../_static/images/DataFusion-Logo-Background-White.png" class="logo" alt="logo">
 </a>
@@ -63,7 +67,7 @@
 <nav class="bd-links" id="bd-docs-nav" aria-label="Main navigation">
   <div class="bd-toc-item active">
     
-    <p class="caption">
+    <p>
  <span class="caption-text">
   Supported Environments
  </span>
@@ -172,7 +176,7 @@
   </a>
  </li>
 </ul>
-<p class="caption">
+<p>
  <span class="caption-text">
   User Guide
  </span>
@@ -208,6 +212,11 @@
    </i>
   </label>
   <ul>
+   <li class="toctree-l2">
+    <a class="reference internal" href="../user-guide/sql/sql_status.html">
+     Status
+    </a>
+   </li>
    <li class="toctree-l2">
     <a class="reference internal" href="../user-guide/sql/select.html">
      SELECT syntax
@@ -312,7 +321,7 @@
   </a>
  </li>
 </ul>
-<p class="caption">
+<p>
  <span class="caption-text">
   Specification
  </span>
@@ -333,8 +342,13 @@
    Datafusion output field name semantic
   </a>
  </li>
+ <li class="toctree-l1">
+  <a class="reference internal" href="../specification/quarterly_roadmap.html">
+   Roadmap
+  </a>
+ </li>
 </ul>
-<p class="caption">
+<p>
  <span class="caption-text">
   README
  </span>
@@ -351,7 +365,7 @@
   </a>
  </li>
 </ul>
-<p class="caption">
+<p>
  <span class="caption-text">
   Community
  </span>
@@ -377,6 +391,9 @@
     
   </div>
 </nav>
+              </div>
+              <div class="sidebar-end-items">
+              </div>
             </div>
             
           
@@ -396,19 +413,15 @@
               <div>
                 
   <h1>All modules for which code is available</h1>
-<ul><li><a href="builtins.html">builtins</a></li>
-<li><a href="datafusion.html">datafusion</a></li>
-<ul><li><a href="datafusion/functions.html">datafusion.functions</a></li>
-</ul><li><a href="functions.html">functions</a></li>
+<ul><li><a href="datafusion.html">datafusion</a></li>
 </ul>
 
               </div>
               
               
-              <div class='prev-next-bottom'>
-                
-
-              </div>
+              <!-- Previous / next buttons -->
+<div class='prev-next-area'>
+</div>
               
           </main>
           
@@ -416,20 +429,19 @@ <h1>All modules for which code is available</h1>
       </div>
     </div>
   
-  <script src="../_static/js/index.1c5a1a01449ed65a7b51.js"></script>
-
+    <script src="../_static/scripts/pydata-sphinx-theme.js?digest=1999514e3f237ded88cf"></script>
   <footer class="footer mt-5 mt-md-0">
   <div class="container">
     
     <div class="footer-item">
       <p class="copyright">
-    &copy; Copyright 2021, Apache Software Foundation.<br/>
+    &copy; Copyright 2021, Apache Software Foundation.<br>
 </p>
     </div>
     
     <div class="footer-item">
       <p class="sphinx-version">
-Created using <a href="http://sphinx-doc.org/">Sphinx</a> 2.4.4.<br/>
+Created using <a href="http://sphinx-doc.org/">Sphinx</a> 2.4.4.<br>
 </p>
     </div>
     
diff --git a/datafusion/_sources/community/communication.md.txt b/datafusion/_sources/community/communication.md.txt
index 7d8e58a80b5e..b34b913c6f56 100644
--- a/datafusion/_sources/community/communication.md.txt
+++ b/datafusion/_sources/community/communication.md.txt
@@ -52,13 +52,14 @@ server ([invite link](https://discord.gg/Qw5gKqHxUM)) in case you are not able
 to join the Slack workspace. If you need an invite to the Slack workspace, you
 can also ask for one in our Discord server.
 
-### Sync up Zoom calls
+### Sync up video calls
 
-We have biweekly sync calls every other Thursdays at 16:00 UTC
-(starting September 30, 2021) on Zoom [Meeting Link](https://influxdata.zoom.us/j/94666921249)
+We have biweekly sync calls every other Thursdays at both 04:00 UTC
+and 16:00 UTC (starting September 30, 2021) depending on if there are
+items on the agenda to discuss and someone being willing to host.
 
-The[agenda](https://docs.google.com/document/d/1atCVnoff5SR4eM4Lwf2M1BBJTY6g3_HUNR6qswYJW_U/edit)
-is available if you would like to add a topic for discussion or see what is planned.
+Please see the [agenda](https://docs.google.com/document/d/1atCVnoff5SR4eM4Lwf2M1BBJTY6g3_HUNR6qswYJW_U/edit)
+for the video call link, add topics and to see what others plan to discuss.
 
 The goals of these calls are:
 
@@ -75,9 +76,8 @@ Our source code is hosted on
 [GitHub](https://github.com/apache/arrow-datafusion). For developers new to
 the project, we have curated a
 [good-first-issue](https://github.com/apache/arrow-datafusion/issues?q=is%3Aissue+is%3Aopen+label%3A%22good+first+issue%22)
-list to help you get started.
+list to help you get started. You can find datafusion's major designs in docs/source/specification.
 
 We use GitHub issues for maintaining a queue of development work and as the
 public record. We often use Google docs, Github issues and pull requests for
-quick and small design discussions. For major design change proposals, please
-make sure to send them to the dev list for more visibility.
+quick and small design discussions. For major design change proposals, we encourage you to write a rfc.
diff --git a/datafusion/_sources/index.rst.txt b/datafusion/_sources/index.rst.txt
index bf6b25096b4b..5109e60338fa 100644
--- a/datafusion/_sources/index.rst.txt
+++ b/datafusion/_sources/index.rst.txt
@@ -55,6 +55,7 @@ Table of content
    specification/roadmap
    specification/invariants
    specification/output-field-name-semantic
+   specification/quarterly_roadmap
 
 .. _toc.readme:
 
diff --git a/datafusion/_sources/python/generated/datafusion.DataFrame.rst.txt b/datafusion/_sources/python/generated/datafusion.DataFrame.rst.txt
index 5cb937d3792b..9349590f60b0 100644
--- a/datafusion/_sources/python/generated/datafusion.DataFrame.rst.txt
+++ b/datafusion/_sources/python/generated/datafusion.DataFrame.rst.txt
@@ -1,4 +1,4 @@
-﻿datafusion.DataFrame
+datafusion.DataFrame
 ====================
 
 .. currentmodule:: datafusion
@@ -19,6 +19,7 @@
       ~DataFrame.filter
       ~DataFrame.join
       ~DataFrame.limit
+      ~DataFrame.schema
       ~DataFrame.select
       ~DataFrame.show
       ~DataFrame.sort
diff --git a/datafusion/_sources/python/generated/datafusion.ExecutionContext.rst.txt b/datafusion/_sources/python/generated/datafusion.ExecutionContext.rst.txt
index b22206d15494..de1ca4e5a84a 100644
--- a/datafusion/_sources/python/generated/datafusion.ExecutionContext.rst.txt
+++ b/datafusion/_sources/python/generated/datafusion.ExecutionContext.rst.txt
@@ -1,4 +1,4 @@
-﻿datafusion.ExecutionContext
+datafusion.ExecutionContext
 ===========================
 
 .. currentmodule:: datafusion
@@ -14,11 +14,15 @@
    .. autosummary::
    
       ~ExecutionContext.__init__
+      ~ExecutionContext.catalog
       ~ExecutionContext.create_dataframe
+      ~ExecutionContext.empty_table
       ~ExecutionContext.register_csv
       ~ExecutionContext.register_parquet
+      ~ExecutionContext.register_record_batches
       ~ExecutionContext.register_udf
       ~ExecutionContext.sql
+      ~ExecutionContext.table
       ~ExecutionContext.tables
    
    
diff --git a/datafusion/_sources/python/generated/datafusion.Expression.rst.txt b/datafusion/_sources/python/generated/datafusion.Expression.rst.txt
index fededbb41661..427fed0d34ed 100644
--- a/datafusion/_sources/python/generated/datafusion.Expression.rst.txt
+++ b/datafusion/_sources/python/generated/datafusion.Expression.rst.txt
@@ -1,4 +1,4 @@
-﻿datafusion.Expression
+datafusion.Expression
 =====================
 
 .. currentmodule:: datafusion
@@ -15,6 +15,10 @@
    
       ~Expression.__init__
       ~Expression.alias
+      ~Expression.cast
+      ~Expression.column
+      ~Expression.is_null
+      ~Expression.literal
       ~Expression.sort
    
    
diff --git a/datafusion/_sources/python/generated/datafusion.functions.rst.txt b/datafusion/_sources/python/generated/datafusion.functions.rst.txt
index 25f7cc35581f..1cee9ecf10f5 100644
--- a/datafusion/_sources/python/generated/datafusion.functions.rst.txt
+++ b/datafusion/_sources/python/generated/datafusion.functions.rst.txt
@@ -1,4 +1,4 @@
-﻿datafusion.functions
+datafusion.functions
 ====================
 
 .. automodule:: datafusion.functions
@@ -9,83 +9,8 @@
 
    
    
-   .. rubric:: Functions
-
-   .. autosummary::
-   
-      abs
-      acos
-      array
-      ascii
-      asin
-      atan
-      avg
-      bit_length
-      btrim
-      ceil
-      character_length
-      chr
-      col
-      concat
-      concat_ws
-      cos
-      count
-      exp
-      floor
-      in_list
-      initcap
-      left
-      lit
-      ln
-      log10
-      log2
-      lower
-      lpad
-      ltrim
-      max
-      md5
-      min
-      now
-      octet_length
-      random
-      regexp_replace
-      repeat
-      replace
-      reverse
-      right
-      round
-      rpad
-      rtrim
-      sha224
-      sha256
-      sha384
-      sha512
-      signum
-      sin
-      split_part
-      sqrt
-      starts_with
-      strpos
-      substr
-      sum
-      tan
-      to_hex
-      translate
-      trim
-      trunc
-      udaf
-      udf
-      upper
-   
    
 
    
    
-   
-
-   
-   
-   
-
-
-
+   
\ No newline at end of file
diff --git a/datafusion/_sources/specification/quarterly_roadmap.md.txt b/datafusion/_sources/specification/quarterly_roadmap.md.txt
new file mode 100644
index 000000000000..5bb805d7e7f0
--- /dev/null
+++ b/datafusion/_sources/specification/quarterly_roadmap.md.txt
@@ -0,0 +1,72 @@
+<!---
+  Licensed to the Apache Software Foundation (ASF) under one
+  or more contributor license agreements.  See the NOTICE file
+  distributed with this work for additional information
+  regarding copyright ownership.  The ASF licenses this file
+  to you under the Apache License, Version 2.0 (the
+  "License"); you may not use this file except in compliance
+  with the License.  You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+  Unless required by applicable law or agreed to in writing,
+  software distributed under the License is distributed on an
+  "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  KIND, either express or implied.  See the License for the
+  specific language governing permissions and limitations
+  under the License.
+-->
+
+# Roadmap
+
+A quarterly roadmap will be published to give the DataFusion community visibility into the priorities of the projects contributors. This roadmap is not binding.
+
+## 2022 Q1
+
+### DataFusion Core
+
+- Publish official Arrow2 branch
+- Implementation of memory manager (i.e. to enable spilling to disk as needed)
+
+### Benchmarking
+
+- Inclusion in Db-Benchmark with all quries covered
+- All TPCH queries covered
+
+### Performance Improvements
+
+- Predicate evaluation
+- Improve multi-column comparisons (that can't be vectorized at the moment)
+- Null constant support
+
+### New Features
+
+- Read JSON as table
+- Simplify DDL with Datafusion-Cli
+- Add Decimal128 data type and the attendant features such as Arrow Kernel and UDF support
+- Add new experimental e-graph based optimizer
+
+### Ballista
+
+- Begin work on design documents and plan / priorities for development
+
+### Extensions ([datafusion-contrib](https://github.com/datafusion-contrib]))
+
+- Stable S3 support
+- Begin design discussions and prototyping of a stream provider
+
+## Beyond 2022 Q1
+
+There is no clear timeline for the below, but community members have expressed interest in working on these topics.
+
+### DataFusion Core
+
+- Custom SQL support
+- Split DataFusion into multiple crates
+- Push based query execution and code generation
+
+### Ballista
+
+- Evolve architecture so that it can be deployed in a multi-tenant cloud native environment
+- Ensure Ballista is scalable, elastic, and stable for production usage
+- Develop distributed ML capabilities
diff --git a/datafusion/_sources/specification/rfcs/template.md.txt b/datafusion/_sources/specification/rfcs/template.md.txt
new file mode 100644
index 000000000000..98704fd46fe9
--- /dev/null
+++ b/datafusion/_sources/specification/rfcs/template.md.txt
@@ -0,0 +1,58 @@
+<!---
+  Licensed to the Apache Software Foundation (ASF) under one
+  or more contributor license agreements.  See the NOTICE file
+  distributed with this work for additional information
+  regarding copyright ownership.  The ASF licenses this file
+  to you under the Apache License, Version 2.0 (the
+  "License"); you may not use this file except in compliance
+  with the License.  You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+  Unless required by applicable law or agreed to in writing,
+  software distributed under the License is distributed on an
+  "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  KIND, either express or implied.  See the License for the
+  specific language governing permissions and limitations
+  under the License.
+-->
+
+Feature Name:
+
+Status: draft/in-progress/completed/
+
+Start Date: YYYY-MM-DD
+
+Authors:
+
+RFC PR: #
+
+Datafusion Issue: #
+
+---
+
+### Background
+
+---
+
+### Goals
+
+---
+
+### Non-Goals
+
+---
+
+### Survey
+
+---
+
+### General design
+
+---
+
+### Detailed design
+
+---
+
+### Others
diff --git a/datafusion/_sources/specification/roadmap.md.txt b/datafusion/_sources/specification/roadmap.md.txt
index 09f636f3bb7f..76b2896aa71c 100644
--- a/datafusion/_sources/specification/roadmap.md.txt
+++ b/datafusion/_sources/specification/roadmap.md.txt
@@ -49,16 +49,15 @@ to provide:
 
 ## Additional SQL Language Features
 
+- Decimal Support [#122](https://github.com/apache/arrow-datafusion/issues/122)
 - Complete support list on [status](https://github.com/apache/arrow-datafusion/blob/master/README.md#status)
 - Timestamp Arithmetic [#194](https://github.com/apache/arrow-datafusion/issues/194)
 - SQL Parser extension point [#533](https://github.com/apache/arrow-datafusion/issues/533)
 - Support for nested structures (fields, lists, structs) [#119](https://github.com/apache/arrow-datafusion/issues/119)
-- Remaining Set Operators (`INTERSECT` / `EXCEPT`) [#1082](https://github.com/apache/arrow-datafusion/issues/1082)
 - Run all queries from the TPCH benchmark (see [milestone](https://github.com/apache/arrow-datafusion/milestone/2) for more details)
 
 ## Query Optimizer
 
-- Additional constant folding / partial evaluation [#1070](https://github.com/apache/arrow-datafusion/issues/1070)
 - More sophisticated cost based optimizer for join ordering
 - Implement advanced query optimization framework (Tokomak) #440
 - Finer optimizations for group by and aggregate functions
@@ -66,7 +65,6 @@ to provide:
 ## Datasources
 
 - Better support for reading data from remote filesystems (e.g. S3) without caching it locally [#907](https://github.com/apache/arrow-datafusion/issues/907) [#1060](https://github.com/apache/arrow-datafusion/issues/1060)
-- Support for partitioned datasources [#1139](https://github.com/apache/arrow-datafusion/issues/1139) and make the integration of other table formats (Delta, Iceberg...) simpler
 - Improve performances of file format datasources (parallelize file listings, async Arrow readers, file chunk prefetching capability...)
 
 ## Runtime / Infrastructure
diff --git a/datafusion/_sources/user-guide/cli.md.txt b/datafusion/_sources/user-guide/cli.md.txt
index cb95fba5113a..1d2d6b79d415 100644
--- a/datafusion/_sources/user-guide/cli.md.txt
+++ b/datafusion/_sources/user-guide/cli.md.txt
@@ -72,3 +72,49 @@ The DataFusion CLI can also connect to a Ballista scheduler for query execution.
 ```bash
 datafusion-cli --host localhost --port 50050
 ```
+
+## Cli commands
+
+Available commands inside DataFusion CLI are:
+
+- Quit
+
+```bash
+> \q
+```
+
+- Help
+
+```bash
+> \?
+```
+
+- ListTables
+
+```bash
+> \d
+```
+
+- DescribeTable
+
+```bash
+> \d table_name
+```
+
+- QuietMode
+
+```
+> \quiet [true|false]
+```
+
+- list function
+
+```bash
+> \h
+```
+
+- Search and describe function
+
+```bash
+> \h function_table
+```
diff --git a/datafusion/_sources/user-guide/sql/ddl.md.txt b/datafusion/_sources/user-guide/sql/ddl.md.txt
index b48179d4f229..eb10f40de5a6 100644
--- a/datafusion/_sources/user-guide/sql/ddl.md.txt
+++ b/datafusion/_sources/user-guide/sql/ddl.md.txt
@@ -54,3 +54,31 @@ STORED AS CSV
 WITH HEADER ROW
 LOCATION '/path/to/aggregate_test_100.csv';
 ```
+
+## CREATE MEMORY TABLE
+
+Memory table can be created with query.
+
+```
+CREATE TABLE TABLE_NAME AS [SELECT | VALUES LIST]
+```
+
+```sql
+CREATE TABLE valuetable AS VALUES(1,'HELLO'),(12,'DATAFUSION');
+
+CREATE TABLE memtable as select * from valuetable;
+```
+
+## DROP TABLE
+
+The table can be deleted.
+
+```
+DROP TABLE [ IF EXISTS ] name
+```
+
+```sql
+CREATE TABLE users AS VALUES(1,2),(2,3);
+
+DROP TABLE users;
+```
diff --git a/datafusion/_sources/user-guide/sql/index.rst.txt b/datafusion/_sources/user-guide/sql/index.rst.txt
index 2489f6ba1f10..fc96acc8733c 100644
--- a/datafusion/_sources/user-guide/sql/index.rst.txt
+++ b/datafusion/_sources/user-guide/sql/index.rst.txt
@@ -21,6 +21,7 @@ SQL Reference
 .. toctree::
    :maxdepth: 2
 
+   sql_status
    select
    ddl
    DataFusion Functions <datafusion-functions>
diff --git a/datafusion/_sources/user-guide/sql/sql_status.md.txt b/datafusion/_sources/user-guide/sql/sql_status.md.txt
new file mode 100644
index 000000000000..0df14e58a8be
--- /dev/null
+++ b/datafusion/_sources/user-guide/sql/sql_status.md.txt
@@ -0,0 +1,241 @@
+<!---
+  Licensed to the Apache Software Foundation (ASF) under one
+  or more contributor license agreements.  See the NOTICE file
+  distributed with this work for additional information
+  regarding copyright ownership.  The ASF licenses this file
+  to you under the Apache License, Version 2.0 (the
+  "License"); you may not use this file except in compliance
+  with the License.  You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+  Unless required by applicable law or agreed to in writing,
+  software distributed under the License is distributed on an
+  "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  KIND, either express or implied.  See the License for the
+  specific language governing permissions and limitations
+  under the License.
+-->
+
+# Status
+
+## General
+
+- [x] SQL Parser
+- [x] SQL Query Planner
+- [x] Query Optimizer
+- [x] Constant folding
+- [x] Join Reordering
+- [x] Limit Pushdown
+- [x] Projection push down
+- [x] Predicate push down
+- [x] Type coercion
+- [x] Parallel query execution
+
+## SQL Support
+
+- [x] Projection
+- [x] Filter (WHERE)
+- [x] Filter post-aggregate (HAVING)
+- [x] Limit
+- [x] Aggregate
+- [x] Common math functions
+- [x] cast
+- [x] try_cast
+- [x] [`VALUES` lists](https://www.postgresql.org/docs/current/queries-values.html)
+- Postgres compatible String functions
+  - [x] ascii
+  - [x] bit_length
+  - [x] btrim
+  - [x] char_length
+  - [x] character_length
+  - [x] chr
+  - [x] concat
+  - [x] concat_ws
+  - [x] initcap
+  - [x] left
+  - [x] length
+  - [x] lpad
+  - [x] ltrim
+  - [x] octet_length
+  - [x] regexp_replace
+  - [x] repeat
+  - [x] replace
+  - [x] reverse
+  - [x] right
+  - [x] rpad
+  - [x] rtrim
+  - [x] split_part
+  - [x] starts_with
+  - [x] strpos
+  - [x] substr
+  - [x] to_hex
+  - [x] translate
+  - [x] trim
+- Miscellaneous/Boolean functions
+  - [x] nullif
+- Approximation functions
+  - [x] approx_distinct
+- Common date/time functions
+  - [ ] Basic date functions
+  - [ ] Basic time functions
+  - [x] Basic timestamp functions
+    - [x] [to_timestamp](docs/user-guide/book/sql/datafusion-functions.html#to_timestamp)
+    - [x] [to_timestamp_millis](docs/user-guide/book/sql/datafusion-functions.html#to_timestamp_millis)
+    - [x] [to_timestamp_micros](docs/user-guide/book/sql/datafusion-functions.html#to_timestamp_micros)
+    - [x] [to_timestamp_seconds](docs/user-guide/book/sql/datafusion-functions.html#to_timestamp_seconds)
+- nested functions
+  - [x] Array of columns
+- [x] Schema Queries
+  - [x] SHOW TABLES
+  - [x] SHOW COLUMNS
+  - [x] information_schema.{tables, columns}
+  - [ ] information_schema other views
+- [x] Sorting
+- [ ] Nested types
+- [ ] Lists
+- [x] Subqueries
+- [x] Common table expressions
+- [x] Set Operations
+  - [x] UNION ALL
+  - [x] UNION
+  - [x] INTERSECT
+  - [x] INTERSECT ALL
+  - [x] EXCEPT
+  - [x] EXCEPT ALL
+- [x] Joins
+  - [x] INNER JOIN
+  - [x] LEFT JOIN
+  - [x] RIGHT JOIN
+  - [x] FULL JOIN
+  - [x] CROSS JOIN
+- [ ] Window
+  - [x] Empty window
+  - [x] Common window functions
+  - [x] Window with PARTITION BY clause
+  - [x] Window with ORDER BY clause
+  - [ ] Window with FILTER clause
+  - [ ] [Window with custom WINDOW FRAME](https://github.com/apache/arrow-datafusion/issues/361)
+  - [ ] UDF and UDAF for window functions
+
+## Data Sources
+
+- [x] CSV
+- [x] Parquet primitive types
+- [ ] Parquet nested types
+
+## Extensibility
+
+DataFusion is designed to be extensible at all points. To that end, you can provide your own custom:
+
+- [x] User Defined Functions (UDFs)
+- [x] User Defined Aggregate Functions (UDAFs)
+- [x] User Defined Table Source (`TableProvider`) for tables
+- [x] User Defined `Optimizer` passes (plan rewrites)
+- [x] User Defined `LogicalPlan` nodes
+- [x] User Defined `ExecutionPlan` nodes
+
+## Rust Version Compatbility
+
+This crate is tested with the latest stable version of Rust. We do not currently test against other, older versions of the Rust compiler.
+
+# Supported SQL
+
+This library currently supports many SQL constructs, including
+
+- `CREATE EXTERNAL TABLE X STORED AS PARQUET LOCATION '...';` to register a table's locations
+- `SELECT ... FROM ...` together with any expression
+- `ALIAS` to name an expression
+- `CAST` to change types, including e.g. `Timestamp(Nanosecond, None)`
+- Many mathematical unary and binary expressions such as `+`, `/`, `sqrt`, `tan`, `>=`.
+- `WHERE` to filter
+- `GROUP BY` together with one of the following aggregations: `MIN`, `MAX`, `COUNT`, `SUM`, `AVG`, `CORR`, `VAR`, `COVAR`, `STDDEV` (sample and population)
+- `ORDER BY` together with an expression and optional `ASC` or `DESC` and also optional `NULLS FIRST` or `NULLS LAST`
+
+## Supported Functions
+
+DataFusion strives to implement a subset of the [PostgreSQL SQL dialect](https://www.postgresql.org/docs/current/functions.html) where possible. We explicitly choose a single dialect to maximize interoperability with other tools and allow reuse of the PostgreSQL documents and tutorials as much as possible.
+
+Currently, only a subset of the PostgreSQL dialect is implemented, and we will document any deviations.
+
+## Schema Metadata / Information Schema Support
+
+DataFusion supports the showing metadata about the tables available. This information can be accessed using the views of the ISO SQL `information_schema` schema or the DataFusion specific `SHOW TABLES` and `SHOW COLUMNS` commands.
+
+More information can be found in the [Postgres docs](https://www.postgresql.org/docs/13/infoschema-schema.html)).
+
+To show tables available for use in DataFusion, use the `SHOW TABLES` command or the `information_schema.tables` view:
+
+```sql
+> show tables;
++---------------+--------------------+------------+------------+
+| table_catalog | table_schema       | table_name | table_type |
++---------------+--------------------+------------+------------+
+| datafusion    | public             | t          | BASE TABLE |
+| datafusion    | information_schema | tables     | VIEW       |
++---------------+--------------------+------------+------------+
+
+> select * from information_schema.tables;
+
++---------------+--------------------+------------+--------------+
+| table_catalog | table_schema       | table_name | table_type   |
++---------------+--------------------+------------+--------------+
+| datafusion    | public             | t          | BASE TABLE   |
+| datafusion    | information_schema | TABLES     | SYSTEM TABLE |
++---------------+--------------------+------------+--------------+
+```
+
+To show the schema of a table in DataFusion, use the `SHOW COLUMNS` command or the or `information_schema.columns` view:
+
+```sql
+> show columns from t;
++---------------+--------------+------------+-------------+-----------+-------------+
+| table_catalog | table_schema | table_name | column_name | data_type | is_nullable |
++---------------+--------------+------------+-------------+-----------+-------------+
+| datafusion    | public       | t          | a           | Int32     | NO          |
+| datafusion    | public       | t          | b           | Utf8      | NO          |
+| datafusion    | public       | t          | c           | Float32   | NO          |
++---------------+--------------+------------+-------------+-----------+-------------+
+
+>   select table_name, column_name, ordinal_position, is_nullable, data_type from information_schema.columns;
++------------+-------------+------------------+-------------+-----------+
+| table_name | column_name | ordinal_position | is_nullable | data_type |
++------------+-------------+------------------+-------------+-----------+
+| t          | a           | 0                | NO          | Int32     |
+| t          | b           | 1                | NO          | Utf8      |
+| t          | c           | 2                | NO          | Float32   |
++------------+-------------+------------------+-------------+-----------+
+```
+
+## Supported Data Types
+
+DataFusion uses Arrow, and thus the Arrow type system, for query
+execution. The SQL types from
+[sqlparser-rs](https://github.com/ballista-compute/sqlparser-rs/blob/main/src/ast/data_type.rs#L57)
+are mapped to Arrow types according to the following table
+
+| SQL Data Type | Arrow DataType                    |
+| ------------- | --------------------------------- |
+| `CHAR`        | `Utf8`                            |
+| `VARCHAR`     | `Utf8`                            |
+| `UUID`        | _Not yet supported_               |
+| `CLOB`        | _Not yet supported_               |
+| `BINARY`      | _Not yet supported_               |
+| `VARBINARY`   | _Not yet supported_               |
+| `DECIMAL`     | `Float64`                         |
+| `FLOAT`       | `Float32`                         |
+| `SMALLINT`    | `Int16`                           |
+| `INT`         | `Int32`                           |
+| `BIGINT`      | `Int64`                           |
+| `REAL`        | `Float32`                         |
+| `DOUBLE`      | `Float64`                         |
+| `BOOLEAN`     | `Boolean`                         |
+| `DATE`        | `Date32`                          |
+| `TIME`        | `Time64(TimeUnit::Millisecond)`   |
+| `TIMESTAMP`   | `Timestamp(TimeUnit::Nanosecond)` |
+| `INTERVAL`    | _Not yet supported_               |
+| `REGCLASS`    | _Not yet supported_               |
+| `TEXT`        | _Not yet supported_               |
+| `BYTEA`       | _Not yet supported_               |
+| `CUSTOM`      | _Not yet supported_               |
+| `ARRAY`       | _Not yet supported_               |
diff --git a/datafusion/_static/scripts/pydata-sphinx-theme.js b/datafusion/_static/scripts/pydata-sphinx-theme.js
new file mode 100644
index 000000000000..0e00c4cad21e
--- /dev/null
+++ b/datafusion/_static/scripts/pydata-sphinx-theme.js
@@ -0,0 +1,32 @@
+!function(t){var e={};function n(i){if(e[i])return e[i].exports;var o=e[i]={i:i,l:!1,exports:{}};return t[i].call(o.exports,o,o.exports,n),o.l=!0,o.exports}n.m=t,n.c=e,n.d=function(t,e,i){n.o(t,e)||Object.defineProperty(t,e,{enumerable:!0,get:i})},n.r=function(t){"undefined"!=typeof Symbol&&Symbol.toStringTag&&Object.defineProperty(t,Symbol.toStringTag,{value:"Module"}),Object.defineProperty(t,"__esModule",{value:!0})},n.t=function(t,e){if(1&e&&(t=n(t)),8&e)return t;if(4&e&&"object"==typeof t&&t&&t.__esModule)return t;var i=Object.create(null);if(n.r(i),Object.defineProperty(i,"default",{enumerable:!0,value:t}),2&e&&"string"!=typeof t)for(var o in t)n.d(i,o,function(e){return t[e]}.bind(null,o));return i},n.n=function(t){var e=t&&t.__esModule?function(){return t.default}:function(){return t};return n.d(e,"a",e),e},n.o=function(t,e){return Object.prototype.hasOwnProperty.call(t,e)},n.p="",n(n.s=2)}([function(t,e){t.exports=jQuery},function(t,e,n){"use strict";n.r(e),function(t){
+/**!
+ * @fileOverview Kickass library to create and place poppers near their reference elements.
+ * @version 1.16.1
+ * @license
+ * Copyright (c) 2016 Federico Zivolo and contributors
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+var n="undefined"!=typeof window&&"undefined"!=typeof document&&"undefined"!=typeof navigator,i=function(){for(var t=["Edge","Trident","Firefox"],e=0;e<t.length;e+=1)if(n&&navigator.userAgent.indexOf(t[e])>=0)return 1;return 0}();var o=n&&window.Promise?function(t){var e=!1;return function(){e||(e=!0,window.Promise.resolve().then((function(){e=!1,t()})))}}:function(t){var e=!1;return function(){e||(e=!0,setTimeout((function(){e=!1,t()}),i))}};function r(t){return t&&"[object Function]"==={}.toString.call(t)}function a(t,e){if(1!==t.nodeType)return[];var n=t.ownerDocument.defaultView.getComputedStyle(t,null);return e?n[e]:n}function s(t){return"HTML"===t.nodeName?t:t.parentNode||t.host}function l(t){if(!t)return document.body;switch(t.nodeName){case"HTML":case"BODY":return t.ownerDocument.body;case"#document":return t.body}var e=a(t),n=e.overflow,i=e.overflowX,o=e.overflowY;return/(auto|scroll|overlay)/.test(n+o+i)?t:l(s(t))}function u(t){return t&&t.referenceNode?t.referenceNode:t}var 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+/*!
+  * Bootstrap v4.6.1 (https://getbootstrap.com/)
+  * Copyright 2011-2021 The Bootstrap Authors (https://github.com/twbs/bootstrap/graphs/contributors)
+  * Licensed under MIT (https://github.com/twbs/bootstrap/blob/main/LICENSE)
+  */
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e={relatedTarget:this._element},n=o.default.Event("hide.bs.dropdown",e),i=t._getParentFromElement(this._element);o.default(i).trigger(n),n.isDefaultPrevented()||(this._popper&&this._popper.destroy(),o.default(this._menu).toggleClass("show"),o.default(i).toggleClass("show").trigger(o.default.Event("hidden.bs.dropdown",e)))}},e.dispose=function(){o.default.removeData(this._element,"bs.dropdown"),o.default(this._element).off(".bs.dropdown"),this._element=null,this._menu=null,null!==this._popper&&(this._popper.destroy(),this._popper=null)},e.update=function(){this._inNavbar=this._detectNavbar(),null!==this._popper&&this._popper.scheduleUpdate()},e._addEventListeners=function(){var t=this;o.default(this._element).on("click.bs.dropdown",(function(e){e.preventDefault(),e.stopPropagation(),t.toggle()}))},e._getConfig=function(t){return t=l({},this.constructor.Default,o.default(this._element).data(),t),d.typeCheckConfig(k,t,this.constructor.DefaultType),t},e._getMenuElement=function(){if(!this._menu){var e=t._getParentFromElement(this._element);e&&(this._menu=e.querySelector(".dropdown-menu"))}return this._menu},e._getPlacement=function(){var t=o.default(this._element.parentNode),e="bottom-start";return t.hasClass("dropup")?e=o.default(this._menu).hasClass("dropdown-menu-right")?"top-end":"top-start":t.hasClass("dropright")?e="right-start":t.hasClass("dropleft")?e="left-start":o.default(this._menu).hasClass("dropdown-menu-right")&&(e="bottom-end"),e},e._detectNavbar=function(){return o.default(this._element).closest(".navbar").length>0},e._getOffset=function(){var t=this,e={};return"function"==typeof this._config.offset?e.fn=function(e){return e.offsets=l({},e.offsets,t._config.offset(e.offsets,t._element)),e}:e.offset=this._config.offset,e},e._getPopperConfig=function(){var t={placement:this._getPlacement(),modifiers:{offset:this._getOffset(),flip:{enabled:this._config.flip},preventOverflow:{boundariesElement:this._config.boundary}}};return"static"===this._config.display&&(t.modifiers.applyStyle={enabled:!1}),l({},t,this._config.popperConfig)},t._jQueryInterface=function(e){return this.each((function(){var n=o.default(this).data("bs.dropdown");if(n||(n=new t(this,"object"==typeof e?e:null),o.default(this).data("bs.dropdown",n)),"string"==typeof e){if(void 0===n[e])throw new TypeError('No method named "'+e+'"');n[e]()}}))},t._clearMenus=function(e){if(!e||3!==e.which&&("keyup"!==e.type||9===e.which))for(var n=[].slice.call(document.querySelectorAll('[data-toggle="dropdown"]')),i=0,r=n.length;i<r;i++){var a=t._getParentFromElement(n[i]),s=o.default(n[i]).data("bs.dropdown"),l={relatedTarget:n[i]};if(e&&"click"===e.type&&(l.clickEvent=e),s){var u=s._menu;if(o.default(a).hasClass("show")&&!(e&&("click"===e.type&&/input|textarea/i.test(e.target.tagName)||"keyup"===e.type&&9===e.which)&&o.default.contains(a,e.target))){var f=o.default.Event("hide.bs.dropdown",l);o.default(a).trigger(f),f.isDefaultPrevented()||("ontouchstart"in document.documentElement&&o.default(document.body).children().off("mouseover",null,o.default.noop),n[i].setAttribute("aria-expanded","false"),s._popper&&s._popper.destroy(),o.default(u).removeClass("show"),o.default(a).removeClass("show").trigger(o.default.Event("hidden.bs.dropdown",l)))}}}},t._getParentFromElement=function(t){var e,n=d.getSelectorFromElement(t);return n&&(e=document.querySelector(n)),e||t.parentNode},t._dataApiKeydownHandler=function(e){if(!(/input|textarea/i.test(e.target.tagName)?32===e.which||27!==e.which&&(40!==e.which&&38!==e.which||o.default(e.target).closest(".dropdown-menu").length):!I.test(e.which))&&!this.disabled&&!o.default(this).hasClass("disabled")){var n=t._getParentFromElement(this),i=o.default(n).hasClass("show");if(i||27!==e.which){if(e.preventDefault(),e.stopPropagation(),!i||27===e.which||32===e.which)return 27===e.which&&o.default(n.querySelector('[data-toggle="dropdown"]')).trigger("focus"),void o.default(this).trigger("click");var r=[].slice.call(n.querySelectorAll(".dropdown-menu .dropdown-item:not(.disabled):not(:disabled)")).filter((function(t){return o.default(t).is(":visible")}));if(0!==r.length){var a=r.indexOf(e.target);38===e.which&&a>0&&a--,40===e.which&&a<r.length-1&&a++,a<0&&(a=0),r[a].focus()}}}},s(t,null,[{key:"VERSION",get:function(){return"4.6.1"}},{key:"Default",get:function(){return O}},{key:"DefaultType",get:function(){return x}}]),t}();o.default(document).on("keydown.bs.dropdown.data-api",'[data-toggle="dropdown"]',j._dataApiKeydownHandler).on("keydown.bs.dropdown.data-api",".dropdown-menu",j._dataApiKeydownHandler).on("click.bs.dropdown.data-api 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e=this;if(!this._isShown&&!this._isTransitioning){var n=o.default.Event("show.bs.modal",{relatedTarget:t});o.default(this._element).trigger(n),n.isDefaultPrevented()||(this._isShown=!0,o.default(this._element).hasClass("fade")&&(this._isTransitioning=!0),this._checkScrollbar(),this._setScrollbar(),this._adjustDialog(),this._setEscapeEvent(),this._setResizeEvent(),o.default(this._element).on("click.dismiss.bs.modal",'[data-dismiss="modal"]',(function(t){return e.hide(t)})),o.default(this._dialog).on("mousedown.dismiss.bs.modal",(function(){o.default(e._element).one("mouseup.dismiss.bs.modal",(function(t){o.default(t.target).is(e._element)&&(e._ignoreBackdropClick=!0)}))})),this._showBackdrop((function(){return e._showElement(t)})))}},e.hide=function(t){var e=this;if(t&&t.preventDefault(),this._isShown&&!this._isTransitioning){var n=o.default.Event("hide.bs.modal");if(o.default(this._element).trigger(n),this._isShown&&!n.isDefaultPrevented()){this._isShown=!1;var i=o.default(this._element).hasClass("fade");if(i&&(this._isTransitioning=!0),this._setEscapeEvent(),this._setResizeEvent(),o.default(document).off("focusin.bs.modal"),o.default(this._element).removeClass("show"),o.default(this._element).off("click.dismiss.bs.modal"),o.default(this._dialog).off("mousedown.dismiss.bs.modal"),i){var r=d.getTransitionDurationFromElement(this._element);o.default(this._element).one(d.TRANSITION_END,(function(t){return e._hideModal(t)})).emulateTransitionEnd(r)}else this._hideModal()}}},e.dispose=function(){[window,this._element,this._dialog].forEach((function(t){return o.default(t).off(".bs.modal")})),o.default(document).off("focusin.bs.modal"),o.default.removeData(this._element,"bs.modal"),this._config=null,this._element=null,this._dialog=null,this._backdrop=null,this._isShown=null,this._isBodyOverflowing=null,this._ignoreBackdropClick=null,this._isTransitioning=null,this._scrollbarWidth=null},e.handleUpdate=function(){this._adjustDialog()},e._getConfig=function(t){return t=l({},P,t),d.typeCheckConfig("modal",t,F),t},e._triggerBackdropTransition=function(){var t=this,e=o.default.Event("hidePrevented.bs.modal");if(o.default(this._element).trigger(e),!e.isDefaultPrevented()){var n=this._element.scrollHeight>document.documentElement.clientHeight;n||(this._element.style.overflowY="hidden"),this._element.classList.add("modal-static");var i=d.getTransitionDurationFromElement(this._dialog);o.default(this._element).off(d.TRANSITION_END),o.default(this._element).one(d.TRANSITION_END,(function(){t._element.classList.remove("modal-static"),n||o.default(t._element).one(d.TRANSITION_END,(function(){t._element.style.overflowY=""})).emulateTransitionEnd(t._element,i)})).emulateTransitionEnd(i),this._element.focus()}},e._showElement=function(t){var e=this,n=o.default(this._element).hasClass("fade"),i=this._dialog?this._dialog.querySelector(".modal-body"):null;this._element.parentNode&&this._element.parentNode.nodeType===Node.ELEMENT_NODE||document.body.appendChild(this._element),this._element.style.display="block",this._element.removeAttribute("aria-hidden"),this._element.setAttribute("aria-modal",!0),this._element.setAttribute("role","dialog"),o.default(this._dialog).hasClass("modal-dialog-scrollable")&&i?i.scrollTop=0:this._element.scrollTop=0,n&&d.reflow(this._element),o.default(this._element).addClass("show"),this._config.focus&&this._enforceFocus();var r=o.default.Event("shown.bs.modal",{relatedTarget:t}),a=function(){e._config.focus&&e._element.focus(),e._isTransitioning=!1,o.default(e._element).trigger(r)};if(n){var s=d.getTransitionDurationFromElement(this._dialog);o.default(this._dialog).one(d.TRANSITION_END,a).emulateTransitionEnd(s)}else a()},e._enforceFocus=function(){var t=this;o.default(document).off("focusin.bs.modal").on("focusin.bs.modal",(function(e){document!==e.target&&t._element!==e.target&&0===o.default(t._element).has(e.target).length&&t._element.focus()}))},e._setEscapeEvent=function(){var t=this;this._isShown?o.default(this._element).on("keydown.dismiss.bs.modal",(function(e){t._config.keyboard&&27===e.which?(e.preventDefault(),t.hide()):t._config.keyboard||27!==e.which||t._triggerBackdropTransition()})):this._isShown||o.default(this._element).off("keydown.dismiss.bs.modal")},e._setResizeEvent=function(){var t=this;this._isShown?o.default(window).on("resize.bs.modal",(function(e){return t.handleUpdate(e)})):o.default(window).off("resize.bs.modal")},e._hideModal=function(){var t=this;this._element.style.display="none",this._element.setAttribute("aria-hidden",!0),this._element.removeAttribute("aria-modal"),this._element.removeAttribute("role"),this._isTransitioning=!1,this._showBackdrop((function(){o.default(document.body).removeClass("modal-open"),t._resetAdjustments(),t._resetScrollbar(),o.default(t._element).trigger("hidden.bs.modal")}))},e._removeBackdrop=function(){this._backdrop&&(o.default(this._backdrop).remove(),this._backdrop=null)},e._showBackdrop=function(t){var e=this,n=o.default(this._element).hasClass("fade")?"fade":"";if(this._isShown&&this._config.backdrop){if(this._backdrop=document.createElement("div"),this._backdrop.className="modal-backdrop",n&&this._backdrop.classList.add(n),o.default(this._backdrop).appendTo(document.body),o.default(this._element).on("click.dismiss.bs.modal",(function(t){e._ignoreBackdropClick?e._ignoreBackdropClick=!1:t.target===t.currentTarget&&("static"===e._config.backdrop?e._triggerBackdropTransition():e.hide())})),n&&d.reflow(this._backdrop),o.default(this._backdrop).addClass("show"),!t)return;if(!n)return void t();var i=d.getTransitionDurationFromElement(this._backdrop);o.default(this._backdrop).one(d.TRANSITION_END,t).emulateTransitionEnd(i)}else if(!this._isShown&&this._backdrop){o.default(this._backdrop).removeClass("show");var r=function(){e._removeBackdrop(),t&&t()};if(o.default(this._element).hasClass("fade")){var a=d.getTransitionDurationFromElement(this._backdrop);o.default(this._backdrop).one(d.TRANSITION_END,r).emulateTransitionEnd(a)}else r()}else t&&t()},e._adjustDialog=function(){var t=this._element.scrollHeight>document.documentElement.clientHeight;!this._isBodyOverflowing&&t&&(this._element.style.paddingLeft=this._scrollbarWidth+"px"),this._isBodyOverflowing&&!t&&(this._element.style.paddingRight=this._scrollbarWidth+"px")},e._resetAdjustments=function(){this._element.style.paddingLeft="",this._element.style.paddingRight=""},e._checkScrollbar=function(){var t=document.body.getBoundingClientRect();this._isBodyOverflowing=Math.round(t.left+t.right)<window.innerWidth,this._scrollbarWidth=this._getScrollbarWidth()},e._setScrollbar=function(){var t=this;if(this._isBodyOverflowing){var e=[].slice.call(document.querySelectorAll(".fixed-top, .fixed-bottom, .is-fixed, .sticky-top")),n=[].slice.call(document.querySelectorAll(".sticky-top"));o.default(e).each((function(e,n){var i=n.style.paddingRight,r=o.default(n).css("padding-right");o.default(n).data("padding-right",i).css("padding-right",parseFloat(r)+t._scrollbarWidth+"px")})),o.default(n).each((function(e,n){var i=n.style.marginRight,r=o.default(n).css("margin-right");o.default(n).data("margin-right",i).css("margin-right",parseFloat(r)-t._scrollbarWidth+"px")}));var i=document.body.style.paddingRight,r=o.default(document.body).css("padding-right");o.default(document.body).data("padding-right",i).css("padding-right",parseFloat(r)+this._scrollbarWidth+"px")}o.default(document.body).addClass("modal-open")},e._resetScrollbar=function(){var t=[].slice.call(document.querySelectorAll(".fixed-top, .fixed-bottom, .is-fixed, .sticky-top"));o.default(t).each((function(t,e){var n=o.default(e).data("padding-right");o.default(e).removeData("padding-right"),e.style.paddingRight=n||""}));var e=[].slice.call(document.querySelectorAll(".sticky-top"));o.default(e).each((function(t,e){var 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s=[].slice.call(i.attributes),l=[].concat(e["*"]||[],e[a]||[]);s.forEach((function(t){(function(t,e){var n=t.nodeName.toLowerCase();if(-1!==e.indexOf(n))return-1===M.indexOf(n)||Boolean(H.test(t.nodeValue)||q.test(t.nodeValue));for(var i=e.filter((function(t){return t instanceof RegExp})),o=0,r=i.length;o<r;o++)if(i[o].test(n))return!0;return!1})(t,l)||i.removeAttribute(t.nodeName)}))},s=0,l=r.length;s<l;s++)a(s);return i.body.innerHTML}var W="tooltip",U=o.default.fn[W],V=new RegExp("(^|\\s)bs-tooltip\\S+","g"),Y=["sanitize","whiteList","sanitizeFn"],z={AUTO:"auto",TOP:"top",RIGHT:"right",BOTTOM:"bottom",LEFT:"left"},K={animation:!0,template:'<div class="tooltip" role="tooltip"><div class="arrow"></div><div class="tooltip-inner"></div></div>',trigger:"hover 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this._leave(null,this);this._enter(null,this)}},e.dispose=function(){clearTimeout(this._timeout),o.default.removeData(this.element,this.constructor.DATA_KEY),o.default(this.element).off(this.constructor.EVENT_KEY),o.default(this.element).closest(".modal").off("hide.bs.modal",this._hideModalHandler),this.tip&&o.default(this.tip).remove(),this._isEnabled=null,this._timeout=null,this._hoverState=null,this._activeTrigger=null,this._popper&&this._popper.destroy(),this._popper=null,this.element=null,this.config=null,this.tip=null},e.show=function(){var t=this;if("none"===o.default(this.element).css("display"))throw new Error("Please use show on visible elements");var e=o.default.Event(this.constructor.Event.SHOW);if(this.isWithContent()&&this._isEnabled){o.default(this.element).trigger(e);var n=d.findShadowRoot(this.element),i=o.default.contains(null!==n?n:this.element.ownerDocument.documentElement,this.element);if(e.isDefaultPrevented()||!i)return;var 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diff --git a/datafusion/_static/styles/pydata-sphinx-theme.css b/datafusion/_static/styles/pydata-sphinx-theme.css
new file mode 100644
index 000000000000..c39ccf7a3cb9
--- /dev/null
+++ b/datafusion/_static/styles/pydata-sphinx-theme.css
@@ -0,0 +1,6 @@
+/*!
+ * Bootstrap v4.6.1 (https://getbootstrap.com/)
+ * Copyright 2011-2021 The Bootstrap Authors
+ * Copyright 2011-2021 Twitter, Inc.
+ * Licensed under MIT (https://github.com/twbs/bootstrap/blob/main/LICENSE)
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.navbar-nav>.active>.nav-link{font-weight:600;color:rgba(var(--pst-color-navbar-link-active),1)}.navbar-header a{padding:0 15px}.admonition,div.admonition{margin:1.5625em auto;padding:0 .6rem .8rem;overflow:hidden;page-break-inside:avoid;border-left:.2rem solid;border-left-color:rgba(var(--pst-color-admonition-default),1);border-bottom-color:rgba(var(--pst-color-admonition-default),1);border-right-color:rgba(var(--pst-color-admonition-default),1);border-top-color:rgba(var(--pst-color-admonition-default),1);border-radius:.2rem;box-shadow:0 .2rem .5rem rgba(0,0,0,.05),0 0 .0625rem rgba(0,0,0,.1);transition:color .25s,background-color .25s,border-color .25s}.admonition :last-child,div.admonition :last-child{margin-bottom:0}.admonition p.admonition-title~*,div.admonition p.admonition-title~*{margin-left:1.4rem;margin-right:1.4rem}.admonition>ol,.admonition>ul,div.admonition>ol,div.admonition>ul{margin-left:1em}.admonition>.admonition-title,div.admonition>.admonition-title{position:relative;margin:0 -.6rem;padding:.4rem .6rem .4rem 2rem;font-weight:700;background-color:rgba(var(--pst-color-admonition-default),.1)}.admonition>.admonition-title:before,div.admonition>.admonition-title:before{position:absolute;left:.6rem;width:1rem;height:1rem;color:rgba(var(--pst-color-admonition-default),1);font-family:Font Awesome\ 5 Free;font-weight:900;content:var(--pst-icon-admonition-default)}.admonition>.admonition-title+*,div.admonition>.admonition-title+*{margin-top:.4em}.admonition.attention,div.admonition.attention{border-color:rgba(var(--pst-color-admonition-attention),1)}.admonition.attention>.admonition-title,div.admonition.attention>.admonition-title{background-color:rgba(var(--pst-color-admonition-attention),.1)}.admonition.attention>.admonition-title:before,div.admonition.attention>.admonition-title:before{color:rgba(var(--pst-color-admonition-attention),1);content:var(--pst-icon-admonition-attention)}.admonition.caution,div.admonition.caution{border-color:rgba(var(--pst-color-admonition-caution),1)}.admonition.caution>.admonition-title,div.admonition.caution>.admonition-title{background-color:rgba(var(--pst-color-admonition-caution),.1)}.admonition.caution>.admonition-title:before,div.admonition.caution>.admonition-title:before{color:rgba(var(--pst-color-admonition-caution),1);content:var(--pst-icon-admonition-caution)}.admonition.warning,div.admonition.warning{border-color:rgba(var(--pst-color-admonition-warning),1)}.admonition.warning>.admonition-title,div.admonition.warning>.admonition-title{background-color:rgba(var(--pst-color-admonition-warning),.1)}.admonition.warning>.admonition-title:before,div.admonition.warning>.admonition-title:before{color:rgba(var(--pst-color-admonition-warning),1);content:var(--pst-icon-admonition-warning)}.admonition.danger,div.admonition.danger{border-color:rgba(var(--pst-color-admonition-danger),1)}.admonition.danger>.admonition-title,div.admonition.danger>.admonition-title{background-color:rgba(var(--pst-color-admonition-danger),.1)}.admonition.danger>.admonition-title:before,div.admonition.danger>.admonition-title:before{color:rgba(var(--pst-color-admonition-danger),1);content:var(--pst-icon-admonition-danger)}.admonition.error,div.admonition.error{border-color:rgba(var(--pst-color-admonition-error),1)}.admonition.error>.admonition-title,div.admonition.error>.admonition-title{background-color:rgba(var(--pst-color-admonition-error),.1)}.admonition.error>.admonition-title:before,div.admonition.error>.admonition-title:before{color:rgba(var(--pst-color-admonition-error),1);content:var(--pst-icon-admonition-error)}.admonition.hint,div.admonition.hint{border-color:rgba(var(--pst-color-admonition-hint),1)}.admonition.hint>.admonition-title,div.admonition.hint>.admonition-title{background-color:rgba(var(--pst-color-admonition-hint),.1)}.admonition.hint>.admonition-title:before,div.admonition.hint>.admonition-title:before{color:rgba(var(--pst-color-admonition-hint),1);content:var(--pst-icon-admonition-hint)}.admonition.tip,div.admonition.tip{border-color:rgba(var(--pst-color-admonition-tip),1)}.admonition.tip>.admonition-title,div.admonition.tip>.admonition-title{background-color:rgba(var(--pst-color-admonition-tip),.1)}.admonition.tip>.admonition-title:before,div.admonition.tip>.admonition-title:before{color:rgba(var(--pst-color-admonition-tip),1);content:var(--pst-icon-admonition-tip)}.admonition.important,div.admonition.important{border-color:rgba(var(--pst-color-admonition-important),1)}.admonition.important>.admonition-title,div.admonition.important>.admonition-title{background-color:rgba(var(--pst-color-admonition-important),.1)}.admonition.important>.admonition-title:before,div.admonition.important>.admonition-title:before{color:rgba(var(--pst-color-admonition-important),1);content:var(--pst-icon-admonition-important)}.admonition.note,div.admonition.note{border-color:rgba(var(--pst-color-admonition-note),1)}.admonition.note>.admonition-title,div.admonition.note>.admonition-title{background-color:rgba(var(--pst-color-admonition-note),.1)}.admonition.note>.admonition-title:before,div.admonition.note>.admonition-title:before{color:rgba(var(--pst-color-admonition-note),1);content:var(--pst-icon-admonition-note)}table.field-list{border-collapse:separate;border-spacing:10px;margin-left:1px}table.field-list th.field-name{padding:1px 8px 1px 5px;white-space:nowrap;background-color:#eee}table.field-list td.field-body p{font-style:italic}table.field-list td.field-body p>strong{font-style:normal}table.field-list td.field-body blockquote{border-left:none;margin:0 0 .3em;padding-left:30px}.table.autosummary td:first-child{white-space:nowrap}.sig{font-family:var(--pst-font-family-monospace)}.sig-inline.c-texpr,.sig-inline.cpp-texpr{font-family:unset}.sig.c .k,.sig.c .kt,.sig.c .m,.sig.c .s,.sig.c .sc,.sig.cpp .k,.sig.cpp .kt,.sig.cpp .m,.sig.cpp .s,.sig.cpp .sc{color:rgba(var(--pst-color-text-base),1)}.sig-name{color:rgba(var(--pst-color-inline-code),1)}td.text-align\:left,th.text-align\:left{text-align:left}td.text-align\:right,th.text-align\:right{text-align:right}td.text-align\:center,th.text-align\:center{text-align:center}div.deprecated,div.versionadded,div.versionchanged{vertical-align:middle;margin:1.5625em auto;padding:0 .6rem;overflow:hidden;page-break-inside:avoid;border-left:.2rem solid;border-left-color:rgba(var(--pst-color-versionmodified-default),1);border-bottom-color:rgba(var(--pst-color-versionmodified-default),1);border-right-color:rgba(var(--pst-color-versionmodified-default),1);border-top-color:rgba(var(--pst-color-versionmodified-default),1);border-radius:.2rem;box-shadow:0 .2rem .5rem rgba(0,0,0,.05),0 0 .0625rem rgba(0,0,0,.1);transition:color .25s,background-color .25s,border-color .25s;background-color:rgba(var(--pst-color-admonition-default),.1)}div.deprecated>p,div.versionadded>p,div.versionchanged>p{margin-bottom:.6rem;margin-top:.6rem}div.versionadded{border-color:rgba(var(--pst-color-versionmodified-added),1);background-color:rgba(var(--pst-color-versionmodified-added),.1)}div.versionchanged{border-color:rgba(var(--pst-color-versionmodified-changed),1);background-color:rgba(var(--pst-color-versionmodified-changed),.1)}div.deprecated{border-color:rgba(var(--pst-color-versionmodified-deprecated),1);background-color:rgba(var(--pst-color-versionmodified-deprecated),.1)}span.versionmodified{font-weight:700}span.versionmodified:before{font-style:normal;margin-right:.6rem;color:rgba(var(--pst-color-versionmodified-default),1);font-family:Font Awesome\ 5 Free;font-weight:900;content:var(--pst-icon-versionmodified-default)}span.versionmodified.added:before{color:rgba(var(--pst-color-versionmodified-added),1);content:var(--pst-icon-versionmodified-added)}span.versionmodified.changed:before{color:rgba(var(--pst-color-versionmodified-changed),1);content:var(--pst-icon-versionmodified-changed)}span.versionmodified.deprecated:before{color:rgba(var(--pst-color-versionmodified-deprecated),1);content:var(--pst-icon-versionmodified-deprecated)}blockquote{padding:0 1em;color:#6a737d;border-left:.25em solid #dfe2e5}dt.label>span.brackets:not(:only-child):before{content:"["}dt.label>span.brackets:not(:only-child):after{content:"]"}a.footnote-reference{vertical-align:super;font-size:small}.topic{background-color:#eee}.seealso dd{margin-top:0;margin-bottom:0}.viewcode-back{font-family:var(--pst-font-family-base)}.viewcode-block:target{background-color:#f4debf;border-top:1px solid #ac9;border-bottom:1px solid #ac9}span.guilabel{border:1px solid #7fbbe3;background:#e7f2fa;font-size:80%;font-weight:700;border-radius:4px;padding:2.4px 6px;margin:auto 2px}footer{width:100%;border-top:1px solid #ccc;padding:10px}footer .footer-item p{margin-bottom:0}.bd-search{position:relative;padding:1rem 15px;margin-right:-15px;margin-left:-15px}.bd-search .icon{position:absolute;color:#a4a6a7;left:25px;top:25px}.bd-search input{border-radius:0;border:0;border-bottom:1px solid #e5e5e5;padding-left:35px}.bd-toc{-ms-flex-order:2;order:2;height:calc(100vh - 2rem);overflow-y:auto}@supports (position:-webkit-sticky) or (position:sticky){.bd-toc{position:-webkit-sticky;position:sticky;top:calc(var(--pst-header-height) + 20px);height:calc(100vh - 5rem);overflow-y:auto}}.bd-toc .onthispage{color:#a4a6a7}.section-nav{padding-left:0;border-left:1px solid #eee;border-bottom:none}.section-nav ul{padding-left:1rem}.toc-entry,.toc-entry a{display:block}.toc-entry a{padding:.125rem 1.5rem;color:rgba(var(--pst-color-toc-link),1)}@media (min-width:1200px){.toc-entry a{padding-right:0}}.toc-entry a:hover{color:rgba(var(--pst-color-toc-link-hover),1);text-decoration:none}.bd-sidebar{padding-top:1em;overflow-y:auto;display:flex;flex-direction:column}@media (min-width:720px){.bd-sidebar{border-right:1px solid rgba(0,0,0,.1)}@supports (position:-webkit-sticky) or (position:sticky){.bd-sidebar{position:-webkit-sticky;position:sticky;top:calc(var(--pst-header-height) + 20px);z-index:1000;height:calc(100vh - var(--pst-header-height) - 20px)}}}.bd-sidebar.no-sidebar{border-right:0}.bd-sidebar .sidebar-end-items{margin-top:auto;margin-bottom:1em}.bd-links{padding-top:1rem;padding-bottom:1rem;margin-right:-15px;margin-left:-15px}@media (min-width:720px){.bd-links{display:block}}.bd-sidenav{display:none}.bd-content{padding-top:20px}.bd-content .section{max-width:100%}.bd-content .section table{display:block;overflow:auto}.bd-toc-link{display:block;padding:.25rem 1.5rem;font-weight:600;color:rgba(0,0,0,.65)}.bd-toc-link:hover{color:rgba(0,0,0,.85);text-decoration:none}.bd-toc-item.active{margin-bottom:1rem}.bd-toc-item.active:not(:first-child){margin-top:1rem}.bd-toc-item.active>.bd-toc-link{color:rgba(0,0,0,.85)}.bd-toc-item.active>.bd-toc-link:hover{background-color:transparent}.bd-toc-item.active>.bd-sidenav{display:block}nav.bd-links p.caption{font-size:var(--pst-sidebar-caption-font-size);text-transform:uppercase;font-weight:700;position:relative;margin-top:1.25em;margin-bottom:.5em;padding:0 1.5rem;color:rgba(var(--pst-color-sidebar-caption),1)}nav.bd-links p.caption:first-child{margin-top:0}.bd-sidebar .nav{font-size:var(--pst-sidebar-font-size)}.bd-sidebar .nav ul{list-style:none;padding:0 0 0 1.5rem}.bd-sidebar .nav li>a{display:block;padding:.25rem 1.5rem;color:rgba(var(--pst-color-sidebar-link),1)}.bd-sidebar .nav li>a:hover{color:rgba(var(--pst-color-sidebar-link-hover),1);text-decoration:none;background-color:transparent}.bd-sidebar .nav li>a.reference.external:after{font-family:Font Awesome\ 5 Free;font-weight:900;content:"\f35d";font-size:.75em;margin-left:.3em}.bd-sidebar .nav .active:hover>a,.bd-sidebar .nav .active>a{font-weight:600;color:rgba(var(--pst-color-sidebar-link-active),1)}.toc-h2{font-size:.85rem}.toc-h3{font-size:.75rem}.toc-h4{font-size:.65rem}.toc-entry>.nav-link.active{font-weight:600;color:#130654;color:rgba(var(--pst-color-toc-link-active),1);background-color:transparent;border-left:2px solid rgba(var(--pst-color-toc-link-active),1)}.nav-link:hover{border-style:none}#navbar-main-elements li.nav-item i{font-size:.7rem;padding-left:2px;vertical-align:middle}.bd-toc .nav .nav{display:none}.bd-toc .nav .nav.visible,.bd-toc .nav>.active>ul{display:block}.prev-next-area{margin:20px 0}.prev-next-area p{margin:0 .3em;line-height:1.3em}.prev-next-area i{font-size:1.2em}.prev-next-area a{display:flex;align-items:center;border:none;padding:10px;max-width:45%;overflow-x:hidden;color:rgba(0,0,0,.65);text-decoration:none}.prev-next-area a p.prev-next-title{color:rgba(var(--pst-color-link),1);font-weight:600;font-size:1.1em}.prev-next-area a:hover p.prev-next-title{text-decoration:underline}.prev-next-area a .prev-next-info{flex-direction:column;margin:0 .5em}.prev-next-area a .prev-next-info .prev-next-subtitle{text-transform:capitalize}.prev-next-area a.left-prev{float:left}.prev-next-area a.right-next{float:right}.prev-next-area a.right-next div.prev-next-info{text-align:right}.alert{padding-bottom:0}.alert-info a{color:#e83e8c}#navbar-icon-links i.fa,#navbar-icon-links i.fab,#navbar-icon-links i.far,#navbar-icon-links i.fas{vertical-align:middle;font-style:normal;font-size:1.5rem;line-height:1.25}#navbar-icon-links i.fa-github-square:before{color:#333}#navbar-icon-links i.fa-twitter-square:before{color:#55acee}#navbar-icon-links i.fa-gitlab:before{color:#548}#navbar-icon-links i.fa-bitbucket:before{color:#0052cc}#navbar-icon-links img.icon-link-image{height:1.5em}.tocsection{border-left:1px solid #eee;padding:.3rem 1.5rem}.tocsection i{padding-right:.5rem}.editthispage{padding-top:2rem}.editthispage a{color:var(--pst-color-sidebar-link-active)}.xr-wrap[hidden]{display:block!important}.toctree-checkbox{position:absolute;display:none}.toctree-checkbox~ul{display:none}.toctree-checkbox~label i{transform:rotate(0deg)}.toctree-checkbox:checked~ul{display:block}.toctree-checkbox:checked~label i{transform:rotate(180deg)}.bd-sidebar li{position:relative}.bd-sidebar label{position:absolute;top:0;right:0;height:30px;width:30px;cursor:pointer;display:flex;justify-content:center;align-items:center}.bd-sidebar label:hover{background:rgba(var(--pst-color-sidebar-expander-background-hover),1)}.bd-sidebar label i{display:inline-block;font-size:.75rem;text-align:center}.bd-sidebar label i:hover{color:rgba(var(--pst-color-sidebar-link-hover),1)}.bd-sidebar li.has-children>.reference{padding-right:30px}div.doctest>div.highlight span.gp,span.linenos,table.highlighttable td.linenos{user-select:none;-webkit-user-select:text;-webkit-user-select:none;-moz-user-select:none;-ms-user-select:none}.docutils.container{padding-left:unset;padding-right:unset}
\ No newline at end of file
diff --git a/datafusion/_static/styles/theme.css b/datafusion/_static/styles/theme.css
new file mode 100644
index 000000000000..22779d9659ab
--- /dev/null
+++ b/datafusion/_static/styles/theme.css
@@ -0,0 +1,134 @@
+/* Provided by Sphinx's 'basic' theme, and included in the final set of assets */
+@import "../basic.css";
+
+:root {
+  /*****************************************************************************
+  * Theme config
+  **/
+  --pst-header-height: 60px;
+
+  /*****************************************************************************
+  * Font size
+  **/
+  --pst-font-size-base: 15px; /* base font size - applied at body / html level */
+
+  /* heading font sizes */
+  --pst-font-size-h1: 36px;
+  --pst-font-size-h2: 32px;
+  --pst-font-size-h3: 26px;
+  --pst-font-size-h4: 21px;
+  --pst-font-size-h5: 18px;
+  --pst-font-size-h6: 16px;
+
+  /* smaller then heading font sizes*/
+  --pst-font-size-milli: 12px;
+
+  --pst-sidebar-font-size: 0.9em;
+  --pst-sidebar-caption-font-size: 0.9em;
+
+  /*****************************************************************************
+  * Font family
+  **/
+  /* These are adapted from https://systemfontstack.com/ */
+  --pst-font-family-base-system: -apple-system, BlinkMacSystemFont, Segoe UI,
+    "Helvetica Neue", Arial, sans-serif, Apple Color Emoji, Segoe UI Emoji,
+    Segoe UI Symbol;
+  --pst-font-family-monospace-system: "SFMono-Regular", Menlo, Consolas, Monaco,
+    Liberation Mono, Lucida Console, monospace;
+
+  --pst-font-family-base: var(--pst-font-family-base-system);
+  --pst-font-family-heading: var(--pst-font-family-base);
+  --pst-font-family-monospace: var(--pst-font-family-monospace-system);
+
+  /*****************************************************************************
+  * Color
+  *
+  * Colors are defined in rgb string way, "red, green, blue"
+  **/
+  --pst-color-primary: 19, 6, 84;
+  --pst-color-success: 40, 167, 69;
+  --pst-color-info: 0, 123, 255; /*23, 162, 184;*/
+  --pst-color-warning: 255, 193, 7;
+  --pst-color-danger: 220, 53, 69;
+  --pst-color-text-base: 51, 51, 51;
+
+  --pst-color-h1: var(--pst-color-primary);
+  --pst-color-h2: var(--pst-color-primary);
+  --pst-color-h3: var(--pst-color-text-base);
+  --pst-color-h4: var(--pst-color-text-base);
+  --pst-color-h5: var(--pst-color-text-base);
+  --pst-color-h6: var(--pst-color-text-base);
+  --pst-color-paragraph: var(--pst-color-text-base);
+  --pst-color-link: 0, 91, 129;
+  --pst-color-link-hover: 227, 46, 0;
+  --pst-color-headerlink: 198, 15, 15;
+  --pst-color-headerlink-hover: 255, 255, 255;
+  --pst-color-preformatted-text: 34, 34, 34;
+  --pst-color-preformatted-background: 250, 250, 250;
+  --pst-color-inline-code: 232, 62, 140;
+
+  --pst-color-active-navigation: 19, 6, 84;
+  --pst-color-navbar-link: 77, 77, 77;
+  --pst-color-navbar-link-hover: var(--pst-color-active-navigation);
+  --pst-color-navbar-link-active: var(--pst-color-active-navigation);
+  --pst-color-sidebar-link: 77, 77, 77;
+  --pst-color-sidebar-link-hover: var(--pst-color-active-navigation);
+  --pst-color-sidebar-link-active: var(--pst-color-active-navigation);
+  --pst-color-sidebar-expander-background-hover: 244, 244, 244;
+  --pst-color-sidebar-caption: 77, 77, 77;
+  --pst-color-toc-link: 119, 117, 122;
+  --pst-color-toc-link-hover: var(--pst-color-active-navigation);
+  --pst-color-toc-link-active: var(--pst-color-active-navigation);
+
+  /*****************************************************************************
+  * Icon
+  **/
+
+  /* font awesome icons*/
+  --pst-icon-check-circle: "\f058";
+  --pst-icon-info-circle: "\f05a";
+  --pst-icon-exclamation-triangle: "\f071";
+  --pst-icon-exclamation-circle: "\f06a";
+  --pst-icon-times-circle: "\f057";
+  --pst-icon-lightbulb: "\f0eb";
+
+  /*****************************************************************************
+  * Admonitions
+  **/
+
+  --pst-color-admonition-default: var(--pst-color-info);
+  --pst-color-admonition-note: var(--pst-color-info);
+  --pst-color-admonition-attention: var(--pst-color-warning);
+  --pst-color-admonition-caution: var(--pst-color-warning);
+  --pst-color-admonition-warning: var(--pst-color-warning);
+  --pst-color-admonition-danger: var(--pst-color-danger);
+  --pst-color-admonition-error: var(--pst-color-danger);
+  --pst-color-admonition-hint: var(--pst-color-success);
+  --pst-color-admonition-tip: var(--pst-color-success);
+  --pst-color-admonition-important: var(--pst-color-success);
+
+  --pst-icon-admonition-default: var(--pst-icon-info-circle);
+  --pst-icon-admonition-note: var(--pst-icon-info-circle);
+  --pst-icon-admonition-attention: var(--pst-icon-exclamation-circle);
+  --pst-icon-admonition-caution: var(--pst-icon-exclamation-triangle);
+  --pst-icon-admonition-warning: var(--pst-icon-exclamation-triangle);
+  --pst-icon-admonition-danger: var(--pst-icon-exclamation-triangle);
+  --pst-icon-admonition-error: var(--pst-icon-times-circle);
+  --pst-icon-admonition-hint: var(--pst-icon-lightbulb);
+  --pst-icon-admonition-tip: var(--pst-icon-lightbulb);
+  --pst-icon-admonition-important: var(--pst-icon-exclamation-circle);
+
+  /*****************************************************************************
+  * versionmodified
+  **/
+
+  --pst-color-versionmodified-default: var(--pst-color-info);
+  --pst-color-versionmodified-added: var(--pst-color-success);
+  --pst-color-versionmodified-changed: var(--pst-color-warning);
+  --pst-color-versionmodified-deprecated: var(--pst-color-danger);
+
+  --pst-icon-versionmodified-default: var(--pst-icon-exclamation-circle);
+  --pst-icon-versionmodified-added: var(--pst-icon-exclamation-circle);
+  --pst-icon-versionmodified-changed: var(--pst-icon-exclamation-circle);
+  --pst-icon-versionmodified-deprecated: var(--pst-icon-exclamation-circle);
+}
diff --git a/datafusion/_static/webpack-macros.html b/datafusion/_static/webpack-macros.html
index 144f1885904d..1fe5b473408e 100644
--- a/datafusion/_static/webpack-macros.html
+++ b/datafusion/_static/webpack-macros.html
@@ -1,25 +1,28 @@
-<!-- these macros are generated by "yarn build:production". do not edit by hand. -->
-{% macro head_pre_icons() %}
-  <link rel="stylesheet"
-    href="{{ pathto('_static/vendor/fontawesome/5.13.0/css/all.min.css', 1) }}">
-  <link rel="preload" as="font" type="font/woff2" crossorigin
-    href="{{ pathto('_static/vendor/fontawesome/5.13.0/webfonts/fa-solid-900.woff2', 1) }}">
-  <link rel="preload" as="font" type="font/woff2" crossorigin
-    href="{{ pathto('_static/vendor/fontawesome/5.13.0/webfonts/fa-brands-400.woff2', 1) }}">
-{% endmacro %}
+<!--
+    All these macros are auto-generated and must **NOT** be edited by hand.
+    See the webpack.config.js file, to learn more about how this is generated.
+  -->
+  {% macro head_pre_icons() %}
+    <link rel="stylesheet"
+      href="{{ pathto('_static/vendor/fontawesome/5.13.0/css/all.min.css', 1) }}">
+    <link rel="preload" as="font" type="font/woff2" crossorigin
+      href="{{ pathto('_static/vendor/fontawesome/5.13.0/webfonts/fa-solid-900.woff2', 1) }}">
+    <link rel="preload" as="font" type="font/woff2" crossorigin
+      href="{{ pathto('_static/vendor/fontawesome/5.13.0/webfonts/fa-brands-400.woff2', 1) }}">
+  {% endmacro %}
 
-{% macro head_pre_fonts() %}
-{% endmacro %}
+  {% macro head_pre_fonts() %}
+  {% endmacro %}
 
-{% macro head_pre_bootstrap() %}
-  <link href="{{ pathto('_static/css/theme.css', 1) }}" rel="stylesheet" />
-  <link href="{{ pathto('_static/css/index.c5995385ac14fb8791e8eb36b4908be2.css', 1) }}" rel="stylesheet" />
-{% endmacro %}
+  {% macro head_pre_bootstrap() %}
+    <link href="{{ pathto('_static/styles/theme.css', 1) }}?digest=1999514e3f237ded88cf" rel="stylesheet">
+<link href="{{ pathto('_static/styles/pydata-sphinx-theme.css', 1) }}?digest=1999514e3f237ded88cf" rel="stylesheet">
+  {% endmacro %}
 
-{% macro head_js_preload() %}
-  <link rel="preload" as="script" href="{{ pathto('_static/js/index.1c5a1a01449ed65a7b51.js', 1) }}">
-{% endmacro %}
+  {% macro head_js_preload() %}
+    <link rel="preload" as="script" href="{{ pathto('_static/scripts/pydata-sphinx-theme.js', 1) }}?digest=1999514e3f237ded88cf">
+  {% endmacro %}
 
-{% macro body_post() %}
-  <script src="{{ pathto('_static/js/index.1c5a1a01449ed65a7b51.js', 1) }}"></script>
-{% endmacro %}
\ No newline at end of file
+  {% macro body_post() %}
+    <script src="{{ pathto('_static/scripts/pydata-sphinx-theme.js', 1) }}?digest=1999514e3f237ded88cf"></script>
+  {% endmacro %}
\ No newline at end of file
diff --git a/datafusion/cli/index.html b/datafusion/cli/index.html
index 63b832ac87ad..a4678d6ebaa2 100644
--- a/datafusion/cli/index.html
+++ b/datafusion/cli/index.html
@@ -3,30 +3,31 @@
 
 <html xmlns="http://www.w3.org/1999/xhtml">
   <head>
-    <meta charset="utf-8" />
+    <meta charset="utf-8" /><meta name="generator" content="Docutils 0.17.1: http://docutils.sourceforge.net/" />
+
     <title>DataFusion Command-line &#8212; Arrow Datafusion  documentation</title>
     
-  <link href="../_static/css/theme.css" rel="stylesheet" />
-  <link href="../_static/css/index.c5995385ac14fb8791e8eb36b4908be2.css" rel="stylesheet" />
-
+    <link href="../_static/styles/theme.css?digest=1999514e3f237ded88cf" rel="stylesheet">
+<link href="../_static/styles/pydata-sphinx-theme.css?digest=1999514e3f237ded88cf" rel="stylesheet">
+  
     
-  <link rel="stylesheet"
-    href="../_static/vendor/fontawesome/5.13.0/css/all.min.css">
-  <link rel="preload" as="font" type="font/woff2" crossorigin
-    href="../_static/vendor/fontawesome/5.13.0/webfonts/fa-solid-900.woff2">
-  <link rel="preload" as="font" type="font/woff2" crossorigin
-    href="../_static/vendor/fontawesome/5.13.0/webfonts/fa-brands-400.woff2">
-
+    <link rel="stylesheet"
+      href="../_static/vendor/fontawesome/5.13.0/css/all.min.css">
+    <link rel="preload" as="font" type="font/woff2" crossorigin
+      href="../_static/vendor/fontawesome/5.13.0/webfonts/fa-solid-900.woff2">
+    <link rel="preload" as="font" type="font/woff2" crossorigin
+      href="../_static/vendor/fontawesome/5.13.0/webfonts/fa-brands-400.woff2">
+  
     
       
-
+  
     
-    <link rel="stylesheet" href="../_static/basic.css" type="text/css" />
+    <link rel="stylesheet" href="../_static/styles/pydata-sphinx-theme.css" type="text/css" />
     <link rel="stylesheet" href="../_static/pygments.css" type="text/css" />
     <link rel="stylesheet" type="text/css" href="../_static/theme_overrides.css" />
     
-  <link rel="preload" as="script" href="../_static/js/index.1c5a1a01449ed65a7b51.js">
-
+    <link rel="preload" as="script" href="../_static/scripts/pydata-sphinx-theme.js?digest=1999514e3f237ded88cf">
+  
     <script id="documentation_options" data-url_root="../" src="../_static/documentation_options.js"></script>
     <script src="../_static/jquery.js"></script>
     <script src="../_static/underscore.js"></script>
@@ -37,7 +38,10 @@
     <link rel="next" title="Introduction" href="../user-guide/introduction.html" />
     <link rel="prev" title="datafusion.functions" href="../python/generated/datafusion.functions.html" />
     <meta name="viewport" content="width=device-width, initial-scale=1" />
-    <meta name="docsearch:language" content="en" />
+    <meta name="docsearch:language" content="None">
+    
+
+    <!-- Google Analytics -->
     
   </head>
   <body data-spy="scroll" data-target="#bd-toc-nav" data-offset="80">
@@ -53,6 +57,7 @@
             
             <!-- Only show if we have sidebars configured, else just a small margin  -->
             <div class="col-12 col-md-3 bd-sidebar">
+              <div class="sidebar-start-items">
 <a class="navbar-brand" href="../index.html">
   <img src="../_static/images/DataFusion-Logo-Background-White.png" class="logo" alt="logo">
 </a>
@@ -65,7 +70,7 @@
 <nav class="bd-links" id="bd-docs-nav" aria-label="Main navigation">
   <div class="bd-toc-item active">
     
-    <p class="caption">
+    <p>
  <span class="caption-text">
   Supported Environments
  </span>
@@ -174,7 +179,7 @@
   </a>
  </li>
 </ul>
-<p class="caption">
+<p>
  <span class="caption-text">
   User Guide
  </span>
@@ -210,6 +215,11 @@
    </i>
   </label>
   <ul>
+   <li class="toctree-l2">
+    <a class="reference internal" href="../user-guide/sql/sql_status.html">
+     Status
+    </a>
+   </li>
    <li class="toctree-l2">
     <a class="reference internal" href="../user-guide/sql/select.html">
      SELECT syntax
@@ -314,7 +324,7 @@
   </a>
  </li>
 </ul>
-<p class="caption">
+<p>
  <span class="caption-text">
   Specification
  </span>
@@ -335,8 +345,13 @@
    Datafusion output field name semantic
   </a>
  </li>
+ <li class="toctree-l1">
+  <a class="reference internal" href="../specification/quarterly_roadmap.html">
+   Roadmap
+  </a>
+ </li>
 </ul>
-<p class="caption">
+<p>
  <span class="caption-text">
   README
  </span>
@@ -353,7 +368,7 @@
   </a>
  </li>
 </ul>
-<p class="caption">
+<p>
  <span class="caption-text">
   Community
  </span>
@@ -379,6 +394,9 @@
     
   </div>
 </nav>
+              </div>
+              <div class="sidebar-end-items">
+              </div>
             </div>
             
           
@@ -453,12 +471,12 @@
               
               <div>
                 
-  <div class="section" id="datafusion-command-line">
+  <section id="datafusion-command-line">
 <h1>DataFusion Command-line<a class="headerlink" href="#datafusion-command-line" title="Permalink to this headline">¶</a></h1>
 <p>The Arrow DataFusion CLI is a command-line interactive SQL utility that allows
 queries to be executed against CSV and Parquet files. It is a convenient way to
 try DataFusion out with your own data sources.</p>
-<div class="section" id="install-and-run-using-homebrew-on-macos">
+<section id="install-and-run-using-homebrew-on-macos">
 <h2>Install and run using Homebrew (on MacOS)<a class="headerlink" href="#install-and-run-using-homebrew-on-macos" title="Permalink to this headline">¶</a></h2>
 <p>The easiest way to give DataFusion CLI a spin is via Homebrew (on MacOS). Install it as any other pre-built software like this:</p>
 <div class="highlight-bash notranslate"><div class="highlight"><pre><span></span>brew install datafusion
@@ -473,8 +491,8 @@ <h2>Install and run using Homebrew (on MacOS)<a class="headerlink" href="#instal
 datafusion-cli
 </pre></div>
 </div>
-</div>
-<div class="section" id="run-using-cargo">
+</section>
+<section id="run-using-cargo">
 <h2>Run using Cargo<a class="headerlink" href="#run-using-cargo" title="Permalink to this headline">¶</a></h2>
 <p>Use the following commands to clone this repository and run the CLI. This will require the Rust toolchain to be installed. Rust can be installed from <a class="reference external" href="https://rustup.rs/">https://rustup.rs</a>.</p>
 <div class="highlight-bash notranslate"><div class="highlight"><pre><span></span>git clone https://github.com/apache/arrow-datafusion
@@ -482,8 +500,8 @@ <h2>Run using Cargo<a class="headerlink" href="#run-using-cargo" title="Permalin
 cargo run --release
 </pre></div>
 </div>
-</div>
-<div class="section" id="run-using-docker">
+</section>
+<section id="run-using-docker">
 <h2>Run using Docker<a class="headerlink" href="#run-using-docker" title="Permalink to this headline">¶</a></h2>
 <p>Use the following commands to clone this repository and build a Docker image containing the CLI tool. Note that there is <code class="code docutils literal notranslate"><span class="pre">.dockerignore</span></code> file in the root of the repository that may need to be deleted in order for this to work.</p>
 <div class="highlight-bash notranslate"><div class="highlight"><pre><span></span>git clone https://github.com/apache/arrow-datafusion
@@ -492,8 +510,8 @@ <h2>Run using Docker<a class="headerlink" href="#run-using-docker" title="Permal
 docker run -it -v <span class="k">$(</span>your_data_location<span class="k">)</span>:/data datafusion-cli
 </pre></div>
 </div>
-</div>
-<div class="section" id="usage">
+</section>
+<section id="usage">
 <h2>Usage<a class="headerlink" href="#usage" title="Permalink to this headline">¶</a></h2>
 <div class="highlight-bash notranslate"><div class="highlight"><pre><span></span>DataFusion <span class="m">5</span>.1.0-SNAPSHOT
 DataFusion is an <span class="k">in</span>-memory query engine that uses Apache Arrow as the memory model. It supports executing SQL queries
@@ -517,8 +535,8 @@ <h2>Usage<a class="headerlink" href="#usage" title="Permalink to this headline">
 </pre></div>
 </div>
 <p>Type <cite>exit</cite> or <cite>quit</cite> to exit the CLI.</p>
-</div>
-<div class="section" id="registering-parquet-data-sources">
+</section>
+<section id="registering-parquet-data-sources">
 <h2>Registering Parquet Data Sources<a class="headerlink" href="#registering-parquet-data-sources" title="Permalink to this headline">¶</a></h2>
 <p>Parquet data sources can be registered by executing a <code class="code docutils literal notranslate"><span class="pre">CREATE</span> <span class="pre">EXTERNAL</span> <span class="pre">TABLE</span></code> SQL statement. It is not necessary to provide schema information for Parquet files.</p>
 <div class="highlight-sql notranslate"><div class="highlight"><pre><span></span><span class="k">CREATE</span> <span class="k">EXTERNAL</span> <span class="k">TABLE</span> <span class="n">taxi</span>
@@ -526,8 +544,8 @@ <h2>Registering Parquet Data Sources<a class="headerlink" href="#registering-par
 <span class="k">LOCATION</span> <span class="s1">&#39;/mnt/nyctaxi/tripdata.parquet&#39;</span><span class="p">;</span>
 </pre></div>
 </div>
-</div>
-<div class="section" id="registering-csv-data-sources">
+</section>
+<section id="registering-csv-data-sources">
 <h2>Registering CSV Data Sources<a class="headerlink" href="#registering-csv-data-sources" title="Permalink to this headline">¶</a></h2>
 <p>CSV data sources can be registered by executing a <code class="code docutils literal notranslate"><span class="pre">CREATE</span> <span class="pre">EXTERNAL</span> <span class="pre">TABLE</span></code> SQL statement. It is necessary to provide schema information for CSV files since DataFusion does not automatically infer the schema when using SQL to query CSV files.</p>
 <div class="highlight-sql notranslate"><div class="highlight"><pre><span></span><span class="k">CREATE</span> <span class="k">EXTERNAL</span> <span class="k">TABLE</span> <span class="n">test</span> <span class="p">(</span>
@@ -550,19 +568,30 @@ <h2>Registering CSV Data Sources<a class="headerlink" href="#registering-csv-dat
 <span class="k">LOCATION</span> <span class="s1">&#39;/path/to/aggregate_test_100.csv&#39;</span><span class="p">;</span>
 </pre></div>
 </div>
-</div>
-</div>
+</section>
+</section>
 
 
               </div>
               
               
-              <div class='prev-next-bottom'>
-                
-    <a class='left-prev' id="prev-link" href="../python/generated/datafusion.functions.html" title="previous page">datafusion.functions</a>
-    <a class='right-next' id="next-link" href="../user-guide/introduction.html" title="next page">Introduction</a>
-
-              </div>
+              <!-- Previous / next buttons -->
+<div class='prev-next-area'>
+    <a class='left-prev' id="prev-link" href="../python/generated/datafusion.functions.html" title="previous page">
+        <i class="fas fa-angle-left"></i>
+        <div class="prev-next-info">
+            <p class="prev-next-subtitle">previous</p>
+            <p class="prev-next-title">datafusion.functions</p>
+        </div>
+    </a>
+    <a class='right-next' id="next-link" href="../user-guide/introduction.html" title="next page">
+    <div class="prev-next-info">
+        <p class="prev-next-subtitle">next</p>
+        <p class="prev-next-title">Introduction</p>
+    </div>
+    <i class="fas fa-angle-right"></i>
+    </a>
+</div>
               
           </main>
           
@@ -570,20 +599,19 @@ <h2>Registering CSV Data Sources<a class="headerlink" href="#registering-csv-dat
       </div>
     </div>
   
-  <script src="../_static/js/index.1c5a1a01449ed65a7b51.js"></script>
-
+    <script src="../_static/scripts/pydata-sphinx-theme.js?digest=1999514e3f237ded88cf"></script>
   <footer class="footer mt-5 mt-md-0">
   <div class="container">
     
     <div class="footer-item">
       <p class="copyright">
-    &copy; Copyright 2021, Apache Software Foundation.<br/>
+    &copy; Copyright 2021, Apache Software Foundation.<br>
 </p>
     </div>
     
     <div class="footer-item">
       <p class="sphinx-version">
-Created using <a href="http://sphinx-doc.org/">Sphinx</a> 2.4.4.<br/>
+Created using <a href="http://sphinx-doc.org/">Sphinx</a> 2.4.4.<br>
 </p>
     </div>
     
diff --git a/datafusion/community/communication.html b/datafusion/community/communication.html
index f06b9780644e..b7fef4e4d97b 100644
--- a/datafusion/community/communication.html
+++ b/datafusion/community/communication.html
@@ -3,30 +3,31 @@
 
 <html xmlns="http://www.w3.org/1999/xhtml">
   <head>
-    <meta charset="utf-8" />
+    <meta charset="utf-8" /><meta name="generator" content="Docutils 0.17.1: http://docutils.sourceforge.net/" />
+
     <title>Communication &#8212; Arrow Datafusion  documentation</title>
     
-  <link href="../_static/css/theme.css" rel="stylesheet" />
-  <link href="../_static/css/index.c5995385ac14fb8791e8eb36b4908be2.css" rel="stylesheet" />
-
+    <link href="../_static/styles/theme.css?digest=1999514e3f237ded88cf" rel="stylesheet">
+<link href="../_static/styles/pydata-sphinx-theme.css?digest=1999514e3f237ded88cf" rel="stylesheet">
+  
     
-  <link rel="stylesheet"
-    href="../_static/vendor/fontawesome/5.13.0/css/all.min.css">
-  <link rel="preload" as="font" type="font/woff2" crossorigin
-    href="../_static/vendor/fontawesome/5.13.0/webfonts/fa-solid-900.woff2">
-  <link rel="preload" as="font" type="font/woff2" crossorigin
-    href="../_static/vendor/fontawesome/5.13.0/webfonts/fa-brands-400.woff2">
-
+    <link rel="stylesheet"
+      href="../_static/vendor/fontawesome/5.13.0/css/all.min.css">
+    <link rel="preload" as="font" type="font/woff2" crossorigin
+      href="../_static/vendor/fontawesome/5.13.0/webfonts/fa-solid-900.woff2">
+    <link rel="preload" as="font" type="font/woff2" crossorigin
+      href="../_static/vendor/fontawesome/5.13.0/webfonts/fa-brands-400.woff2">
+  
     
       
-
+  
     
-    <link rel="stylesheet" href="../_static/basic.css" type="text/css" />
+    <link rel="stylesheet" href="../_static/styles/pydata-sphinx-theme.css" type="text/css" />
     <link rel="stylesheet" href="../_static/pygments.css" type="text/css" />
     <link rel="stylesheet" type="text/css" href="../_static/theme_overrides.css" />
     
-  <link rel="preload" as="script" href="../_static/js/index.1c5a1a01449ed65a7b51.js">
-
+    <link rel="preload" as="script" href="../_static/scripts/pydata-sphinx-theme.js?digest=1999514e3f237ded88cf">
+  
     <script id="documentation_options" data-url_root="../" src="../_static/documentation_options.js"></script>
     <script src="../_static/jquery.js"></script>
     <script src="../_static/underscore.js"></script>
@@ -34,9 +35,12 @@
     <script src="../_static/language_data.js"></script>
     <link rel="index" title="Index" href="../genindex.html" />
     <link rel="search" title="Search" href="../search.html" />
-    <link rel="prev" title="Datafusion output field name semantic" href="../specification/output-field-name-semantic.html" />
+    <link rel="prev" title="Roadmap" href="../specification/quarterly_roadmap.html" />
     <meta name="viewport" content="width=device-width, initial-scale=1" />
-    <meta name="docsearch:language" content="en" />
+    <meta name="docsearch:language" content="None">
+    
+
+    <!-- Google Analytics -->
     
   </head>
   <body data-spy="scroll" data-target="#bd-toc-nav" data-offset="80">
@@ -52,6 +56,7 @@
             
             <!-- Only show if we have sidebars configured, else just a small margin  -->
             <div class="col-12 col-md-3 bd-sidebar">
+              <div class="sidebar-start-items">
 <a class="navbar-brand" href="../index.html">
   <img src="../_static/images/DataFusion-Logo-Background-White.png" class="logo" alt="logo">
 </a>
@@ -64,7 +69,7 @@
 <nav class="bd-links" id="bd-docs-nav" aria-label="Main navigation">
   <div class="bd-toc-item active">
     
-    <p class="caption">
+    <p>
  <span class="caption-text">
   Supported Environments
  </span>
@@ -173,7 +178,7 @@
   </a>
  </li>
 </ul>
-<p class="caption">
+<p>
  <span class="caption-text">
   User Guide
  </span>
@@ -209,6 +214,11 @@
    </i>
   </label>
   <ul>
+   <li class="toctree-l2">
+    <a class="reference internal" href="../user-guide/sql/sql_status.html">
+     Status
+    </a>
+   </li>
    <li class="toctree-l2">
     <a class="reference internal" href="../user-guide/sql/select.html">
      SELECT syntax
@@ -313,7 +323,7 @@
   </a>
  </li>
 </ul>
-<p class="caption">
+<p>
  <span class="caption-text">
   Specification
  </span>
@@ -334,8 +344,13 @@
    Datafusion output field name semantic
   </a>
  </li>
+ <li class="toctree-l1">
+  <a class="reference internal" href="../specification/quarterly_roadmap.html">
+   Roadmap
+  </a>
+ </li>
 </ul>
-<p class="caption">
+<p>
  <span class="caption-text">
   README
  </span>
@@ -352,7 +367,7 @@
   </a>
  </li>
 </ul>
-<p class="caption">
+<p>
  <span class="caption-text">
   Community
  </span>
@@ -378,6 +393,9 @@
     
   </div>
 </nav>
+              </div>
+              <div class="sidebar-end-items">
+              </div>
             </div>
             
           
@@ -410,8 +428,8 @@
     </a>
    </li>
    <li class="toc-h3 nav-item toc-entry">
-    <a class="reference internal nav-link" href="#sync-up-zoom-calls">
-     Sync up Zoom calls
+    <a class="reference internal nav-link" href="#sync-up-video-calls">
+     Sync up video calls
     </a>
    </li>
   </ul>
@@ -467,16 +485,16 @@
   specific language governing permissions and limitations
   under the License.
 -->
-<div class="section" id="communication">
+<section id="communication">
 <h1>Communication<a class="headerlink" href="#communication" title="Permalink to this headline">¶</a></h1>
 <p>We welcome participation from everyone and encourage you to join us, ask
 questions, and get involved.</p>
 <p>All participation in the Apache Arrow DataFusion project is governed by the
 Apache Software Foundation’s <a class="reference external" href="https://www.apache.org/foundation/policies/conduct.html">code of
 conduct</a>.</p>
-<div class="section" id="questions">
+<section id="questions">
 <h2>Questions?<a class="headerlink" href="#questions" title="Permalink to this headline">¶</a></h2>
-<div class="section" id="mailing-list">
+<section id="mailing-list">
 <h3>Mailing list<a class="headerlink" href="#mailing-list" title="Permalink to this headline">¶</a></h3>
 <p>We use arrow.apache.org’s <code class="docutils literal notranslate"><span class="pre">dev&#64;</span></code> mailing list for project management, release
 coorindation and design discussions
@@ -486,8 +504,8 @@ <h3>Mailing list<a class="headerlink" href="#mailing-list" title="Permalink to t
 <p>When emailing the dev list, please make sure to prefix the subject line with a
 <code class="docutils literal notranslate"><span class="pre">[DataFusion]</span></code> tag, e.g. <code class="docutils literal notranslate"><span class="pre">&quot;[DataFusion]</span> <span class="pre">New</span> <span class="pre">API</span> <span class="pre">for</span> <span class="pre">remote</span> <span class="pre">data</span> <span class="pre">sources&quot;</span></code>, so
 that the appropriate people in the Apache Arrow community notice the message.</p>
-</div>
-<div class="section" id="slack-and-discord">
+</section>
+<section id="slack-and-discord">
 <h3>Slack and Discord<a class="headerlink" href="#slack-and-discord" title="Permalink to this headline">¶</a></h3>
 <p>We use the official <a class="reference external" href="https://s.apache.org/slack-invite">ASF</a> Slack workspace
 for informal discussions and coordination. This is a great place to meet other
@@ -497,13 +515,14 @@ <h3>Slack and Discord<a class="headerlink" href="#slack-and-discord" title="Perm
 server (<a class="reference external" href="https://discord.gg/Qw5gKqHxUM">invite link</a>) in case you are not able
 to join the Slack workspace. If you need an invite to the Slack workspace, you
 can also ask for one in our Discord server.</p>
-</div>
-<div class="section" id="sync-up-zoom-calls">
-<h3>Sync up Zoom calls<a class="headerlink" href="#sync-up-zoom-calls" title="Permalink to this headline">¶</a></h3>
-<p>We have biweekly sync calls every other Thursdays at 16:00 UTC
-(starting September 30, 2021) on Zoom <a class="reference external" href="https://influxdata.zoom.us/j/94666921249">Meeting Link</a></p>
-<p>The<a class="reference external" href="https://docs.google.com/document/d/1atCVnoff5SR4eM4Lwf2M1BBJTY6g3_HUNR6qswYJW_U/edit">agenda</a>
-is available if you would like to add a topic for discussion or see what is planned.</p>
+</section>
+<section id="sync-up-video-calls">
+<h3>Sync up video calls<a class="headerlink" href="#sync-up-video-calls" title="Permalink to this headline">¶</a></h3>
+<p>We have biweekly sync calls every other Thursdays at both 04:00 UTC
+and 16:00 UTC (starting September 30, 2021) depending on if there are
+items on the agenda to discuss and someone being willing to host.</p>
+<p>Please see the <a class="reference external" href="https://docs.google.com/document/d/1atCVnoff5SR4eM4Lwf2M1BBJTY6g3_HUNR6qswYJW_U/edit">agenda</a>
+for the video call link, add topics and to see what others plan to discuss.</p>
 <p>The goals of these calls are:</p>
 <ol class="simple">
 <li><p>Help “put a face to the name” of some of other contributors we are working with</p></li>
@@ -511,31 +530,35 @@ <h3>Sync up Zoom calls<a class="headerlink" href="#sync-up-zoom-calls" title="Pe
 </ol>
 <p>No decisions are made on the call and anything of substance will be discussed on this mailing list or in github issues / google docs.</p>
 <p>We will send a summary of all sync ups to the dev&#64;arrow.apache.org mailing list.</p>
-</div>
-</div>
-<div class="section" id="contributing">
+</section>
+</section>
+<section id="contributing">
 <h2>Contributing<a class="headerlink" href="#contributing" title="Permalink to this headline">¶</a></h2>
 <p>Our source code is hosted on
 <a class="reference external" href="https://github.com/apache/arrow-datafusion">GitHub</a>. For developers new to
 the project, we have curated a
 <a class="reference external" href="https://github.com/apache/arrow-datafusion/issues?q=is%3Aissue+is%3Aopen+label%3A%22good+first+issue%22">good-first-issue</a>
-list to help you get started.</p>
+list to help you get started. You can find datafusion’s major designs in docs/source/specification.</p>
 <p>We use GitHub issues for maintaining a queue of development work and as the
 public record. We often use Google docs, Github issues and pull requests for
-quick and small design discussions. For major design change proposals, please
-make sure to send them to the dev list for more visibility.</p>
-</div>
-</div>
+quick and small design discussions. For major design change proposals, we encourage you to write a rfc.</p>
+</section>
+</section>
 
 
               </div>
               
               
-              <div class='prev-next-bottom'>
-                
-    <a class='left-prev' id="prev-link" href="../specification/output-field-name-semantic.html" title="previous page">Datafusion output field name semantic</a>
-
-              </div>
+              <!-- Previous / next buttons -->
+<div class='prev-next-area'>
+    <a class='left-prev' id="prev-link" href="../specification/quarterly_roadmap.html" title="previous page">
+        <i class="fas fa-angle-left"></i>
+        <div class="prev-next-info">
+            <p class="prev-next-subtitle">previous</p>
+            <p class="prev-next-title">Roadmap</p>
+        </div>
+    </a>
+</div>
               
           </main>
           
@@ -543,20 +566,19 @@ <h2>Contributing<a class="headerlink" href="#contributing" title="Permalink to t
       </div>
     </div>
   
-  <script src="../_static/js/index.1c5a1a01449ed65a7b51.js"></script>
-
+    <script src="../_static/scripts/pydata-sphinx-theme.js?digest=1999514e3f237ded88cf"></script>
   <footer class="footer mt-5 mt-md-0">
   <div class="container">
     
     <div class="footer-item">
       <p class="copyright">
-    &copy; Copyright 2021, Apache Software Foundation.<br/>
+    &copy; Copyright 2021, Apache Software Foundation.<br>
 </p>
     </div>
     
     <div class="footer-item">
       <p class="sphinx-version">
-Created using <a href="http://sphinx-doc.org/">Sphinx</a> 2.4.4.<br/>
+Created using <a href="http://sphinx-doc.org/">Sphinx</a> 2.4.4.<br>
 </p>
     </div>
     
diff --git a/datafusion/genindex.html b/datafusion/genindex.html
index 60ae287b0922..a42dfba5ecba 100644
--- a/datafusion/genindex.html
+++ b/datafusion/genindex.html
@@ -7,27 +7,27 @@
     <meta charset="utf-8" />
     <title>Index &#8212; Arrow Datafusion  documentation</title>
     
-  <link href="_static/css/theme.css" rel="stylesheet" />
-  <link href="_static/css/index.c5995385ac14fb8791e8eb36b4908be2.css" rel="stylesheet" />
-
+    <link href="_static/styles/theme.css?digest=1999514e3f237ded88cf" rel="stylesheet">
+<link href="_static/styles/pydata-sphinx-theme.css?digest=1999514e3f237ded88cf" rel="stylesheet">
+  
     
-  <link rel="stylesheet"
-    href="_static/vendor/fontawesome/5.13.0/css/all.min.css">
-  <link rel="preload" as="font" type="font/woff2" crossorigin
-    href="_static/vendor/fontawesome/5.13.0/webfonts/fa-solid-900.woff2">
-  <link rel="preload" as="font" type="font/woff2" crossorigin
-    href="_static/vendor/fontawesome/5.13.0/webfonts/fa-brands-400.woff2">
-
+    <link rel="stylesheet"
+      href="_static/vendor/fontawesome/5.13.0/css/all.min.css">
+    <link rel="preload" as="font" type="font/woff2" crossorigin
+      href="_static/vendor/fontawesome/5.13.0/webfonts/fa-solid-900.woff2">
+    <link rel="preload" as="font" type="font/woff2" crossorigin
+      href="_static/vendor/fontawesome/5.13.0/webfonts/fa-brands-400.woff2">
+  
     
       
-
+  
     
-    <link rel="stylesheet" href="_static/basic.css" type="text/css" />
+    <link rel="stylesheet" href="_static/styles/pydata-sphinx-theme.css" type="text/css" />
     <link rel="stylesheet" href="_static/pygments.css" type="text/css" />
     <link rel="stylesheet" type="text/css" href="_static/theme_overrides.css" />
     
-  <link rel="preload" as="script" href="_static/js/index.1c5a1a01449ed65a7b51.js">
-
+    <link rel="preload" as="script" href="_static/scripts/pydata-sphinx-theme.js?digest=1999514e3f237ded88cf">
+  
     <script id="documentation_options" data-url_root="./" src="_static/documentation_options.js"></script>
     <script src="_static/jquery.js"></script>
     <script src="_static/underscore.js"></script>
@@ -36,7 +36,10 @@
     <link rel="index" title="Index" href="#" />
     <link rel="search" title="Search" href="search.html" />
     <meta name="viewport" content="width=device-width, initial-scale=1" />
-    <meta name="docsearch:language" content="en" />
+    <meta name="docsearch:language" content="None">
+    
+
+    <!-- Google Analytics -->
     
   </head>
   <body data-spy="scroll" data-target="#bd-toc-nav" data-offset="80">
@@ -52,6 +55,7 @@
             
             <!-- Only show if we have sidebars configured, else just a small margin  -->
             <div class="col-12 col-md-3 bd-sidebar">
+              <div class="sidebar-start-items">
 <a class="navbar-brand" href="index.html">
   <img src="_static/images/DataFusion-Logo-Background-White.png" class="logo" alt="logo">
 </a>
@@ -64,7 +68,7 @@
 <nav class="bd-links" id="bd-docs-nav" aria-label="Main navigation">
   <div class="bd-toc-item active">
     
-    <p class="caption">
+    <p>
  <span class="caption-text">
   Supported Environments
  </span>
@@ -173,7 +177,7 @@
   </a>
  </li>
 </ul>
-<p class="caption">
+<p>
  <span class="caption-text">
   User Guide
  </span>
@@ -209,6 +213,11 @@
    </i>
   </label>
   <ul>
+   <li class="toctree-l2">
+    <a class="reference internal" href="user-guide/sql/sql_status.html">
+     Status
+    </a>
+   </li>
    <li class="toctree-l2">
     <a class="reference internal" href="user-guide/sql/select.html">
      SELECT syntax
@@ -313,7 +322,7 @@
   </a>
  </li>
 </ul>
-<p class="caption">
+<p>
  <span class="caption-text">
   Specification
  </span>
@@ -334,8 +343,13 @@
    Datafusion output field name semantic
   </a>
  </li>
+ <li class="toctree-l1">
+  <a class="reference internal" href="specification/quarterly_roadmap.html">
+   Roadmap
+  </a>
+ </li>
 </ul>
-<p class="caption">
+<p>
  <span class="caption-text">
   README
  </span>
@@ -352,7 +366,7 @@
   </a>
  </li>
 </ul>
-<p class="caption">
+<p>
  <span class="caption-text">
   Community
  </span>
@@ -378,6 +392,9 @@
     
   </div>
 </nav>
+              </div>
+              <div class="sidebar-end-items">
+              </div>
             </div>
             
           
@@ -417,7 +434,7 @@ <h1 id="index">Index</h1>
  | <a href="#S"><strong>S</strong></a>
  | <a href="#T"><strong>T</strong></a>
  | <a href="#U"><strong>U</strong></a>
- | <a href="#V"><strong>V</strong></a>
+ | <a href="#W"><strong>W</strong></a>
  
 </div>
 <h2 id="_">_</h2>
@@ -444,11 +461,15 @@ <h2 id="A">A</h2>
       <li><a href="python/generated/datafusion.DataFrame.html#datafusion.DataFrame.aggregate">aggregate() (datafusion.DataFrame method)</a>
 </li>
       <li><a href="python/generated/datafusion.Expression.html#datafusion.Expression.alias">alias() (datafusion.Expression method)</a>
+
+      <ul>
+        <li><a href="python/generated/datafusion.functions.html#datafusion.functions.alias">(in module datafusion.functions)</a>
 </li>
-      <li><a href="python/generated/datafusion.functions.html#datafusion.functions.approx_distinct">approx_distinct() (in module datafusion.functions)</a>
-</li>
+      </ul></li>
   </ul></td>
   <td style="width: 33%; vertical-align: top;"><ul>
+      <li><a href="python/generated/datafusion.functions.html#datafusion.functions.approx_distinct">approx_distinct() (in module datafusion.functions)</a>
+</li>
       <li><a href="python/generated/datafusion.functions.html#datafusion.functions.array">array() (in module datafusion.functions)</a>
 </li>
       <li><a href="python/generated/datafusion.functions.html#datafusion.functions.ascii">ascii() (in module datafusion.functions)</a>
@@ -487,12 +508,10 @@ <h2 id="C">C</h2>
 </li>
       <li><a href="python/generated/datafusion.functions.html#datafusion.functions.chr">chr() (in module datafusion.functions)</a>
 </li>
-      <li><a href="python/generated/datafusion.functions.html#datafusion.functions.col">col() (in module datafusion.functions)</a>
+      <li><a href="python/generated/datafusion.DataFrame.html#datafusion.DataFrame.collect">collect() (datafusion.DataFrame method)</a>
 </li>
   </ul></td>
   <td style="width: 33%; vertical-align: top;"><ul>
-      <li><a href="python/generated/datafusion.DataFrame.html#datafusion.DataFrame.collect">collect() (datafusion.DataFrame method)</a>
-</li>
       <li><a href="python/generated/datafusion.Expression.html#datafusion.Expression.column">column() (datafusion.Expression static method)</a>
 </li>
       <li><a href="python/generated/datafusion.functions.html#datafusion.functions.concat">concat() (in module datafusion.functions)</a>
@@ -553,8 +572,6 @@ <h2 id="F">F</h2>
 <h2 id="I">I</h2>
 <table style="width: 100%" class="indextable genindextable"><tr>
   <td style="width: 33%; vertical-align: top;"><ul>
-      <li><a href="python/generated/datafusion.functions.html#datafusion.functions.Volatility.immutable">immutable() (datafusion.functions.Volatility static method)</a>
-</li>
       <li><a href="python/generated/datafusion.functions.html#datafusion.functions.in_list">in_list() (in module datafusion.functions)</a>
 </li>
   </ul></td>
@@ -580,8 +597,6 @@ <h2 id="L">L</h2>
       <li><a href="python/generated/datafusion.functions.html#datafusion.functions.left">left() (in module datafusion.functions)</a>
 </li>
       <li><a href="python/generated/datafusion.DataFrame.html#datafusion.DataFrame.limit">limit() (datafusion.DataFrame method)</a>
-</li>
-      <li><a href="python/generated/datafusion.functions.html#datafusion.functions.lit">lit() (in module datafusion.functions)</a>
 </li>
       <li><a href="python/generated/datafusion.Expression.html#datafusion.Expression.literal">literal() (datafusion.Expression static method)</a>
 </li>
@@ -628,6 +643,10 @@ <h2 id="O">O</h2>
 <table style="width: 100%" class="indextable genindextable"><tr>
   <td style="width: 33%; vertical-align: top;"><ul>
       <li><a href="python/generated/datafusion.functions.html#datafusion.functions.octet_length">octet_length() (in module datafusion.functions)</a>
+</li>
+  </ul></td>
+  <td style="width: 33%; vertical-align: top;"><ul>
+      <li><a href="python/generated/datafusion.functions.html#datafusion.functions.order_by">order_by() (in module datafusion.functions)</a>
 </li>
   </ul></td>
 </tr></table>
@@ -636,6 +655,8 @@ <h2 id="R">R</h2>
 <table style="width: 100%" class="indextable genindextable"><tr>
   <td style="width: 33%; vertical-align: top;"><ul>
       <li><a href="python/generated/datafusion.functions.html#datafusion.functions.random">random() (in module datafusion.functions)</a>
+</li>
+      <li><a href="python/generated/datafusion.functions.html#datafusion.functions.regexp_match">regexp_match() (in module datafusion.functions)</a>
 </li>
       <li><a href="python/generated/datafusion.functions.html#datafusion.functions.regexp_replace">regexp_replace() (in module datafusion.functions)</a>
 </li>
@@ -700,8 +721,6 @@ <h2 id="S">S</h2>
       <li><a href="python/generated/datafusion.ExecutionContext.html#datafusion.ExecutionContext.sql">sql() (datafusion.ExecutionContext method)</a>
 </li>
       <li><a href="python/generated/datafusion.functions.html#datafusion.functions.sqrt">sqrt() (in module datafusion.functions)</a>
-</li>
-      <li><a href="python/generated/datafusion.functions.html#datafusion.functions.Volatility.stable">stable() (datafusion.functions.Volatility static method)</a>
 </li>
       <li><a href="python/generated/datafusion.functions.html#datafusion.functions.starts_with">starts_with() (in module datafusion.functions)</a>
 </li>
@@ -722,10 +741,12 @@ <h2 id="T">T</h2>
       <li><a href="python/generated/datafusion.ExecutionContext.html#datafusion.ExecutionContext.tables">tables() (datafusion.ExecutionContext method)</a>
 </li>
       <li><a href="python/generated/datafusion.functions.html#datafusion.functions.tan">tan() (in module datafusion.functions)</a>
+</li>
+      <li><a href="python/generated/datafusion.functions.html#datafusion.functions.to_hex">to_hex() (in module datafusion.functions)</a>
 </li>
   </ul></td>
   <td style="width: 33%; vertical-align: top;"><ul>
-      <li><a href="python/generated/datafusion.functions.html#datafusion.functions.to_hex">to_hex() (in module datafusion.functions)</a>
+      <li><a href="python/generated/datafusion.functions.html#datafusion.functions.to_timestamp">to_timestamp() (in module datafusion.functions)</a>
 </li>
       <li><a href="python/generated/datafusion.functions.html#datafusion.functions.translate">translate() (in module datafusion.functions)</a>
 </li>
@@ -739,25 +760,15 @@ <h2 id="T">T</h2>
 <h2 id="U">U</h2>
 <table style="width: 100%" class="indextable genindextable"><tr>
   <td style="width: 33%; vertical-align: top;"><ul>
-      <li><a href="python/generated/datafusion.functions.html#datafusion.functions.udaf">udaf() (in module datafusion.functions)</a>
-</li>
-  </ul></td>
-  <td style="width: 33%; vertical-align: top;"><ul>
-      <li><a href="python/generated/datafusion.functions.html#datafusion.functions.udf">udf() (in module datafusion.functions)</a>
-</li>
       <li><a href="python/generated/datafusion.functions.html#datafusion.functions.upper">upper() (in module datafusion.functions)</a>
 </li>
   </ul></td>
 </tr></table>
 
-<h2 id="V">V</h2>
+<h2 id="W">W</h2>
 <table style="width: 100%" class="indextable genindextable"><tr>
   <td style="width: 33%; vertical-align: top;"><ul>
-      <li><a href="python/generated/datafusion.functions.html#datafusion.functions.Volatility.volatile">volatile() (datafusion.functions.Volatility static method)</a>
-</li>
-  </ul></td>
-  <td style="width: 33%; vertical-align: top;"><ul>
-      <li><a href="python/generated/datafusion.functions.html#datafusion.functions.Volatility">Volatility (class in datafusion.functions)</a>
+      <li><a href="python/generated/datafusion.functions.html#datafusion.functions.window">window() (in module datafusion.functions)</a>
 </li>
   </ul></td>
 </tr></table>
@@ -767,10 +778,9 @@ <h2 id="V">V</h2>
               </div>
               
               
-              <div class='prev-next-bottom'>
-                
-
-              </div>
+              <!-- Previous / next buttons -->
+<div class='prev-next-area'>
+</div>
               
           </main>
           
@@ -778,20 +788,19 @@ <h2 id="V">V</h2>
       </div>
     </div>
   
-  <script src="_static/js/index.1c5a1a01449ed65a7b51.js"></script>
-
+    <script src="_static/scripts/pydata-sphinx-theme.js?digest=1999514e3f237ded88cf"></script>
   <footer class="footer mt-5 mt-md-0">
   <div class="container">
     
     <div class="footer-item">
       <p class="copyright">
-    &copy; Copyright 2021, Apache Software Foundation.<br/>
+    &copy; Copyright 2021, Apache Software Foundation.<br>
 </p>
     </div>
     
     <div class="footer-item">
       <p class="sphinx-version">
-Created using <a href="http://sphinx-doc.org/">Sphinx</a> 2.4.4.<br/>
+Created using <a href="http://sphinx-doc.org/">Sphinx</a> 2.4.4.<br>
 </p>
     </div>
     
diff --git a/datafusion/index.html b/datafusion/index.html
index 1a7fb4350c94..4f61c9318c84 100644
--- a/datafusion/index.html
+++ b/datafusion/index.html
@@ -3,30 +3,31 @@
 
 <html xmlns="http://www.w3.org/1999/xhtml">
   <head>
-    <meta charset="utf-8" />
+    <meta charset="utf-8" /><meta name="generator" content="Docutils 0.17.1: http://docutils.sourceforge.net/" />
+
     <title>Apache Arrow Datafusion &#8212; Arrow Datafusion  documentation</title>
     
-  <link href="_static/css/theme.css" rel="stylesheet" />
-  <link href="_static/css/index.c5995385ac14fb8791e8eb36b4908be2.css" rel="stylesheet" />
-
+    <link href="_static/styles/theme.css?digest=1999514e3f237ded88cf" rel="stylesheet">
+<link href="_static/styles/pydata-sphinx-theme.css?digest=1999514e3f237ded88cf" rel="stylesheet">
+  
     
-  <link rel="stylesheet"
-    href="_static/vendor/fontawesome/5.13.0/css/all.min.css">
-  <link rel="preload" as="font" type="font/woff2" crossorigin
-    href="_static/vendor/fontawesome/5.13.0/webfonts/fa-solid-900.woff2">
-  <link rel="preload" as="font" type="font/woff2" crossorigin
-    href="_static/vendor/fontawesome/5.13.0/webfonts/fa-brands-400.woff2">
-
+    <link rel="stylesheet"
+      href="_static/vendor/fontawesome/5.13.0/css/all.min.css">
+    <link rel="preload" as="font" type="font/woff2" crossorigin
+      href="_static/vendor/fontawesome/5.13.0/webfonts/fa-solid-900.woff2">
+    <link rel="preload" as="font" type="font/woff2" crossorigin
+      href="_static/vendor/fontawesome/5.13.0/webfonts/fa-brands-400.woff2">
+  
     
       
-
+  
     
-    <link rel="stylesheet" href="_static/basic.css" type="text/css" />
+    <link rel="stylesheet" href="_static/styles/pydata-sphinx-theme.css" type="text/css" />
     <link rel="stylesheet" href="_static/pygments.css" type="text/css" />
     <link rel="stylesheet" type="text/css" href="_static/theme_overrides.css" />
     
-  <link rel="preload" as="script" href="_static/js/index.1c5a1a01449ed65a7b51.js">
-
+    <link rel="preload" as="script" href="_static/scripts/pydata-sphinx-theme.js?digest=1999514e3f237ded88cf">
+  
     <script id="documentation_options" data-url_root="./" src="_static/documentation_options.js"></script>
     <script src="_static/jquery.js"></script>
     <script src="_static/underscore.js"></script>
@@ -36,7 +37,10 @@
     <link rel="search" title="Search" href="search.html" />
     <link rel="next" title="DataFusion in Python" href="python/index.html" />
     <meta name="viewport" content="width=device-width, initial-scale=1" />
-    <meta name="docsearch:language" content="en" />
+    <meta name="docsearch:language" content="None">
+    
+
+    <!-- Google Analytics -->
     
   </head>
   <body data-spy="scroll" data-target="#bd-toc-nav" data-offset="80">
@@ -52,6 +56,7 @@
             
             <!-- Only show if we have sidebars configured, else just a small margin  -->
             <div class="col-12 col-md-3 bd-sidebar">
+              <div class="sidebar-start-items">
 <a class="navbar-brand" href="#">
   <img src="_static/images/DataFusion-Logo-Background-White.png" class="logo" alt="logo">
 </a>
@@ -64,7 +69,7 @@
 <nav class="bd-links" id="bd-docs-nav" aria-label="Main navigation">
   <div class="bd-toc-item active">
     
-    <p class="caption">
+    <p>
  <span class="caption-text">
   Supported Environments
  </span>
@@ -173,7 +178,7 @@
   </a>
  </li>
 </ul>
-<p class="caption">
+<p>
  <span class="caption-text">
   User Guide
  </span>
@@ -209,6 +214,11 @@
    </i>
   </label>
   <ul>
+   <li class="toctree-l2">
+    <a class="reference internal" href="user-guide/sql/sql_status.html">
+     Status
+    </a>
+   </li>
    <li class="toctree-l2">
     <a class="reference internal" href="user-guide/sql/select.html">
      SELECT syntax
@@ -313,7 +323,7 @@
   </a>
  </li>
 </ul>
-<p class="caption">
+<p>
  <span class="caption-text">
   Specification
  </span>
@@ -334,8 +344,13 @@
    Datafusion output field name semantic
   </a>
  </li>
+ <li class="toctree-l1">
+  <a class="reference internal" href="specification/quarterly_roadmap.html">
+   Roadmap
+  </a>
+ </li>
 </ul>
-<p class="caption">
+<p>
  <span class="caption-text">
   README
  </span>
@@ -352,7 +367,7 @@
   </a>
  </li>
 </ul>
-<p class="caption">
+<p>
  <span class="caption-text">
   Community
  </span>
@@ -378,6 +393,9 @@
     
   </div>
 </nav>
+              </div>
+              <div class="sidebar-end-items">
+              </div>
             </div>
             
           
@@ -429,12 +447,12 @@
               
               <div>
                 
-  <div class="section" id="apache-arrow-datafusion">
+  <section id="apache-arrow-datafusion">
 <h1>Apache Arrow Datafusion<a class="headerlink" href="#apache-arrow-datafusion" title="Permalink to this headline">¶</a></h1>
-<div class="section" id="table-of-content">
+<section id="table-of-content">
 <h2>Table of content<a class="headerlink" href="#table-of-content" title="Permalink to this headline">¶</a></h2>
 <div class="toctree-wrapper compound" id="toc-usage">
-<p class="caption"><span class="caption-text">Supported Environments</span><a class="headerlink" href="#toc-usage" title="Permalink to this toctree">¶</a></p>
+<p><span class="caption-text">Supported Environments</span><a class="headerlink" href="#toc-usage" title="Permalink to this toctree">¶</a></p>
 <ul>
 <li class="toctree-l1"><a class="reference external" href="https://docs.rs/crate/datafusion/">Rust</a></li>
 <li class="toctree-l1"><a class="reference internal" href="python/index.html">Python</a></li>
@@ -442,7 +460,7 @@ <h2>Table of content<a class="headerlink" href="#table-of-content" title="Permal
 </ul>
 </div>
 <div class="toctree-wrapper compound" id="toc-guide">
-<p class="caption"><span class="caption-text">User Guide</span><a class="headerlink" href="#toc-guide" title="Permalink to this toctree">¶</a></p>
+<p><span class="caption-text">User Guide</span><a class="headerlink" href="#toc-guide" title="Permalink to this toctree">¶</a></p>
 <ul>
 <li class="toctree-l1"><a class="reference internal" href="user-guide/introduction.html">Introduction</a></li>
 <li class="toctree-l1"><a class="reference internal" href="user-guide/example-usage.html">Example Usage</a></li>
@@ -454,42 +472,48 @@ <h2>Table of content<a class="headerlink" href="#table-of-content" title="Permal
 </ul>
 </div>
 <div class="toctree-wrapper compound" id="toc-specs">
-<p class="caption"><span class="caption-text">Specification</span><a class="headerlink" href="#toc-specs" title="Permalink to this toctree">¶</a></p>
+<p><span class="caption-text">Specification</span><a class="headerlink" href="#toc-specs" title="Permalink to this toctree">¶</a></p>
 <ul>
 <li class="toctree-l1"><a class="reference internal" href="specification/roadmap.html">Roadmap</a></li>
 <li class="toctree-l1"><a class="reference internal" href="specification/roadmap.html#datafusion">DataFusion</a></li>
 <li class="toctree-l1"><a class="reference internal" href="specification/roadmap.html#ballista">Ballista</a></li>
 <li class="toctree-l1"><a class="reference internal" href="specification/invariants.html">DataFusion’s Invariants</a></li>
 <li class="toctree-l1"><a class="reference internal" href="specification/output-field-name-semantic.html">Datafusion output field name semantic</a></li>
+<li class="toctree-l1"><a class="reference internal" href="specification/quarterly_roadmap.html">Roadmap</a></li>
 </ul>
 </div>
 <div class="toctree-wrapper compound" id="toc-readme">
-<p class="caption"><span class="caption-text">README</span><a class="headerlink" href="#toc-readme" title="Permalink to this toctree">¶</a></p>
+<p><span class="caption-text">README</span><a class="headerlink" href="#toc-readme" title="Permalink to this toctree">¶</a></p>
 <ul>
 <li class="toctree-l1"><a class="reference external" href="https://github.com/apache/arrow-datafusion/blob/master/README.md">Datafusion</a></li>
 <li class="toctree-l1"><a class="reference external" href="https://github.com/apache/arrow-datafusion/tree/master/ballista/README.md">Ballista</a></li>
 </ul>
 </div>
 <div class="toctree-wrapper compound" id="toc-community">
-<p class="caption"><span class="caption-text">Community</span><a class="headerlink" href="#toc-community" title="Permalink to this toctree">¶</a></p>
+<p><span class="caption-text">Community</span><a class="headerlink" href="#toc-community" title="Permalink to this toctree">¶</a></p>
 <ul>
 <li class="toctree-l1"><a class="reference internal" href="community/communication.html">Communication</a></li>
 <li class="toctree-l1"><a class="reference external" href="https://github.com/apache/arrow-datafusion/issues">Issue tracker</a></li>
 <li class="toctree-l1"><a class="reference external" href="https://github.com/apache/arrow-datafusion/blob/master/CODE_OF_CONDUCT.md">Code of conduct</a></li>
 </ul>
 </div>
-</div>
-</div>
+</section>
+</section>
 
 
               </div>
               
               
-              <div class='prev-next-bottom'>
-                
-    <a class='right-next' id="next-link" href="python/index.html" title="next page">DataFusion in Python</a>
-
-              </div>
+              <!-- Previous / next buttons -->
+<div class='prev-next-area'>
+    <a class='right-next' id="next-link" href="python/index.html" title="next page">
+    <div class="prev-next-info">
+        <p class="prev-next-subtitle">next</p>
+        <p class="prev-next-title">DataFusion in Python</p>
+    </div>
+    <i class="fas fa-angle-right"></i>
+    </a>
+</div>
               
           </main>
           
@@ -497,20 +521,19 @@ <h2>Table of content<a class="headerlink" href="#table-of-content" title="Permal
       </div>
     </div>
   
-  <script src="_static/js/index.1c5a1a01449ed65a7b51.js"></script>
-
+    <script src="_static/scripts/pydata-sphinx-theme.js?digest=1999514e3f237ded88cf"></script>
   <footer class="footer mt-5 mt-md-0">
   <div class="container">
     
     <div class="footer-item">
       <p class="copyright">
-    &copy; Copyright 2021, Apache Software Foundation.<br/>
+    &copy; Copyright 2021, Apache Software Foundation.<br>
 </p>
     </div>
     
     <div class="footer-item">
       <p class="sphinx-version">
-Created using <a href="http://sphinx-doc.org/">Sphinx</a> 2.4.4.<br/>
+Created using <a href="http://sphinx-doc.org/">Sphinx</a> 2.4.4.<br>
 </p>
     </div>
     
diff --git a/datafusion/objects.inv b/datafusion/objects.inv
index 842645e007df..34c23e793832 100644
Binary files a/datafusion/objects.inv and b/datafusion/objects.inv differ
diff --git a/datafusion/py-modindex.html b/datafusion/py-modindex.html
index ebc4985a1e31..c004a03d2ac7 100644
--- a/datafusion/py-modindex.html
+++ b/datafusion/py-modindex.html
@@ -6,27 +6,27 @@
     <meta charset="utf-8" />
     <title>Python Module Index &#8212; Arrow Datafusion  documentation</title>
     
-  <link href="_static/css/theme.css" rel="stylesheet" />
-  <link href="_static/css/index.c5995385ac14fb8791e8eb36b4908be2.css" rel="stylesheet" />
-
+    <link href="_static/styles/theme.css?digest=1999514e3f237ded88cf" rel="stylesheet">
+<link href="_static/styles/pydata-sphinx-theme.css?digest=1999514e3f237ded88cf" rel="stylesheet">
+  
     
-  <link rel="stylesheet"
-    href="_static/vendor/fontawesome/5.13.0/css/all.min.css">
-  <link rel="preload" as="font" type="font/woff2" crossorigin
-    href="_static/vendor/fontawesome/5.13.0/webfonts/fa-solid-900.woff2">
-  <link rel="preload" as="font" type="font/woff2" crossorigin
-    href="_static/vendor/fontawesome/5.13.0/webfonts/fa-brands-400.woff2">
-
+    <link rel="stylesheet"
+      href="_static/vendor/fontawesome/5.13.0/css/all.min.css">
+    <link rel="preload" as="font" type="font/woff2" crossorigin
+      href="_static/vendor/fontawesome/5.13.0/webfonts/fa-solid-900.woff2">
+    <link rel="preload" as="font" type="font/woff2" crossorigin
+      href="_static/vendor/fontawesome/5.13.0/webfonts/fa-brands-400.woff2">
+  
     
       
-
+  
     
-    <link rel="stylesheet" href="_static/basic.css" type="text/css" />
+    <link rel="stylesheet" href="_static/styles/pydata-sphinx-theme.css" type="text/css" />
     <link rel="stylesheet" href="_static/pygments.css" type="text/css" />
     <link rel="stylesheet" type="text/css" href="_static/theme_overrides.css" />
     
-  <link rel="preload" as="script" href="_static/js/index.1c5a1a01449ed65a7b51.js">
-
+    <link rel="preload" as="script" href="_static/scripts/pydata-sphinx-theme.js?digest=1999514e3f237ded88cf">
+  
     <script id="documentation_options" data-url_root="./" src="_static/documentation_options.js"></script>
     <script src="_static/jquery.js"></script>
     <script src="_static/underscore.js"></script>
@@ -36,7 +36,10 @@
     <link rel="search" title="Search" href="search.html" />
 
     <meta name="viewport" content="width=device-width, initial-scale=1" />
-    <meta name="docsearch:language" content="en" />
+    <meta name="docsearch:language" content="None">
+    
+
+    <!-- Google Analytics -->
     
 
 
@@ -54,6 +57,7 @@
             
             <!-- Only show if we have sidebars configured, else just a small margin  -->
             <div class="col-12 col-md-3 bd-sidebar">
+              <div class="sidebar-start-items">
 <a class="navbar-brand" href="index.html">
   <img src="_static/images/DataFusion-Logo-Background-White.png" class="logo" alt="logo">
 </a>
@@ -66,7 +70,7 @@
 <nav class="bd-links" id="bd-docs-nav" aria-label="Main navigation">
   <div class="bd-toc-item active">
     
-    <p class="caption">
+    <p>
  <span class="caption-text">
   Supported Environments
  </span>
@@ -175,7 +179,7 @@
   </a>
  </li>
 </ul>
-<p class="caption">
+<p>
  <span class="caption-text">
   User Guide
  </span>
@@ -211,6 +215,11 @@
    </i>
   </label>
   <ul>
+   <li class="toctree-l2">
+    <a class="reference internal" href="user-guide/sql/sql_status.html">
+     Status
+    </a>
+   </li>
    <li class="toctree-l2">
     <a class="reference internal" href="user-guide/sql/select.html">
      SELECT syntax
@@ -315,7 +324,7 @@
   </a>
  </li>
 </ul>
-<p class="caption">
+<p>
  <span class="caption-text">
   Specification
  </span>
@@ -336,8 +345,13 @@
    Datafusion output field name semantic
   </a>
  </li>
+ <li class="toctree-l1">
+  <a class="reference internal" href="specification/quarterly_roadmap.html">
+   Roadmap
+  </a>
+ </li>
 </ul>
-<p class="caption">
+<p>
  <span class="caption-text">
   README
  </span>
@@ -354,7 +368,7 @@
   </a>
  </li>
 </ul>
-<p class="caption">
+<p>
  <span class="caption-text">
   Community
  </span>
@@ -380,6 +394,9 @@
     
   </div>
 </nav>
+              </div>
+              <div class="sidebar-end-items">
+              </div>
             </div>
             
           
@@ -426,10 +443,9 @@ <h1>Python Module Index</h1>
               </div>
               
               
-              <div class='prev-next-bottom'>
-                
-
-              </div>
+              <!-- Previous / next buttons -->
+<div class='prev-next-area'>
+</div>
               
           </main>
           
@@ -437,20 +453,19 @@ <h1>Python Module Index</h1>
       </div>
     </div>
   
-  <script src="_static/js/index.1c5a1a01449ed65a7b51.js"></script>
-
+    <script src="_static/scripts/pydata-sphinx-theme.js?digest=1999514e3f237ded88cf"></script>
   <footer class="footer mt-5 mt-md-0">
   <div class="container">
     
     <div class="footer-item">
       <p class="copyright">
-    &copy; Copyright 2021, Apache Software Foundation.<br/>
+    &copy; Copyright 2021, Apache Software Foundation.<br>
 </p>
     </div>
     
     <div class="footer-item">
       <p class="sphinx-version">
-Created using <a href="http://sphinx-doc.org/">Sphinx</a> 2.4.4.<br/>
+Created using <a href="http://sphinx-doc.org/">Sphinx</a> 2.4.4.<br>
 </p>
     </div>
     
diff --git a/datafusion/python/api.html b/datafusion/python/api.html
index 9877db00bac5..f94a09181bfa 100644
--- a/datafusion/python/api.html
+++ b/datafusion/python/api.html
@@ -3,30 +3,31 @@
 
 <html xmlns="http://www.w3.org/1999/xhtml">
   <head>
-    <meta charset="utf-8" />
+    <meta charset="utf-8" /><meta name="generator" content="Docutils 0.17.1: http://docutils.sourceforge.net/" />
+
     <title>API Reference &#8212; Arrow Datafusion  documentation</title>
     
-  <link href="../_static/css/theme.css" rel="stylesheet" />
-  <link href="../_static/css/index.c5995385ac14fb8791e8eb36b4908be2.css" rel="stylesheet" />
-
+    <link href="../_static/styles/theme.css?digest=1999514e3f237ded88cf" rel="stylesheet">
+<link href="../_static/styles/pydata-sphinx-theme.css?digest=1999514e3f237ded88cf" rel="stylesheet">
+  
     
-  <link rel="stylesheet"
-    href="../_static/vendor/fontawesome/5.13.0/css/all.min.css">
-  <link rel="preload" as="font" type="font/woff2" crossorigin
-    href="../_static/vendor/fontawesome/5.13.0/webfonts/fa-solid-900.woff2">
-  <link rel="preload" as="font" type="font/woff2" crossorigin
-    href="../_static/vendor/fontawesome/5.13.0/webfonts/fa-brands-400.woff2">
-
+    <link rel="stylesheet"
+      href="../_static/vendor/fontawesome/5.13.0/css/all.min.css">
+    <link rel="preload" as="font" type="font/woff2" crossorigin
+      href="../_static/vendor/fontawesome/5.13.0/webfonts/fa-solid-900.woff2">
+    <link rel="preload" as="font" type="font/woff2" crossorigin
+      href="../_static/vendor/fontawesome/5.13.0/webfonts/fa-brands-400.woff2">
+  
     
       
-
+  
     
-    <link rel="stylesheet" href="../_static/basic.css" type="text/css" />
+    <link rel="stylesheet" href="../_static/styles/pydata-sphinx-theme.css" type="text/css" />
     <link rel="stylesheet" href="../_static/pygments.css" type="text/css" />
     <link rel="stylesheet" type="text/css" href="../_static/theme_overrides.css" />
     
-  <link rel="preload" as="script" href="../_static/js/index.1c5a1a01449ed65a7b51.js">
-
+    <link rel="preload" as="script" href="../_static/scripts/pydata-sphinx-theme.js?digest=1999514e3f237ded88cf">
+  
     <script id="documentation_options" data-url_root="../" src="../_static/documentation_options.js"></script>
     <script src="../_static/jquery.js"></script>
     <script src="../_static/underscore.js"></script>
@@ -37,7 +38,10 @@
     <link rel="next" title="DataFrame" href="api/dataframe.html" />
     <link rel="prev" title="DataFusion in Python" href="index.html" />
     <meta name="viewport" content="width=device-width, initial-scale=1" />
-    <meta name="docsearch:language" content="en" />
+    <meta name="docsearch:language" content="None">
+    
+
+    <!-- Google Analytics -->
     
   </head>
   <body data-spy="scroll" data-target="#bd-toc-nav" data-offset="80">
@@ -53,6 +57,7 @@
             
             <!-- Only show if we have sidebars configured, else just a small margin  -->
             <div class="col-12 col-md-3 bd-sidebar">
+              <div class="sidebar-start-items">
 <a class="navbar-brand" href="../index.html">
   <img src="../_static/images/DataFusion-Logo-Background-White.png" class="logo" alt="logo">
 </a>
@@ -65,7 +70,7 @@
 <nav class="bd-links" id="bd-docs-nav" aria-label="Main navigation">
   <div class="bd-toc-item active">
     
-    <p class="caption">
+    <p>
  <span class="caption-text">
   Supported Environments
  </span>
@@ -126,7 +131,7 @@
   </a>
  </li>
 </ul>
-<p class="caption">
+<p>
  <span class="caption-text">
   User Guide
  </span>
@@ -162,6 +167,11 @@
    </i>
   </label>
   <ul>
+   <li class="toctree-l2">
+    <a class="reference internal" href="../user-guide/sql/sql_status.html">
+     Status
+    </a>
+   </li>
    <li class="toctree-l2">
     <a class="reference internal" href="../user-guide/sql/select.html">
      SELECT syntax
@@ -266,12 +276,17 @@
   </a>
  </li>
 </ul>
-<p class="caption">
+<p>
  <span class="caption-text">
   Specification
  </span>
 </p>
 <ul class="nav bd-sidenav">
+ <li class="toctree-l1">
+  <a class="reference internal" href="../specification/roadmap.html">
+   Roadmap
+  </a>
+ </li>
  <li class="toctree-l1">
   <a class="reference internal" href="../specification/invariants.html">
    DataFusion’s Invariants
@@ -282,8 +297,13 @@
    Datafusion output field name semantic
   </a>
  </li>
+ <li class="toctree-l1">
+  <a class="reference internal" href="../specification/quarterly_roadmap.html">
+   Roadmap
+  </a>
+ </li>
 </ul>
-<p class="caption">
+<p>
  <span class="caption-text">
   README
  </span>
@@ -300,7 +320,7 @@
   </a>
  </li>
 </ul>
-<p class="caption">
+<p>
  <span class="caption-text">
   Community
  </span>
@@ -316,11 +336,19 @@
    Issue tracker
   </a>
  </li>
+ <li class="toctree-l1">
+  <a class="reference external" href="https://github.com/apache/arrow-datafusion/blob/master/CODE_OF_CONDUCT.md">
+   Code of conduct
+  </a>
+ </li>
 </ul>
 
     
   </div>
 </nav>
+              </div>
+              <div class="sidebar-end-items">
+              </div>
             </div>
             
           
@@ -360,7 +388,7 @@
               
               <div>
                 
-  <div class="section" id="api-reference">
+  <section id="api-reference">
 <span id="api"></span><h1>API Reference<a class="headerlink" href="#api-reference" title="Permalink to this headline">¶</a></h1>
 <div class="toctree-wrapper compound">
 <ul>
@@ -382,18 +410,29 @@
 </li>
 </ul>
 </div>
-</div>
+</section>
 
 
               </div>
               
               
-              <div class='prev-next-bottom'>
-                
-    <a class='left-prev' id="prev-link" href="index.html" title="previous page">DataFusion in Python</a>
-    <a class='right-next' id="next-link" href="api/dataframe.html" title="next page">DataFrame</a>
-
-              </div>
+              <!-- Previous / next buttons -->
+<div class='prev-next-area'>
+    <a class='left-prev' id="prev-link" href="index.html" title="previous page">
+        <i class="fas fa-angle-left"></i>
+        <div class="prev-next-info">
+            <p class="prev-next-subtitle">previous</p>
+            <p class="prev-next-title">DataFusion in Python</p>
+        </div>
+    </a>
+    <a class='right-next' id="next-link" href="api/dataframe.html" title="next page">
+    <div class="prev-next-info">
+        <p class="prev-next-subtitle">next</p>
+        <p class="prev-next-title">DataFrame</p>
+    </div>
+    <i class="fas fa-angle-right"></i>
+    </a>
+</div>
               
           </main>
           
@@ -401,20 +440,19 @@
       </div>
     </div>
   
-  <script src="../_static/js/index.1c5a1a01449ed65a7b51.js"></script>
-
+    <script src="../_static/scripts/pydata-sphinx-theme.js?digest=1999514e3f237ded88cf"></script>
   <footer class="footer mt-5 mt-md-0">
   <div class="container">
     
     <div class="footer-item">
       <p class="copyright">
-    &copy; Copyright 2021, Apache Software Foundation.<br/>
+    &copy; Copyright 2021, Apache Software Foundation.<br>
 </p>
     </div>
     
     <div class="footer-item">
       <p class="sphinx-version">
-Created using <a href="http://sphinx-doc.org/">Sphinx</a> 2.4.4.<br/>
+Created using <a href="http://sphinx-doc.org/">Sphinx</a> 2.4.4.<br>
 </p>
     </div>
     
diff --git a/datafusion/python/api/dataframe.html b/datafusion/python/api/dataframe.html
index 9965b9a15019..dd4d49838c76 100644
--- a/datafusion/python/api/dataframe.html
+++ b/datafusion/python/api/dataframe.html
@@ -3,30 +3,31 @@
 
 <html xmlns="http://www.w3.org/1999/xhtml">
   <head>
-    <meta charset="utf-8" />
+    <meta charset="utf-8" /><meta name="generator" content="Docutils 0.17.1: http://docutils.sourceforge.net/" />
+
     <title>DataFrame &#8212; Arrow Datafusion  documentation</title>
     
-  <link href="../../_static/css/theme.css" rel="stylesheet" />
-  <link href="../../_static/css/index.c5995385ac14fb8791e8eb36b4908be2.css" rel="stylesheet" />
-
+    <link href="../../_static/styles/theme.css?digest=1999514e3f237ded88cf" rel="stylesheet">
+<link href="../../_static/styles/pydata-sphinx-theme.css?digest=1999514e3f237ded88cf" rel="stylesheet">
+  
     
-  <link rel="stylesheet"
-    href="../../_static/vendor/fontawesome/5.13.0/css/all.min.css">
-  <link rel="preload" as="font" type="font/woff2" crossorigin
-    href="../../_static/vendor/fontawesome/5.13.0/webfonts/fa-solid-900.woff2">
-  <link rel="preload" as="font" type="font/woff2" crossorigin
-    href="../../_static/vendor/fontawesome/5.13.0/webfonts/fa-brands-400.woff2">
-
+    <link rel="stylesheet"
+      href="../../_static/vendor/fontawesome/5.13.0/css/all.min.css">
+    <link rel="preload" as="font" type="font/woff2" crossorigin
+      href="../../_static/vendor/fontawesome/5.13.0/webfonts/fa-solid-900.woff2">
+    <link rel="preload" as="font" type="font/woff2" crossorigin
+      href="../../_static/vendor/fontawesome/5.13.0/webfonts/fa-brands-400.woff2">
+  
     
       
-
+  
     
-    <link rel="stylesheet" href="../../_static/basic.css" type="text/css" />
+    <link rel="stylesheet" href="../../_static/styles/pydata-sphinx-theme.css" type="text/css" />
     <link rel="stylesheet" href="../../_static/pygments.css" type="text/css" />
     <link rel="stylesheet" type="text/css" href="../../_static/theme_overrides.css" />
     
-  <link rel="preload" as="script" href="../../_static/js/index.1c5a1a01449ed65a7b51.js">
-
+    <link rel="preload" as="script" href="../../_static/scripts/pydata-sphinx-theme.js?digest=1999514e3f237ded88cf">
+  
     <script id="documentation_options" data-url_root="../../" src="../../_static/documentation_options.js"></script>
     <script src="../../_static/jquery.js"></script>
     <script src="../../_static/underscore.js"></script>
@@ -37,7 +38,10 @@
     <link rel="next" title="datafusion.DataFrame" href="../generated/datafusion.DataFrame.html" />
     <link rel="prev" title="API Reference" href="../api.html" />
     <meta name="viewport" content="width=device-width, initial-scale=1" />
-    <meta name="docsearch:language" content="en" />
+    <meta name="docsearch:language" content="None">
+    
+
+    <!-- Google Analytics -->
     
   </head>
   <body data-spy="scroll" data-target="#bd-toc-nav" data-offset="80">
@@ -53,6 +57,7 @@
             
             <!-- Only show if we have sidebars configured, else just a small margin  -->
             <div class="col-12 col-md-3 bd-sidebar">
+              <div class="sidebar-start-items">
 <a class="navbar-brand" href="../../index.html">
   <img src="../../_static/images/DataFusion-Logo-Background-White.png" class="logo" alt="logo">
 </a>
@@ -65,7 +70,7 @@
 <nav class="bd-links" id="bd-docs-nav" aria-label="Main navigation">
   <div class="bd-toc-item active">
     
-    <p class="caption">
+    <p>
  <span class="caption-text">
   Supported Environments
  </span>
@@ -126,7 +131,7 @@
   </a>
  </li>
 </ul>
-<p class="caption">
+<p>
  <span class="caption-text">
   User Guide
  </span>
@@ -162,6 +167,11 @@
    </i>
   </label>
   <ul>
+   <li class="toctree-l2">
+    <a class="reference internal" href="../../user-guide/sql/sql_status.html">
+     Status
+    </a>
+   </li>
    <li class="toctree-l2">
     <a class="reference internal" href="../../user-guide/sql/select.html">
      SELECT syntax
@@ -266,7 +276,7 @@
   </a>
  </li>
 </ul>
-<p class="caption">
+<p>
  <span class="caption-text">
   Specification
  </span>
@@ -287,8 +297,13 @@
    Datafusion output field name semantic
   </a>
  </li>
+ <li class="toctree-l1">
+  <a class="reference internal" href="../../specification/quarterly_roadmap.html">
+   Roadmap
+  </a>
+ </li>
 </ul>
-<p class="caption">
+<p>
  <span class="caption-text">
   README
  </span>
@@ -305,7 +320,7 @@
   </a>
  </li>
 </ul>
-<p class="caption">
+<p>
  <span class="caption-text">
   Community
  </span>
@@ -331,6 +346,9 @@
     
   </div>
 </nav>
+              </div>
+              <div class="sidebar-end-items">
+              </div>
             </div>
             
           
@@ -370,7 +388,7 @@
               
               <div>
                 
-  <div class="section" id="dataframe">
+  <section id="dataframe">
 <span id="api-dataframe"></span><h1>DataFrame<a class="headerlink" href="#dataframe" title="Permalink to this headline">¶</a></h1>
 <table class="longtable table autosummary">
 <colgroup>
@@ -379,22 +397,33 @@
 </colgroup>
 <tbody>
 <tr class="row-odd"><td><p><a class="reference internal" href="../generated/datafusion.DataFrame.html#datafusion.DataFrame" title="datafusion.DataFrame"><code class="xref py py-obj docutils literal notranslate"><span class="pre">DataFrame</span></code></a></p></td>
-<td><p>A DataFrame is a representation of a logical plan and an API to compose statements.</p></td>
+<td><p>A PyDataFrame is a representation of a logical plan and an API to compose statements.</p></td>
 </tr>
 </tbody>
 </table>
-</div>
+</section>
 
 
               </div>
               
               
-              <div class='prev-next-bottom'>
-                
-    <a class='left-prev' id="prev-link" href="../api.html" title="previous page">API Reference</a>
-    <a class='right-next' id="next-link" href="../generated/datafusion.DataFrame.html" title="next page">datafusion.DataFrame</a>
-
-              </div>
+              <!-- Previous / next buttons -->
+<div class='prev-next-area'>
+    <a class='left-prev' id="prev-link" href="../api.html" title="previous page">
+        <i class="fas fa-angle-left"></i>
+        <div class="prev-next-info">
+            <p class="prev-next-subtitle">previous</p>
+            <p class="prev-next-title">API Reference</p>
+        </div>
+    </a>
+    <a class='right-next' id="next-link" href="../generated/datafusion.DataFrame.html" title="next page">
+    <div class="prev-next-info">
+        <p class="prev-next-subtitle">next</p>
+        <p class="prev-next-title">datafusion.DataFrame</p>
+    </div>
+    <i class="fas fa-angle-right"></i>
+    </a>
+</div>
               
           </main>
           
@@ -402,20 +431,19 @@
       </div>
     </div>
   
-  <script src="../../_static/js/index.1c5a1a01449ed65a7b51.js"></script>
-
+    <script src="../../_static/scripts/pydata-sphinx-theme.js?digest=1999514e3f237ded88cf"></script>
   <footer class="footer mt-5 mt-md-0">
   <div class="container">
     
     <div class="footer-item">
       <p class="copyright">
-    &copy; Copyright 2021, Apache Software Foundation.<br/>
+    &copy; Copyright 2021, Apache Software Foundation.<br>
 </p>
     </div>
     
     <div class="footer-item">
       <p class="sphinx-version">
-Created using <a href="http://sphinx-doc.org/">Sphinx</a> 2.4.4.<br/>
+Created using <a href="http://sphinx-doc.org/">Sphinx</a> 2.4.4.<br>
 </p>
     </div>
     
diff --git a/datafusion/python/api/execution_context.html b/datafusion/python/api/execution_context.html
index b0580c2a1edd..835a04c43100 100644
--- a/datafusion/python/api/execution_context.html
+++ b/datafusion/python/api/execution_context.html
@@ -3,30 +3,31 @@
 
 <html xmlns="http://www.w3.org/1999/xhtml">
   <head>
-    <meta charset="utf-8" />
+    <meta charset="utf-8" /><meta name="generator" content="Docutils 0.17.1: http://docutils.sourceforge.net/" />
+
     <title>ExecutionContext &#8212; Arrow Datafusion  documentation</title>
     
-  <link href="../../_static/css/theme.css" rel="stylesheet" />
-  <link href="../../_static/css/index.c5995385ac14fb8791e8eb36b4908be2.css" rel="stylesheet" />
-
+    <link href="../../_static/styles/theme.css?digest=1999514e3f237ded88cf" rel="stylesheet">
+<link href="../../_static/styles/pydata-sphinx-theme.css?digest=1999514e3f237ded88cf" rel="stylesheet">
+  
     
-  <link rel="stylesheet"
-    href="../../_static/vendor/fontawesome/5.13.0/css/all.min.css">
-  <link rel="preload" as="font" type="font/woff2" crossorigin
-    href="../../_static/vendor/fontawesome/5.13.0/webfonts/fa-solid-900.woff2">
-  <link rel="preload" as="font" type="font/woff2" crossorigin
-    href="../../_static/vendor/fontawesome/5.13.0/webfonts/fa-brands-400.woff2">
-
+    <link rel="stylesheet"
+      href="../../_static/vendor/fontawesome/5.13.0/css/all.min.css">
+    <link rel="preload" as="font" type="font/woff2" crossorigin
+      href="../../_static/vendor/fontawesome/5.13.0/webfonts/fa-solid-900.woff2">
+    <link rel="preload" as="font" type="font/woff2" crossorigin
+      href="../../_static/vendor/fontawesome/5.13.0/webfonts/fa-brands-400.woff2">
+  
     
       
-
+  
     
-    <link rel="stylesheet" href="../../_static/basic.css" type="text/css" />
+    <link rel="stylesheet" href="../../_static/styles/pydata-sphinx-theme.css" type="text/css" />
     <link rel="stylesheet" href="../../_static/pygments.css" type="text/css" />
     <link rel="stylesheet" type="text/css" href="../../_static/theme_overrides.css" />
     
-  <link rel="preload" as="script" href="../../_static/js/index.1c5a1a01449ed65a7b51.js">
-
+    <link rel="preload" as="script" href="../../_static/scripts/pydata-sphinx-theme.js?digest=1999514e3f237ded88cf">
+  
     <script id="documentation_options" data-url_root="../../" src="../../_static/documentation_options.js"></script>
     <script src="../../_static/jquery.js"></script>
     <script src="../../_static/underscore.js"></script>
@@ -37,7 +38,10 @@
     <link rel="next" title="datafusion.ExecutionContext" href="../generated/datafusion.ExecutionContext.html" />
     <link rel="prev" title="datafusion.DataFrame" href="../generated/datafusion.DataFrame.html" />
     <meta name="viewport" content="width=device-width, initial-scale=1" />
-    <meta name="docsearch:language" content="en" />
+    <meta name="docsearch:language" content="None">
+    
+
+    <!-- Google Analytics -->
     
   </head>
   <body data-spy="scroll" data-target="#bd-toc-nav" data-offset="80">
@@ -53,6 +57,7 @@
             
             <!-- Only show if we have sidebars configured, else just a small margin  -->
             <div class="col-12 col-md-3 bd-sidebar">
+              <div class="sidebar-start-items">
 <a class="navbar-brand" href="../../index.html">
   <img src="../../_static/images/DataFusion-Logo-Background-White.png" class="logo" alt="logo">
 </a>
@@ -65,7 +70,7 @@
 <nav class="bd-links" id="bd-docs-nav" aria-label="Main navigation">
   <div class="bd-toc-item active">
     
-    <p class="caption">
+    <p>
  <span class="caption-text">
   Supported Environments
  </span>
@@ -126,7 +131,7 @@
   </a>
  </li>
 </ul>
-<p class="caption">
+<p>
  <span class="caption-text">
   User Guide
  </span>
@@ -162,6 +167,11 @@
    </i>
   </label>
   <ul>
+   <li class="toctree-l2">
+    <a class="reference internal" href="../../user-guide/sql/sql_status.html">
+     Status
+    </a>
+   </li>
    <li class="toctree-l2">
     <a class="reference internal" href="../../user-guide/sql/select.html">
      SELECT syntax
@@ -266,7 +276,7 @@
   </a>
  </li>
 </ul>
-<p class="caption">
+<p>
  <span class="caption-text">
   Specification
  </span>
@@ -287,8 +297,13 @@
    Datafusion output field name semantic
   </a>
  </li>
+ <li class="toctree-l1">
+  <a class="reference internal" href="../../specification/quarterly_roadmap.html">
+   Roadmap
+  </a>
+ </li>
 </ul>
-<p class="caption">
+<p>
  <span class="caption-text">
   README
  </span>
@@ -305,7 +320,7 @@
   </a>
  </li>
 </ul>
-<p class="caption">
+<p>
  <span class="caption-text">
   Community
  </span>
@@ -331,6 +346,9 @@
     
   </div>
 </nav>
+              </div>
+              <div class="sidebar-end-items">
+              </div>
             </div>
             
           
@@ -370,7 +388,7 @@
               
               <div>
                 
-  <div class="section" id="executioncontext">
+  <section id="executioncontext">
 <span id="api-execution-context"></span><h1>ExecutionContext<a class="headerlink" href="#executioncontext" title="Permalink to this headline">¶</a></h1>
 <table class="longtable table autosummary">
 <colgroup>
@@ -379,22 +397,33 @@
 </colgroup>
 <tbody>
 <tr class="row-odd"><td><p><a class="reference internal" href="../generated/datafusion.ExecutionContext.html#datafusion.ExecutionContext" title="datafusion.ExecutionContext"><code class="xref py py-obj docutils literal notranslate"><span class="pre">ExecutionContext</span></code></a></p></td>
-<td><p><cite>ExecutionContext</cite> is able to plan and execute DataFusion plans.</p></td>
+<td><p><cite>PyExecutionContext</cite> is able to plan and execute DataFusion plans.</p></td>
 </tr>
 </tbody>
 </table>
-</div>
+</section>
 
 
               </div>
               
               
-              <div class='prev-next-bottom'>
-                
-    <a class='left-prev' id="prev-link" href="../generated/datafusion.DataFrame.html" title="previous page">datafusion.DataFrame</a>
-    <a class='right-next' id="next-link" href="../generated/datafusion.ExecutionContext.html" title="next page">datafusion.ExecutionContext</a>
-
-              </div>
+              <!-- Previous / next buttons -->
+<div class='prev-next-area'>
+    <a class='left-prev' id="prev-link" href="../generated/datafusion.DataFrame.html" title="previous page">
+        <i class="fas fa-angle-left"></i>
+        <div class="prev-next-info">
+            <p class="prev-next-subtitle">previous</p>
+            <p class="prev-next-title">datafusion.DataFrame</p>
+        </div>
+    </a>
+    <a class='right-next' id="next-link" href="../generated/datafusion.ExecutionContext.html" title="next page">
+    <div class="prev-next-info">
+        <p class="prev-next-subtitle">next</p>
+        <p class="prev-next-title">datafusion.ExecutionContext</p>
+    </div>
+    <i class="fas fa-angle-right"></i>
+    </a>
+</div>
               
           </main>
           
@@ -402,20 +431,19 @@
       </div>
     </div>
   
-  <script src="../../_static/js/index.1c5a1a01449ed65a7b51.js"></script>
-
+    <script src="../../_static/scripts/pydata-sphinx-theme.js?digest=1999514e3f237ded88cf"></script>
   <footer class="footer mt-5 mt-md-0">
   <div class="container">
     
     <div class="footer-item">
       <p class="copyright">
-    &copy; Copyright 2021, Apache Software Foundation.<br/>
+    &copy; Copyright 2021, Apache Software Foundation.<br>
 </p>
     </div>
     
     <div class="footer-item">
       <p class="sphinx-version">
-Created using <a href="http://sphinx-doc.org/">Sphinx</a> 2.4.4.<br/>
+Created using <a href="http://sphinx-doc.org/">Sphinx</a> 2.4.4.<br>
 </p>
     </div>
     
diff --git a/datafusion/python/api/expression.html b/datafusion/python/api/expression.html
index 1e9ab9afa3f3..dabb3b334c5e 100644
--- a/datafusion/python/api/expression.html
+++ b/datafusion/python/api/expression.html
@@ -3,30 +3,31 @@
 
 <html xmlns="http://www.w3.org/1999/xhtml">
   <head>
-    <meta charset="utf-8" />
+    <meta charset="utf-8" /><meta name="generator" content="Docutils 0.17.1: http://docutils.sourceforge.net/" />
+
     <title>Expression &#8212; Arrow Datafusion  documentation</title>
     
-  <link href="../../_static/css/theme.css" rel="stylesheet" />
-  <link href="../../_static/css/index.c5995385ac14fb8791e8eb36b4908be2.css" rel="stylesheet" />
-
+    <link href="../../_static/styles/theme.css?digest=1999514e3f237ded88cf" rel="stylesheet">
+<link href="../../_static/styles/pydata-sphinx-theme.css?digest=1999514e3f237ded88cf" rel="stylesheet">
+  
     
-  <link rel="stylesheet"
-    href="../../_static/vendor/fontawesome/5.13.0/css/all.min.css">
-  <link rel="preload" as="font" type="font/woff2" crossorigin
-    href="../../_static/vendor/fontawesome/5.13.0/webfonts/fa-solid-900.woff2">
-  <link rel="preload" as="font" type="font/woff2" crossorigin
-    href="../../_static/vendor/fontawesome/5.13.0/webfonts/fa-brands-400.woff2">
-
+    <link rel="stylesheet"
+      href="../../_static/vendor/fontawesome/5.13.0/css/all.min.css">
+    <link rel="preload" as="font" type="font/woff2" crossorigin
+      href="../../_static/vendor/fontawesome/5.13.0/webfonts/fa-solid-900.woff2">
+    <link rel="preload" as="font" type="font/woff2" crossorigin
+      href="../../_static/vendor/fontawesome/5.13.0/webfonts/fa-brands-400.woff2">
+  
     
       
-
+  
     
-    <link rel="stylesheet" href="../../_static/basic.css" type="text/css" />
+    <link rel="stylesheet" href="../../_static/styles/pydata-sphinx-theme.css" type="text/css" />
     <link rel="stylesheet" href="../../_static/pygments.css" type="text/css" />
     <link rel="stylesheet" type="text/css" href="../../_static/theme_overrides.css" />
     
-  <link rel="preload" as="script" href="../../_static/js/index.1c5a1a01449ed65a7b51.js">
-
+    <link rel="preload" as="script" href="../../_static/scripts/pydata-sphinx-theme.js?digest=1999514e3f237ded88cf">
+  
     <script id="documentation_options" data-url_root="../../" src="../../_static/documentation_options.js"></script>
     <script src="../../_static/jquery.js"></script>
     <script src="../../_static/underscore.js"></script>
@@ -37,7 +38,10 @@
     <link rel="next" title="datafusion.Expression" href="../generated/datafusion.Expression.html" />
     <link rel="prev" title="datafusion.ExecutionContext" href="../generated/datafusion.ExecutionContext.html" />
     <meta name="viewport" content="width=device-width, initial-scale=1" />
-    <meta name="docsearch:language" content="en" />
+    <meta name="docsearch:language" content="None">
+    
+
+    <!-- Google Analytics -->
     
   </head>
   <body data-spy="scroll" data-target="#bd-toc-nav" data-offset="80">
@@ -53,6 +57,7 @@
             
             <!-- Only show if we have sidebars configured, else just a small margin  -->
             <div class="col-12 col-md-3 bd-sidebar">
+              <div class="sidebar-start-items">
 <a class="navbar-brand" href="../../index.html">
   <img src="../../_static/images/DataFusion-Logo-Background-White.png" class="logo" alt="logo">
 </a>
@@ -65,7 +70,7 @@
 <nav class="bd-links" id="bd-docs-nav" aria-label="Main navigation">
   <div class="bd-toc-item active">
     
-    <p class="caption">
+    <p>
  <span class="caption-text">
   Supported Environments
  </span>
@@ -126,7 +131,7 @@
   </a>
  </li>
 </ul>
-<p class="caption">
+<p>
  <span class="caption-text">
   User Guide
  </span>
@@ -162,6 +167,11 @@
    </i>
   </label>
   <ul>
+   <li class="toctree-l2">
+    <a class="reference internal" href="../../user-guide/sql/sql_status.html">
+     Status
+    </a>
+   </li>
    <li class="toctree-l2">
     <a class="reference internal" href="../../user-guide/sql/select.html">
      SELECT syntax
@@ -266,7 +276,7 @@
   </a>
  </li>
 </ul>
-<p class="caption">
+<p>
  <span class="caption-text">
   Specification
  </span>
@@ -287,8 +297,13 @@
    Datafusion output field name semantic
   </a>
  </li>
+ <li class="toctree-l1">
+  <a class="reference internal" href="../../specification/quarterly_roadmap.html">
+   Roadmap
+  </a>
+ </li>
 </ul>
-<p class="caption">
+<p>
  <span class="caption-text">
   README
  </span>
@@ -305,7 +320,7 @@
   </a>
  </li>
 </ul>
-<p class="caption">
+<p>
  <span class="caption-text">
   Community
  </span>
@@ -331,6 +346,9 @@
     
   </div>
 </nav>
+              </div>
+              <div class="sidebar-end-items">
+              </div>
             </div>
             
           
@@ -370,7 +388,7 @@
               
               <div>
                 
-  <div class="section" id="expression">
+  <section id="expression">
 <span id="api-expression"></span><h1>Expression<a class="headerlink" href="#expression" title="Permalink to this headline">¶</a></h1>
 <table class="longtable table autosummary">
 <colgroup>
@@ -379,22 +397,33 @@
 </colgroup>
 <tbody>
 <tr class="row-odd"><td><p><a class="reference internal" href="../generated/datafusion.Expression.html#datafusion.Expression" title="datafusion.Expression"><code class="xref py py-obj docutils literal notranslate"><span class="pre">Expression</span></code></a></p></td>
-<td><p>An expression that can be used on a DataFrame</p></td>
+<td><p>An PyExpr that can be used on a DataFrame</p></td>
 </tr>
 </tbody>
 </table>
-</div>
+</section>
 
 
               </div>
               
               
-              <div class='prev-next-bottom'>
-                
-    <a class='left-prev' id="prev-link" href="../generated/datafusion.ExecutionContext.html" title="previous page">datafusion.ExecutionContext</a>
-    <a class='right-next' id="next-link" href="../generated/datafusion.Expression.html" title="next page">datafusion.Expression</a>
-
-              </div>
+              <!-- Previous / next buttons -->
+<div class='prev-next-area'>
+    <a class='left-prev' id="prev-link" href="../generated/datafusion.ExecutionContext.html" title="previous page">
+        <i class="fas fa-angle-left"></i>
+        <div class="prev-next-info">
+            <p class="prev-next-subtitle">previous</p>
+            <p class="prev-next-title">datafusion.ExecutionContext</p>
+        </div>
+    </a>
+    <a class='right-next' id="next-link" href="../generated/datafusion.Expression.html" title="next page">
+    <div class="prev-next-info">
+        <p class="prev-next-subtitle">next</p>
+        <p class="prev-next-title">datafusion.Expression</p>
+    </div>
+    <i class="fas fa-angle-right"></i>
+    </a>
+</div>
               
           </main>
           
@@ -402,20 +431,19 @@
       </div>
     </div>
   
-  <script src="../../_static/js/index.1c5a1a01449ed65a7b51.js"></script>
-
+    <script src="../../_static/scripts/pydata-sphinx-theme.js?digest=1999514e3f237ded88cf"></script>
   <footer class="footer mt-5 mt-md-0">
   <div class="container">
     
     <div class="footer-item">
       <p class="copyright">
-    &copy; Copyright 2021, Apache Software Foundation.<br/>
+    &copy; Copyright 2021, Apache Software Foundation.<br>
 </p>
     </div>
     
     <div class="footer-item">
       <p class="sphinx-version">
-Created using <a href="http://sphinx-doc.org/">Sphinx</a> 2.4.4.<br/>
+Created using <a href="http://sphinx-doc.org/">Sphinx</a> 2.4.4.<br>
 </p>
     </div>
     
diff --git a/datafusion/python/api/functions.html b/datafusion/python/api/functions.html
index f771b80128c7..a27d174443bc 100644
--- a/datafusion/python/api/functions.html
+++ b/datafusion/python/api/functions.html
@@ -3,30 +3,31 @@
 
 <html xmlns="http://www.w3.org/1999/xhtml">
   <head>
-    <meta charset="utf-8" />
+    <meta charset="utf-8" /><meta name="generator" content="Docutils 0.17.1: http://docutils.sourceforge.net/" />
+
     <title>Functions &#8212; Arrow Datafusion  documentation</title>
     
-  <link href="../../_static/css/theme.css" rel="stylesheet" />
-  <link href="../../_static/css/index.c5995385ac14fb8791e8eb36b4908be2.css" rel="stylesheet" />
-
+    <link href="../../_static/styles/theme.css?digest=1999514e3f237ded88cf" rel="stylesheet">
+<link href="../../_static/styles/pydata-sphinx-theme.css?digest=1999514e3f237ded88cf" rel="stylesheet">
+  
     
-  <link rel="stylesheet"
-    href="../../_static/vendor/fontawesome/5.13.0/css/all.min.css">
-  <link rel="preload" as="font" type="font/woff2" crossorigin
-    href="../../_static/vendor/fontawesome/5.13.0/webfonts/fa-solid-900.woff2">
-  <link rel="preload" as="font" type="font/woff2" crossorigin
-    href="../../_static/vendor/fontawesome/5.13.0/webfonts/fa-brands-400.woff2">
-
+    <link rel="stylesheet"
+      href="../../_static/vendor/fontawesome/5.13.0/css/all.min.css">
+    <link rel="preload" as="font" type="font/woff2" crossorigin
+      href="../../_static/vendor/fontawesome/5.13.0/webfonts/fa-solid-900.woff2">
+    <link rel="preload" as="font" type="font/woff2" crossorigin
+      href="../../_static/vendor/fontawesome/5.13.0/webfonts/fa-brands-400.woff2">
+  
     
       
-
+  
     
-    <link rel="stylesheet" href="../../_static/basic.css" type="text/css" />
+    <link rel="stylesheet" href="../../_static/styles/pydata-sphinx-theme.css" type="text/css" />
     <link rel="stylesheet" href="../../_static/pygments.css" type="text/css" />
     <link rel="stylesheet" type="text/css" href="../../_static/theme_overrides.css" />
     
-  <link rel="preload" as="script" href="../../_static/js/index.1c5a1a01449ed65a7b51.js">
-
+    <link rel="preload" as="script" href="../../_static/scripts/pydata-sphinx-theme.js?digest=1999514e3f237ded88cf">
+  
     <script id="documentation_options" data-url_root="../../" src="../../_static/documentation_options.js"></script>
     <script src="../../_static/jquery.js"></script>
     <script src="../../_static/underscore.js"></script>
@@ -37,7 +38,10 @@
     <link rel="next" title="datafusion.functions" href="../generated/datafusion.functions.html" />
     <link rel="prev" title="datafusion.Expression" href="../generated/datafusion.Expression.html" />
     <meta name="viewport" content="width=device-width, initial-scale=1" />
-    <meta name="docsearch:language" content="en" />
+    <meta name="docsearch:language" content="None">
+    
+
+    <!-- Google Analytics -->
     
   </head>
   <body data-spy="scroll" data-target="#bd-toc-nav" data-offset="80">
@@ -53,6 +57,7 @@
             
             <!-- Only show if we have sidebars configured, else just a small margin  -->
             <div class="col-12 col-md-3 bd-sidebar">
+              <div class="sidebar-start-items">
 <a class="navbar-brand" href="../../index.html">
   <img src="../../_static/images/DataFusion-Logo-Background-White.png" class="logo" alt="logo">
 </a>
@@ -65,7 +70,7 @@
 <nav class="bd-links" id="bd-docs-nav" aria-label="Main navigation">
   <div class="bd-toc-item active">
     
-    <p class="caption">
+    <p>
  <span class="caption-text">
   Supported Environments
  </span>
@@ -126,7 +131,7 @@
   </a>
  </li>
 </ul>
-<p class="caption">
+<p>
  <span class="caption-text">
   User Guide
  </span>
@@ -162,6 +167,11 @@
    </i>
   </label>
   <ul>
+   <li class="toctree-l2">
+    <a class="reference internal" href="../../user-guide/sql/sql_status.html">
+     Status
+    </a>
+   </li>
    <li class="toctree-l2">
     <a class="reference internal" href="../../user-guide/sql/select.html">
      SELECT syntax
@@ -266,7 +276,7 @@
   </a>
  </li>
 </ul>
-<p class="caption">
+<p>
  <span class="caption-text">
   Specification
  </span>
@@ -287,8 +297,13 @@
    Datafusion output field name semantic
   </a>
  </li>
+ <li class="toctree-l1">
+  <a class="reference internal" href="../../specification/quarterly_roadmap.html">
+   Roadmap
+  </a>
+ </li>
 </ul>
-<p class="caption">
+<p>
  <span class="caption-text">
   README
  </span>
@@ -305,7 +320,7 @@
   </a>
  </li>
 </ul>
-<p class="caption">
+<p>
  <span class="caption-text">
   Community
  </span>
@@ -331,6 +346,9 @@
     
   </div>
 </nav>
+              </div>
+              <div class="sidebar-end-items">
+              </div>
             </div>
             
           
@@ -370,7 +388,7 @@
               
               <div>
                 
-  <div class="section" id="functions">
+  <section id="functions">
 <span id="api-functions"></span><h1>Functions<a class="headerlink" href="#functions" title="Permalink to this headline">¶</a></h1>
 <table class="longtable table autosummary">
 <colgroup>
@@ -383,18 +401,29 @@
 </tr>
 </tbody>
 </table>
-</div>
+</section>
 
 
               </div>
               
               
-              <div class='prev-next-bottom'>
-                
-    <a class='left-prev' id="prev-link" href="../generated/datafusion.Expression.html" title="previous page">datafusion.Expression</a>
-    <a class='right-next' id="next-link" href="../generated/datafusion.functions.html" title="next page">datafusion.functions</a>
-
-              </div>
+              <!-- Previous / next buttons -->
+<div class='prev-next-area'>
+    <a class='left-prev' id="prev-link" href="../generated/datafusion.Expression.html" title="previous page">
+        <i class="fas fa-angle-left"></i>
+        <div class="prev-next-info">
+            <p class="prev-next-subtitle">previous</p>
+            <p class="prev-next-title">datafusion.Expression</p>
+        </div>
+    </a>
+    <a class='right-next' id="next-link" href="../generated/datafusion.functions.html" title="next page">
+    <div class="prev-next-info">
+        <p class="prev-next-subtitle">next</p>
+        <p class="prev-next-title">datafusion.functions</p>
+    </div>
+    <i class="fas fa-angle-right"></i>
+    </a>
+</div>
               
           </main>
           
@@ -402,20 +431,19 @@
       </div>
     </div>
   
-  <script src="../../_static/js/index.1c5a1a01449ed65a7b51.js"></script>
-
+    <script src="../../_static/scripts/pydata-sphinx-theme.js?digest=1999514e3f237ded88cf"></script>
   <footer class="footer mt-5 mt-md-0">
   <div class="container">
     
     <div class="footer-item">
       <p class="copyright">
-    &copy; Copyright 2021, Apache Software Foundation.<br/>
+    &copy; Copyright 2021, Apache Software Foundation.<br>
 </p>
     </div>
     
     <div class="footer-item">
       <p class="sphinx-version">
-Created using <a href="http://sphinx-doc.org/">Sphinx</a> 2.4.4.<br/>
+Created using <a href="http://sphinx-doc.org/">Sphinx</a> 2.4.4.<br>
 </p>
     </div>
     
diff --git a/datafusion/python/generated/datafusion.DataFrame.html b/datafusion/python/generated/datafusion.DataFrame.html
index cf6fc81778e9..58239fd97b24 100644
--- a/datafusion/python/generated/datafusion.DataFrame.html
+++ b/datafusion/python/generated/datafusion.DataFrame.html
@@ -3,30 +3,31 @@
 
 <html xmlns="http://www.w3.org/1999/xhtml">
   <head>
-    <meta charset="utf-8" />
+    <meta charset="utf-8" /><meta name="generator" content="Docutils 0.17.1: http://docutils.sourceforge.net/" />
+
     <title>datafusion.DataFrame &#8212; Arrow Datafusion  documentation</title>
     
-  <link href="../../_static/css/theme.css" rel="stylesheet" />
-  <link href="../../_static/css/index.c5995385ac14fb8791e8eb36b4908be2.css" rel="stylesheet" />
-
+    <link href="../../_static/styles/theme.css?digest=1999514e3f237ded88cf" rel="stylesheet">
+<link href="../../_static/styles/pydata-sphinx-theme.css?digest=1999514e3f237ded88cf" rel="stylesheet">
+  
     
-  <link rel="stylesheet"
-    href="../../_static/vendor/fontawesome/5.13.0/css/all.min.css">
-  <link rel="preload" as="font" type="font/woff2" crossorigin
-    href="../../_static/vendor/fontawesome/5.13.0/webfonts/fa-solid-900.woff2">
-  <link rel="preload" as="font" type="font/woff2" crossorigin
-    href="../../_static/vendor/fontawesome/5.13.0/webfonts/fa-brands-400.woff2">
-
+    <link rel="stylesheet"
+      href="../../_static/vendor/fontawesome/5.13.0/css/all.min.css">
+    <link rel="preload" as="font" type="font/woff2" crossorigin
+      href="../../_static/vendor/fontawesome/5.13.0/webfonts/fa-solid-900.woff2">
+    <link rel="preload" as="font" type="font/woff2" crossorigin
+      href="../../_static/vendor/fontawesome/5.13.0/webfonts/fa-brands-400.woff2">
+  
     
       
-
+  
     
-    <link rel="stylesheet" href="../../_static/basic.css" type="text/css" />
+    <link rel="stylesheet" href="../../_static/styles/pydata-sphinx-theme.css" type="text/css" />
     <link rel="stylesheet" href="../../_static/pygments.css" type="text/css" />
     <link rel="stylesheet" type="text/css" href="../../_static/theme_overrides.css" />
     
-  <link rel="preload" as="script" href="../../_static/js/index.1c5a1a01449ed65a7b51.js">
-
+    <link rel="preload" as="script" href="../../_static/scripts/pydata-sphinx-theme.js?digest=1999514e3f237ded88cf">
+  
     <script id="documentation_options" data-url_root="../../" src="../../_static/documentation_options.js"></script>
     <script src="../../_static/jquery.js"></script>
     <script src="../../_static/underscore.js"></script>
@@ -37,7 +38,10 @@
     <link rel="next" title="ExecutionContext" href="../api/execution_context.html" />
     <link rel="prev" title="DataFrame" href="../api/dataframe.html" />
     <meta name="viewport" content="width=device-width, initial-scale=1" />
-    <meta name="docsearch:language" content="en" />
+    <meta name="docsearch:language" content="None">
+    
+
+    <!-- Google Analytics -->
     
   </head>
   <body data-spy="scroll" data-target="#bd-toc-nav" data-offset="80">
@@ -53,6 +57,7 @@
             
             <!-- Only show if we have sidebars configured, else just a small margin  -->
             <div class="col-12 col-md-3 bd-sidebar">
+              <div class="sidebar-start-items">
 <a class="navbar-brand" href="../../index.html">
   <img src="../../_static/images/DataFusion-Logo-Background-White.png" class="logo" alt="logo">
 </a>
@@ -65,7 +70,7 @@
 <nav class="bd-links" id="bd-docs-nav" aria-label="Main navigation">
   <div class="bd-toc-item active">
     
-    <p class="caption">
+    <p>
  <span class="caption-text">
   Supported Environments
  </span>
@@ -126,7 +131,7 @@
   </a>
  </li>
 </ul>
-<p class="caption">
+<p>
  <span class="caption-text">
   User Guide
  </span>
@@ -162,6 +167,11 @@
    </i>
   </label>
   <ul>
+   <li class="toctree-l2">
+    <a class="reference internal" href="../../user-guide/sql/sql_status.html">
+     Status
+    </a>
+   </li>
    <li class="toctree-l2">
     <a class="reference internal" href="../../user-guide/sql/select.html">
      SELECT syntax
@@ -266,7 +276,7 @@
   </a>
  </li>
 </ul>
-<p class="caption">
+<p>
  <span class="caption-text">
   Specification
  </span>
@@ -287,8 +297,13 @@
    Datafusion output field name semantic
   </a>
  </li>
+ <li class="toctree-l1">
+  <a class="reference internal" href="../../specification/quarterly_roadmap.html">
+   Roadmap
+  </a>
+ </li>
 </ul>
-<p class="caption">
+<p>
  <span class="caption-text">
   README
  </span>
@@ -305,7 +320,7 @@
   </a>
  </li>
 </ul>
-<p class="caption">
+<p>
  <span class="caption-text">
   Community
  </span>
@@ -331,6 +346,9 @@
     
   </div>
 </nav>
+              </div>
+              <div class="sidebar-end-items">
+              </div>
             </div>
             
           
@@ -370,7 +388,7 @@
               
               <div>
                 
-  <div class="section" id="datafusion-dataframe">
+  <section id="datafusion-dataframe">
 <h1>datafusion.DataFrame<a class="headerlink" href="#datafusion-dataframe" title="Permalink to this headline">¶</a></h1>
 <dl class="class">
 <dt id="datafusion.DataFrame">
@@ -410,13 +428,16 @@ <h1>datafusion.DataFrame<a class="headerlink" href="#datafusion-dataframe" title
 <tr class="row-even"><td><p><a class="reference internal" href="#datafusion.DataFrame.limit" title="datafusion.DataFrame.limit"><code class="xref py py-obj docutils literal notranslate"><span class="pre">limit</span></code></a></p></td>
 <td><p></p></td>
 </tr>
-<tr class="row-odd"><td><p><a class="reference internal" href="#datafusion.DataFrame.select" title="datafusion.DataFrame.select"><code class="xref py py-obj docutils literal notranslate"><span class="pre">select</span></code></a></p></td>
+<tr class="row-odd"><td><p><a class="reference internal" href="#datafusion.DataFrame.schema" title="datafusion.DataFrame.schema"><code class="xref py py-obj docutils literal notranslate"><span class="pre">schema</span></code></a></p></td>
+<td><p>Returns the schema from the logical plan</p></td>
+</tr>
+<tr class="row-even"><td><p><a class="reference internal" href="#datafusion.DataFrame.select" title="datafusion.DataFrame.select"><code class="xref py py-obj docutils literal notranslate"><span class="pre">select</span></code></a></p></td>
 <td><p></p></td>
 </tr>
-<tr class="row-even"><td><p><a class="reference internal" href="#datafusion.DataFrame.show" title="datafusion.DataFrame.show"><code class="xref py py-obj docutils literal notranslate"><span class="pre">show</span></code></a></p></td>
+<tr class="row-odd"><td><p><a class="reference internal" href="#datafusion.DataFrame.show" title="datafusion.DataFrame.show"><code class="xref py py-obj docutils literal notranslate"><span class="pre">show</span></code></a></p></td>
 <td><p>Print the result, 20 lines by default</p></td>
 </tr>
-<tr class="row-odd"><td><p><a class="reference internal" href="#datafusion.DataFrame.sort" title="datafusion.DataFrame.sort"><code class="xref py py-obj docutils literal notranslate"><span class="pre">sort</span></code></a></p></td>
+<tr class="row-even"><td><p><a class="reference internal" href="#datafusion.DataFrame.sort" title="datafusion.DataFrame.sort"><code class="xref py py-obj docutils literal notranslate"><span class="pre">sort</span></code></a></p></td>
 <td><p></p></td>
 </tr>
 </tbody>
@@ -473,18 +494,29 @@ <h1>datafusion.DataFrame<a class="headerlink" href="#datafusion-dataframe" title
 
 </dd></dl>
 
-</div>
+</section>
 
 
               </div>
               
               
-              <div class='prev-next-bottom'>
-                
-    <a class='left-prev' id="prev-link" href="../api/dataframe.html" title="previous page">DataFrame</a>
-    <a class='right-next' id="next-link" href="../api/execution_context.html" title="next page">ExecutionContext</a>
-
-              </div>
+              <!-- Previous / next buttons -->
+<div class='prev-next-area'>
+    <a class='left-prev' id="prev-link" href="../api/dataframe.html" title="previous page">
+        <i class="fas fa-angle-left"></i>
+        <div class="prev-next-info">
+            <p class="prev-next-subtitle">previous</p>
+            <p class="prev-next-title">DataFrame</p>
+        </div>
+    </a>
+    <a class='right-next' id="next-link" href="../api/execution_context.html" title="next page">
+    <div class="prev-next-info">
+        <p class="prev-next-subtitle">next</p>
+        <p class="prev-next-title">ExecutionContext</p>
+    </div>
+    <i class="fas fa-angle-right"></i>
+    </a>
+</div>
               
           </main>
           
@@ -492,20 +524,19 @@ <h1>datafusion.DataFrame<a class="headerlink" href="#datafusion-dataframe" title
       </div>
     </div>
   
-  <script src="../../_static/js/index.1c5a1a01449ed65a7b51.js"></script>
-
+    <script src="../../_static/scripts/pydata-sphinx-theme.js?digest=1999514e3f237ded88cf"></script>
   <footer class="footer mt-5 mt-md-0">
   <div class="container">
     
     <div class="footer-item">
       <p class="copyright">
-    &copy; Copyright 2021, Apache Software Foundation.<br/>
+    &copy; Copyright 2021, Apache Software Foundation.<br>
 </p>
     </div>
     
     <div class="footer-item">
       <p class="sphinx-version">
-Created using <a href="http://sphinx-doc.org/">Sphinx</a> 2.4.4.<br/>
+Created using <a href="http://sphinx-doc.org/">Sphinx</a> 2.4.4.<br>
 </p>
     </div>
     
diff --git a/datafusion/python/generated/datafusion.ExecutionContext.html b/datafusion/python/generated/datafusion.ExecutionContext.html
index a69e7f7575ab..8b78f54df07d 100644
--- a/datafusion/python/generated/datafusion.ExecutionContext.html
+++ b/datafusion/python/generated/datafusion.ExecutionContext.html
@@ -3,30 +3,31 @@
 
 <html xmlns="http://www.w3.org/1999/xhtml">
   <head>
-    <meta charset="utf-8" />
+    <meta charset="utf-8" /><meta name="generator" content="Docutils 0.17.1: http://docutils.sourceforge.net/" />
+
     <title>datafusion.ExecutionContext &#8212; Arrow Datafusion  documentation</title>
     
-  <link href="../../_static/css/theme.css" rel="stylesheet" />
-  <link href="../../_static/css/index.c5995385ac14fb8791e8eb36b4908be2.css" rel="stylesheet" />
-
+    <link href="../../_static/styles/theme.css?digest=1999514e3f237ded88cf" rel="stylesheet">
+<link href="../../_static/styles/pydata-sphinx-theme.css?digest=1999514e3f237ded88cf" rel="stylesheet">
+  
     
-  <link rel="stylesheet"
-    href="../../_static/vendor/fontawesome/5.13.0/css/all.min.css">
-  <link rel="preload" as="font" type="font/woff2" crossorigin
-    href="../../_static/vendor/fontawesome/5.13.0/webfonts/fa-solid-900.woff2">
-  <link rel="preload" as="font" type="font/woff2" crossorigin
-    href="../../_static/vendor/fontawesome/5.13.0/webfonts/fa-brands-400.woff2">
-
+    <link rel="stylesheet"
+      href="../../_static/vendor/fontawesome/5.13.0/css/all.min.css">
+    <link rel="preload" as="font" type="font/woff2" crossorigin
+      href="../../_static/vendor/fontawesome/5.13.0/webfonts/fa-solid-900.woff2">
+    <link rel="preload" as="font" type="font/woff2" crossorigin
+      href="../../_static/vendor/fontawesome/5.13.0/webfonts/fa-brands-400.woff2">
+  
     
       
-
+  
     
-    <link rel="stylesheet" href="../../_static/basic.css" type="text/css" />
+    <link rel="stylesheet" href="../../_static/styles/pydata-sphinx-theme.css" type="text/css" />
     <link rel="stylesheet" href="../../_static/pygments.css" type="text/css" />
     <link rel="stylesheet" type="text/css" href="../../_static/theme_overrides.css" />
     
-  <link rel="preload" as="script" href="../../_static/js/index.1c5a1a01449ed65a7b51.js">
-
+    <link rel="preload" as="script" href="../../_static/scripts/pydata-sphinx-theme.js?digest=1999514e3f237ded88cf">
+  
     <script id="documentation_options" data-url_root="../../" src="../../_static/documentation_options.js"></script>
     <script src="../../_static/jquery.js"></script>
     <script src="../../_static/underscore.js"></script>
@@ -37,7 +38,10 @@
     <link rel="next" title="Expression" href="../api/expression.html" />
     <link rel="prev" title="ExecutionContext" href="../api/execution_context.html" />
     <meta name="viewport" content="width=device-width, initial-scale=1" />
-    <meta name="docsearch:language" content="en" />
+    <meta name="docsearch:language" content="None">
+    
+
+    <!-- Google Analytics -->
     
   </head>
   <body data-spy="scroll" data-target="#bd-toc-nav" data-offset="80">
@@ -53,6 +57,7 @@
             
             <!-- Only show if we have sidebars configured, else just a small margin  -->
             <div class="col-12 col-md-3 bd-sidebar">
+              <div class="sidebar-start-items">
 <a class="navbar-brand" href="../../index.html">
   <img src="../../_static/images/DataFusion-Logo-Background-White.png" class="logo" alt="logo">
 </a>
@@ -65,7 +70,7 @@
 <nav class="bd-links" id="bd-docs-nav" aria-label="Main navigation">
   <div class="bd-toc-item active">
     
-    <p class="caption">
+    <p>
  <span class="caption-text">
   Supported Environments
  </span>
@@ -126,7 +131,7 @@
   </a>
  </li>
 </ul>
-<p class="caption">
+<p>
  <span class="caption-text">
   User Guide
  </span>
@@ -162,6 +167,11 @@
    </i>
   </label>
   <ul>
+   <li class="toctree-l2">
+    <a class="reference internal" href="../../user-guide/sql/sql_status.html">
+     Status
+    </a>
+   </li>
    <li class="toctree-l2">
     <a class="reference internal" href="../../user-guide/sql/select.html">
      SELECT syntax
@@ -266,7 +276,7 @@
   </a>
  </li>
 </ul>
-<p class="caption">
+<p>
  <span class="caption-text">
   Specification
  </span>
@@ -287,8 +297,13 @@
    Datafusion output field name semantic
   </a>
  </li>
+ <li class="toctree-l1">
+  <a class="reference internal" href="../../specification/quarterly_roadmap.html">
+   Roadmap
+  </a>
+ </li>
 </ul>
-<p class="caption">
+<p>
  <span class="caption-text">
   README
  </span>
@@ -305,7 +320,7 @@
   </a>
  </li>
 </ul>
-<p class="caption">
+<p>
  <span class="caption-text">
   Community
  </span>
@@ -331,6 +346,9 @@
     
   </div>
 </nav>
+              </div>
+              <div class="sidebar-end-items">
+              </div>
             </div>
             
           
@@ -370,7 +388,7 @@
               
               <div>
                 
-  <div class="section" id="datafusion-executioncontext">
+  <section id="datafusion-executioncontext">
 <h1>datafusion.ExecutionContext<a class="headerlink" href="#datafusion-executioncontext" title="Permalink to this headline">¶</a></h1>
 <dl class="class">
 <dt id="datafusion.ExecutionContext">
@@ -395,7 +413,13 @@ <h1>datafusion.ExecutionContext<a class="headerlink" href="#datafusion-execution
 <tr class="row-odd"><td><p><a class="reference internal" href="#datafusion.ExecutionContext.__init__" title="datafusion.ExecutionContext.__init__"><code class="xref py py-obj docutils literal notranslate"><span class="pre">__init__</span></code></a></p></td>
 <td><p>Initialize self.</p></td>
 </tr>
-<tr class="row-even"><td><p><a class="reference internal" href="#datafusion.ExecutionContext.create_dataframe" title="datafusion.ExecutionContext.create_dataframe"><code class="xref py py-obj docutils literal notranslate"><span class="pre">create_dataframe</span></code></a></p></td>
+<tr class="row-even"><td><p><a class="reference internal" href="#datafusion.ExecutionContext.catalog" title="datafusion.ExecutionContext.catalog"><code class="xref py py-obj docutils literal notranslate"><span class="pre">catalog</span></code></a></p></td>
+<td><p></p></td>
+</tr>
+<tr class="row-odd"><td><p><a class="reference internal" href="#datafusion.ExecutionContext.create_dataframe" title="datafusion.ExecutionContext.create_dataframe"><code class="xref py py-obj docutils literal notranslate"><span class="pre">create_dataframe</span></code></a></p></td>
+<td><p></p></td>
+</tr>
+<tr class="row-even"><td><p><a class="reference internal" href="#datafusion.ExecutionContext.empty_table" title="datafusion.ExecutionContext.empty_table"><code class="xref py py-obj docutils literal notranslate"><span class="pre">empty_table</span></code></a></p></td>
 <td><p></p></td>
 </tr>
 <tr class="row-odd"><td><p><a class="reference internal" href="#datafusion.ExecutionContext.register_csv" title="datafusion.ExecutionContext.register_csv"><code class="xref py py-obj docutils literal notranslate"><span class="pre">register_csv</span></code></a></p></td>
@@ -404,12 +428,18 @@ <h1>datafusion.ExecutionContext<a class="headerlink" href="#datafusion-execution
 <tr class="row-even"><td><p><a class="reference internal" href="#datafusion.ExecutionContext.register_parquet" title="datafusion.ExecutionContext.register_parquet"><code class="xref py py-obj docutils literal notranslate"><span class="pre">register_parquet</span></code></a></p></td>
 <td><p></p></td>
 </tr>
-<tr class="row-odd"><td><p><a class="reference internal" href="#datafusion.ExecutionContext.register_udf" title="datafusion.ExecutionContext.register_udf"><code class="xref py py-obj docutils literal notranslate"><span class="pre">register_udf</span></code></a></p></td>
+<tr class="row-odd"><td><p><a class="reference internal" href="#datafusion.ExecutionContext.register_record_batches" title="datafusion.ExecutionContext.register_record_batches"><code class="xref py py-obj docutils literal notranslate"><span class="pre">register_record_batches</span></code></a></p></td>
 <td><p></p></td>
 </tr>
-<tr class="row-even"><td><p><a class="reference internal" href="#datafusion.ExecutionContext.sql" title="datafusion.ExecutionContext.sql"><code class="xref py py-obj docutils literal notranslate"><span class="pre">sql</span></code></a></p></td>
+<tr class="row-even"><td><p><a class="reference internal" href="#datafusion.ExecutionContext.register_udf" title="datafusion.ExecutionContext.register_udf"><code class="xref py py-obj docutils literal notranslate"><span class="pre">register_udf</span></code></a></p></td>
+<td><p></p></td>
+</tr>
+<tr class="row-odd"><td><p><a class="reference internal" href="#datafusion.ExecutionContext.sql" title="datafusion.ExecutionContext.sql"><code class="xref py py-obj docutils literal notranslate"><span class="pre">sql</span></code></a></p></td>
 <td><p>Returns a PyDataFrame whose plan corresponds to the SQL statement.</p></td>
 </tr>
+<tr class="row-even"><td><p><a class="reference internal" href="#datafusion.ExecutionContext.table" title="datafusion.ExecutionContext.table"><code class="xref py py-obj docutils literal notranslate"><span class="pre">table</span></code></a></p></td>
+<td><p></p></td>
+</tr>
 <tr class="row-odd"><td><p><a class="reference internal" href="#datafusion.ExecutionContext.tables" title="datafusion.ExecutionContext.tables"><code class="xref py py-obj docutils literal notranslate"><span class="pre">tables</span></code></a></p></td>
 <td><p></p></td>
 </tr>
@@ -468,18 +498,29 @@ <h1>datafusion.ExecutionContext<a class="headerlink" href="#datafusion-execution
 
 </dd></dl>
 
-</div>
+</section>
 
 
               </div>
               
               
-              <div class='prev-next-bottom'>
-                
-    <a class='left-prev' id="prev-link" href="../api/execution_context.html" title="previous page">ExecutionContext</a>
-    <a class='right-next' id="next-link" href="../api/expression.html" title="next page">Expression</a>
-
-              </div>
+              <!-- Previous / next buttons -->
+<div class='prev-next-area'>
+    <a class='left-prev' id="prev-link" href="../api/execution_context.html" title="previous page">
+        <i class="fas fa-angle-left"></i>
+        <div class="prev-next-info">
+            <p class="prev-next-subtitle">previous</p>
+            <p class="prev-next-title">ExecutionContext</p>
+        </div>
+    </a>
+    <a class='right-next' id="next-link" href="../api/expression.html" title="next page">
+    <div class="prev-next-info">
+        <p class="prev-next-subtitle">next</p>
+        <p class="prev-next-title">Expression</p>
+    </div>
+    <i class="fas fa-angle-right"></i>
+    </a>
+</div>
               
           </main>
           
@@ -487,20 +528,19 @@ <h1>datafusion.ExecutionContext<a class="headerlink" href="#datafusion-execution
       </div>
     </div>
   
-  <script src="../../_static/js/index.1c5a1a01449ed65a7b51.js"></script>
-
+    <script src="../../_static/scripts/pydata-sphinx-theme.js?digest=1999514e3f237ded88cf"></script>
   <footer class="footer mt-5 mt-md-0">
   <div class="container">
     
     <div class="footer-item">
       <p class="copyright">
-    &copy; Copyright 2021, Apache Software Foundation.<br/>
+    &copy; Copyright 2021, Apache Software Foundation.<br>
 </p>
     </div>
     
     <div class="footer-item">
       <p class="sphinx-version">
-Created using <a href="http://sphinx-doc.org/">Sphinx</a> 2.4.4.<br/>
+Created using <a href="http://sphinx-doc.org/">Sphinx</a> 2.4.4.<br>
 </p>
     </div>
     
diff --git a/datafusion/python/generated/datafusion.Expression.html b/datafusion/python/generated/datafusion.Expression.html
index e980adfd6267..5b203563679b 100644
--- a/datafusion/python/generated/datafusion.Expression.html
+++ b/datafusion/python/generated/datafusion.Expression.html
@@ -3,30 +3,31 @@
 
 <html xmlns="http://www.w3.org/1999/xhtml">
   <head>
-    <meta charset="utf-8" />
+    <meta charset="utf-8" /><meta name="generator" content="Docutils 0.17.1: http://docutils.sourceforge.net/" />
+
     <title>datafusion.Expression &#8212; Arrow Datafusion  documentation</title>
     
-  <link href="../../_static/css/theme.css" rel="stylesheet" />
-  <link href="../../_static/css/index.c5995385ac14fb8791e8eb36b4908be2.css" rel="stylesheet" />
-
+    <link href="../../_static/styles/theme.css?digest=1999514e3f237ded88cf" rel="stylesheet">
+<link href="../../_static/styles/pydata-sphinx-theme.css?digest=1999514e3f237ded88cf" rel="stylesheet">
+  
     
-  <link rel="stylesheet"
-    href="../../_static/vendor/fontawesome/5.13.0/css/all.min.css">
-  <link rel="preload" as="font" type="font/woff2" crossorigin
-    href="../../_static/vendor/fontawesome/5.13.0/webfonts/fa-solid-900.woff2">
-  <link rel="preload" as="font" type="font/woff2" crossorigin
-    href="../../_static/vendor/fontawesome/5.13.0/webfonts/fa-brands-400.woff2">
-
+    <link rel="stylesheet"
+      href="../../_static/vendor/fontawesome/5.13.0/css/all.min.css">
+    <link rel="preload" as="font" type="font/woff2" crossorigin
+      href="../../_static/vendor/fontawesome/5.13.0/webfonts/fa-solid-900.woff2">
+    <link rel="preload" as="font" type="font/woff2" crossorigin
+      href="../../_static/vendor/fontawesome/5.13.0/webfonts/fa-brands-400.woff2">
+  
     
       
-
+  
     
-    <link rel="stylesheet" href="../../_static/basic.css" type="text/css" />
+    <link rel="stylesheet" href="../../_static/styles/pydata-sphinx-theme.css" type="text/css" />
     <link rel="stylesheet" href="../../_static/pygments.css" type="text/css" />
     <link rel="stylesheet" type="text/css" href="../../_static/theme_overrides.css" />
     
-  <link rel="preload" as="script" href="../../_static/js/index.1c5a1a01449ed65a7b51.js">
-
+    <link rel="preload" as="script" href="../../_static/scripts/pydata-sphinx-theme.js?digest=1999514e3f237ded88cf">
+  
     <script id="documentation_options" data-url_root="../../" src="../../_static/documentation_options.js"></script>
     <script src="../../_static/jquery.js"></script>
     <script src="../../_static/underscore.js"></script>
@@ -37,7 +38,10 @@
     <link rel="next" title="Functions" href="../api/functions.html" />
     <link rel="prev" title="Expression" href="../api/expression.html" />
     <meta name="viewport" content="width=device-width, initial-scale=1" />
-    <meta name="docsearch:language" content="en" />
+    <meta name="docsearch:language" content="None">
+    
+
+    <!-- Google Analytics -->
     
   </head>
   <body data-spy="scroll" data-target="#bd-toc-nav" data-offset="80">
@@ -53,6 +57,7 @@
             
             <!-- Only show if we have sidebars configured, else just a small margin  -->
             <div class="col-12 col-md-3 bd-sidebar">
+              <div class="sidebar-start-items">
 <a class="navbar-brand" href="../../index.html">
   <img src="../../_static/images/DataFusion-Logo-Background-White.png" class="logo" alt="logo">
 </a>
@@ -65,7 +70,7 @@
 <nav class="bd-links" id="bd-docs-nav" aria-label="Main navigation">
   <div class="bd-toc-item active">
     
-    <p class="caption">
+    <p>
  <span class="caption-text">
   Supported Environments
  </span>
@@ -126,7 +131,7 @@
   </a>
  </li>
 </ul>
-<p class="caption">
+<p>
  <span class="caption-text">
   User Guide
  </span>
@@ -162,6 +167,11 @@
    </i>
   </label>
   <ul>
+   <li class="toctree-l2">
+    <a class="reference internal" href="../../user-guide/sql/sql_status.html">
+     Status
+    </a>
+   </li>
    <li class="toctree-l2">
     <a class="reference internal" href="../../user-guide/sql/select.html">
      SELECT syntax
@@ -266,7 +276,7 @@
   </a>
  </li>
 </ul>
-<p class="caption">
+<p>
  <span class="caption-text">
   Specification
  </span>
@@ -287,8 +297,13 @@
    Datafusion output field name semantic
   </a>
  </li>
+ <li class="toctree-l1">
+  <a class="reference internal" href="../../specification/quarterly_roadmap.html">
+   Roadmap
+  </a>
+ </li>
 </ul>
-<p class="caption">
+<p>
  <span class="caption-text">
   README
  </span>
@@ -305,7 +320,7 @@
   </a>
  </li>
 </ul>
-<p class="caption">
+<p>
  <span class="caption-text">
   Community
  </span>
@@ -331,6 +346,9 @@
     
   </div>
 </nav>
+              </div>
+              <div class="sidebar-end-items">
+              </div>
             </div>
             
           
@@ -370,7 +388,7 @@
               
               <div>
                 
-  <div class="section" id="datafusion-expression">
+  <section id="datafusion-expression">
 <h1>datafusion.Expression<a class="headerlink" href="#datafusion-expression" title="Permalink to this headline">¶</a></h1>
 <dl class="class">
 <dt id="datafusion.Expression">
@@ -396,6 +414,18 @@ <h1>datafusion.Expression<a class="headerlink" href="#datafusion-expression" tit
 <tr class="row-even"><td><p><a class="reference internal" href="#datafusion.Expression.alias" title="datafusion.Expression.alias"><code class="xref py py-obj docutils literal notranslate"><span class="pre">alias</span></code></a></p></td>
 <td><p>assign a name to the PyExpr</p></td>
 </tr>
+<tr class="row-odd"><td><p><a class="reference internal" href="#datafusion.Expression.cast" title="datafusion.Expression.cast"><code class="xref py py-obj docutils literal notranslate"><span class="pre">cast</span></code></a></p></td>
+<td><p></p></td>
+</tr>
+<tr class="row-even"><td><p><a class="reference internal" href="#datafusion.Expression.column" title="datafusion.Expression.column"><code class="xref py py-obj docutils literal notranslate"><span class="pre">column</span></code></a></p></td>
+<td><p></p></td>
+</tr>
+<tr class="row-odd"><td><p><a class="reference internal" href="#datafusion.Expression.is_null" title="datafusion.Expression.is_null"><code class="xref py py-obj docutils literal notranslate"><span class="pre">is_null</span></code></a></p></td>
+<td><p></p></td>
+</tr>
+<tr class="row-even"><td><p><a class="reference internal" href="#datafusion.Expression.literal" title="datafusion.Expression.literal"><code class="xref py py-obj docutils literal notranslate"><span class="pre">literal</span></code></a></p></td>
+<td><p></p></td>
+</tr>
 <tr class="row-odd"><td><p><a class="reference internal" href="#datafusion.Expression.sort" title="datafusion.Expression.sort"><code class="xref py py-obj docutils literal notranslate"><span class="pre">sort</span></code></a></p></td>
 <td><p>Create a sort PyExpr from an existing PyExpr.</p></td>
 </tr>
@@ -435,18 +465,29 @@ <h1>datafusion.Expression<a class="headerlink" href="#datafusion-expression" tit
 
 </dd></dl>
 
-</div>
+</section>
 
 
               </div>
               
               
-              <div class='prev-next-bottom'>
-                
-    <a class='left-prev' id="prev-link" href="../api/expression.html" title="previous page">Expression</a>
-    <a class='right-next' id="next-link" href="../api/functions.html" title="next page">Functions</a>
-
-              </div>
+              <!-- Previous / next buttons -->
+<div class='prev-next-area'>
+    <a class='left-prev' id="prev-link" href="../api/expression.html" title="previous page">
+        <i class="fas fa-angle-left"></i>
+        <div class="prev-next-info">
+            <p class="prev-next-subtitle">previous</p>
+            <p class="prev-next-title">Expression</p>
+        </div>
+    </a>
+    <a class='right-next' id="next-link" href="../api/functions.html" title="next page">
+    <div class="prev-next-info">
+        <p class="prev-next-subtitle">next</p>
+        <p class="prev-next-title">Functions</p>
+    </div>
+    <i class="fas fa-angle-right"></i>
+    </a>
+</div>
               
           </main>
           
@@ -454,20 +495,19 @@ <h1>datafusion.Expression<a class="headerlink" href="#datafusion-expression" tit
       </div>
     </div>
   
-  <script src="../../_static/js/index.1c5a1a01449ed65a7b51.js"></script>
-
+    <script src="../../_static/scripts/pydata-sphinx-theme.js?digest=1999514e3f237ded88cf"></script>
   <footer class="footer mt-5 mt-md-0">
   <div class="container">
     
     <div class="footer-item">
       <p class="copyright">
-    &copy; Copyright 2021, Apache Software Foundation.<br/>
+    &copy; Copyright 2021, Apache Software Foundation.<br>
 </p>
     </div>
     
     <div class="footer-item">
       <p class="sphinx-version">
-Created using <a href="http://sphinx-doc.org/">Sphinx</a> 2.4.4.<br/>
+Created using <a href="http://sphinx-doc.org/">Sphinx</a> 2.4.4.<br>
 </p>
     </div>
     
diff --git a/datafusion/python/generated/datafusion.functions.html b/datafusion/python/generated/datafusion.functions.html
index 6229760b865b..f77ad34895f4 100644
--- a/datafusion/python/generated/datafusion.functions.html
+++ b/datafusion/python/generated/datafusion.functions.html
@@ -3,30 +3,31 @@
 
 <html xmlns="http://www.w3.org/1999/xhtml">
   <head>
-    <meta charset="utf-8" />
+    <meta charset="utf-8" /><meta name="generator" content="Docutils 0.17.1: http://docutils.sourceforge.net/" />
+
     <title>datafusion.functions &#8212; Arrow Datafusion  documentation</title>
     
-  <link href="../../_static/css/theme.css" rel="stylesheet" />
-  <link href="../../_static/css/index.c5995385ac14fb8791e8eb36b4908be2.css" rel="stylesheet" />
-
+    <link href="../../_static/styles/theme.css?digest=1999514e3f237ded88cf" rel="stylesheet">
+<link href="../../_static/styles/pydata-sphinx-theme.css?digest=1999514e3f237ded88cf" rel="stylesheet">
+  
     
-  <link rel="stylesheet"
-    href="../../_static/vendor/fontawesome/5.13.0/css/all.min.css">
-  <link rel="preload" as="font" type="font/woff2" crossorigin
-    href="../../_static/vendor/fontawesome/5.13.0/webfonts/fa-solid-900.woff2">
-  <link rel="preload" as="font" type="font/woff2" crossorigin
-    href="../../_static/vendor/fontawesome/5.13.0/webfonts/fa-brands-400.woff2">
-
+    <link rel="stylesheet"
+      href="../../_static/vendor/fontawesome/5.13.0/css/all.min.css">
+    <link rel="preload" as="font" type="font/woff2" crossorigin
+      href="../../_static/vendor/fontawesome/5.13.0/webfonts/fa-solid-900.woff2">
+    <link rel="preload" as="font" type="font/woff2" crossorigin
+      href="../../_static/vendor/fontawesome/5.13.0/webfonts/fa-brands-400.woff2">
+  
     
       
-
+  
     
-    <link rel="stylesheet" href="../../_static/basic.css" type="text/css" />
+    <link rel="stylesheet" href="../../_static/styles/pydata-sphinx-theme.css" type="text/css" />
     <link rel="stylesheet" href="../../_static/pygments.css" type="text/css" />
     <link rel="stylesheet" type="text/css" href="../../_static/theme_overrides.css" />
     
-  <link rel="preload" as="script" href="../../_static/js/index.1c5a1a01449ed65a7b51.js">
-
+    <link rel="preload" as="script" href="../../_static/scripts/pydata-sphinx-theme.js?digest=1999514e3f237ded88cf">
+  
     <script id="documentation_options" data-url_root="../../" src="../../_static/documentation_options.js"></script>
     <script src="../../_static/jquery.js"></script>
     <script src="../../_static/underscore.js"></script>
@@ -37,7 +38,10 @@
     <link rel="next" title="DataFusion Command-line" href="../../cli/index.html" />
     <link rel="prev" title="Functions" href="../api/functions.html" />
     <meta name="viewport" content="width=device-width, initial-scale=1" />
-    <meta name="docsearch:language" content="en" />
+    <meta name="docsearch:language" content="None">
+    
+
+    <!-- Google Analytics -->
     
   </head>
   <body data-spy="scroll" data-target="#bd-toc-nav" data-offset="80">
@@ -53,6 +57,7 @@
             
             <!-- Only show if we have sidebars configured, else just a small margin  -->
             <div class="col-12 col-md-3 bd-sidebar">
+              <div class="sidebar-start-items">
 <a class="navbar-brand" href="../../index.html">
   <img src="../../_static/images/DataFusion-Logo-Background-White.png" class="logo" alt="logo">
 </a>
@@ -65,7 +70,7 @@
 <nav class="bd-links" id="bd-docs-nav" aria-label="Main navigation">
   <div class="bd-toc-item active">
     
-    <p class="caption">
+    <p>
  <span class="caption-text">
   Supported Environments
  </span>
@@ -126,7 +131,7 @@
   </a>
  </li>
 </ul>
-<p class="caption">
+<p>
  <span class="caption-text">
   User Guide
  </span>
@@ -162,6 +167,11 @@
    </i>
   </label>
   <ul>
+   <li class="toctree-l2">
+    <a class="reference internal" href="../../user-guide/sql/sql_status.html">
+     Status
+    </a>
+   </li>
    <li class="toctree-l2">
     <a class="reference internal" href="../../user-guide/sql/select.html">
      SELECT syntax
@@ -266,7 +276,7 @@
   </a>
  </li>
 </ul>
-<p class="caption">
+<p>
  <span class="caption-text">
   Specification
  </span>
@@ -287,8 +297,13 @@
    Datafusion output field name semantic
   </a>
  </li>
+ <li class="toctree-l1">
+  <a class="reference internal" href="../../specification/quarterly_roadmap.html">
+   Roadmap
+  </a>
+ </li>
 </ul>
-<p class="caption">
+<p>
  <span class="caption-text">
   README
  </span>
@@ -305,7 +320,7 @@
   </a>
  </li>
 </ul>
-<p class="caption">
+<p>
  <span class="caption-text">
   Community
  </span>
@@ -331,6 +346,9 @@
     
   </div>
 </nav>
+              </div>
+              <div class="sidebar-end-items">
+              </div>
             </div>
             
           
@@ -370,227 +388,8 @@
               
               <div>
                 
-  <div class="section" id="module-datafusion.functions">
+  <section id="module-datafusion.functions">
 <span id="datafusion-functions"></span><h1>datafusion.functions<a class="headerlink" href="#module-datafusion.functions" title="Permalink to this headline">¶</a></h1>
-<p class="rubric">Functions</p>
-<table class="longtable table autosummary">
-<colgroup>
-<col style="width: 10%" />
-<col style="width: 90%" />
-</colgroup>
-<tbody>
-<tr class="row-odd"><td><p><a class="reference internal" href="#datafusion.functions.abs" title="datafusion.functions.abs"><code class="xref py py-obj docutils literal notranslate"><span class="pre">abs</span></code></a></p></td>
-<td><p></p></td>
-</tr>
-<tr class="row-even"><td><p><a class="reference internal" href="#datafusion.functions.acos" title="datafusion.functions.acos"><code class="xref py py-obj docutils literal notranslate"><span class="pre">acos</span></code></a></p></td>
-<td><p></p></td>
-</tr>
-<tr class="row-odd"><td><p><a class="reference internal" href="#datafusion.functions.array" title="datafusion.functions.array"><code class="xref py py-obj docutils literal notranslate"><span class="pre">array</span></code></a></p></td>
-<td><p></p></td>
-</tr>
-<tr class="row-even"><td><p><a class="reference internal" href="#datafusion.functions.ascii" title="datafusion.functions.ascii"><code class="xref py py-obj docutils literal notranslate"><span class="pre">ascii</span></code></a></p></td>
-<td><p>Returns the numeric code of the first character of the argument.</p></td>
-</tr>
-<tr class="row-odd"><td><p><a class="reference internal" href="#datafusion.functions.asin" title="datafusion.functions.asin"><code class="xref py py-obj docutils literal notranslate"><span class="pre">asin</span></code></a></p></td>
-<td><p></p></td>
-</tr>
-<tr class="row-even"><td><p><a class="reference internal" href="#datafusion.functions.atan" title="datafusion.functions.atan"><code class="xref py py-obj docutils literal notranslate"><span class="pre">atan</span></code></a></p></td>
-<td><p></p></td>
-</tr>
-<tr class="row-odd"><td><p><a class="reference internal" href="#datafusion.functions.avg" title="datafusion.functions.avg"><code class="xref py py-obj docutils literal notranslate"><span class="pre">avg</span></code></a></p></td>
-<td><p>This function is not documented yet</p></td>
-</tr>
-<tr class="row-even"><td><p><a class="reference internal" href="#datafusion.functions.bit_length" title="datafusion.functions.bit_length"><code class="xref py py-obj docutils literal notranslate"><span class="pre">bit_length</span></code></a></p></td>
-<td><p>Returns number of bits in the string (8 times the octet_length).</p></td>
-</tr>
-<tr class="row-odd"><td><p><a class="reference internal" href="#datafusion.functions.btrim" title="datafusion.functions.btrim"><code class="xref py py-obj docutils literal notranslate"><span class="pre">btrim</span></code></a></p></td>
-<td><p>Removes the longest string containing only characters in characters (a space by default) from the start and end of string.</p></td>
-</tr>
-<tr class="row-even"><td><p><a class="reference internal" href="#datafusion.functions.ceil" title="datafusion.functions.ceil"><code class="xref py py-obj docutils literal notranslate"><span class="pre">ceil</span></code></a></p></td>
-<td><p></p></td>
-</tr>
-<tr class="row-odd"><td><p><a class="reference internal" href="#datafusion.functions.character_length" title="datafusion.functions.character_length"><code class="xref py py-obj docutils literal notranslate"><span class="pre">character_length</span></code></a></p></td>
-<td><p>Returns number of characters in the string.</p></td>
-</tr>
-<tr class="row-even"><td><p><a class="reference internal" href="#datafusion.functions.chr" title="datafusion.functions.chr"><code class="xref py py-obj docutils literal notranslate"><span class="pre">chr</span></code></a></p></td>
-<td><p>Returns the character with the given code.</p></td>
-</tr>
-<tr class="row-odd"><td><p><a class="reference internal" href="#datafusion.functions.col" title="datafusion.functions.col"><code class="xref py py-obj docutils literal notranslate"><span class="pre">col</span></code></a></p></td>
-<td><p>Expression representing a column on the existing plan.</p></td>
-</tr>
-<tr class="row-even"><td><p><a class="reference internal" href="#datafusion.functions.concat" title="datafusion.functions.concat"><code class="xref py py-obj docutils literal notranslate"><span class="pre">concat</span></code></a></p></td>
-<td><p>Concatenates the text representations of all the arguments.</p></td>
-</tr>
-<tr class="row-odd"><td><p><a class="reference internal" href="#datafusion.functions.concat_ws" title="datafusion.functions.concat_ws"><code class="xref py py-obj docutils literal notranslate"><span class="pre">concat_ws</span></code></a></p></td>
-<td><p>Concatenates all but the first argument, with separators.</p></td>
-</tr>
-<tr class="row-even"><td><p><a class="reference internal" href="#datafusion.functions.cos" title="datafusion.functions.cos"><code class="xref py py-obj docutils literal notranslate"><span class="pre">cos</span></code></a></p></td>
-<td><p></p></td>
-</tr>
-<tr class="row-odd"><td><p><a class="reference internal" href="#datafusion.functions.count" title="datafusion.functions.count"><code class="xref py py-obj docutils literal notranslate"><span class="pre">count</span></code></a></p></td>
-<td><p>This function is not documented yet</p></td>
-</tr>
-<tr class="row-even"><td><p><a class="reference internal" href="#datafusion.functions.exp" title="datafusion.functions.exp"><code class="xref py py-obj docutils literal notranslate"><span class="pre">exp</span></code></a></p></td>
-<td><p></p></td>
-</tr>
-<tr class="row-odd"><td><p><a class="reference internal" href="#datafusion.functions.floor" title="datafusion.functions.floor"><code class="xref py py-obj docutils literal notranslate"><span class="pre">floor</span></code></a></p></td>
-<td><p></p></td>
-</tr>
-<tr class="row-even"><td><p><a class="reference internal" href="#datafusion.functions.in_list" title="datafusion.functions.in_list"><code class="xref py py-obj docutils literal notranslate"><span class="pre">in_list</span></code></a></p></td>
-<td><p></p></td>
-</tr>
-<tr class="row-odd"><td><p><a class="reference internal" href="#datafusion.functions.initcap" title="datafusion.functions.initcap"><code class="xref py py-obj docutils literal notranslate"><span class="pre">initcap</span></code></a></p></td>
-<td><p>Converts the first letter of each word to upper case and the rest to lower case.</p></td>
-</tr>
-<tr class="row-even"><td><p><a class="reference internal" href="#datafusion.functions.left" title="datafusion.functions.left"><code class="xref py py-obj docutils literal notranslate"><span class="pre">left</span></code></a></p></td>
-<td><p>Returns first n characters in the string, or when n is negative, returns all but last <a href="#id1"><span class="problematic" id="id2">|n|</span></a> characters.</p></td>
-</tr>
-<tr class="row-odd"><td><p><a class="reference internal" href="#datafusion.functions.lit" title="datafusion.functions.lit"><code class="xref py py-obj docutils literal notranslate"><span class="pre">lit</span></code></a></p></td>
-<td><p>Expression representing a constant value</p></td>
-</tr>
-<tr class="row-even"><td><p><a class="reference internal" href="#datafusion.functions.ln" title="datafusion.functions.ln"><code class="xref py py-obj docutils literal notranslate"><span class="pre">ln</span></code></a></p></td>
-<td><p></p></td>
-</tr>
-<tr class="row-odd"><td><p><a class="reference internal" href="#datafusion.functions.log10" title="datafusion.functions.log10"><code class="xref py py-obj docutils literal notranslate"><span class="pre">log10</span></code></a></p></td>
-<td><p></p></td>
-</tr>
-<tr class="row-even"><td><p><a class="reference internal" href="#datafusion.functions.log2" title="datafusion.functions.log2"><code class="xref py py-obj docutils literal notranslate"><span class="pre">log2</span></code></a></p></td>
-<td><p></p></td>
-</tr>
-<tr class="row-odd"><td><p><a class="reference internal" href="#datafusion.functions.lower" title="datafusion.functions.lower"><code class="xref py py-obj docutils literal notranslate"><span class="pre">lower</span></code></a></p></td>
-<td><p>Converts the string to all lower case</p></td>
-</tr>
-<tr class="row-even"><td><p><a class="reference internal" href="#datafusion.functions.lpad" title="datafusion.functions.lpad"><code class="xref py py-obj docutils literal notranslate"><span class="pre">lpad</span></code></a></p></td>
-<td><p>Extends the string to length length by prepending the characters fill (a space by default).</p></td>
-</tr>
-<tr class="row-odd"><td><p><a class="reference internal" href="#datafusion.functions.ltrim" title="datafusion.functions.ltrim"><code class="xref py py-obj docutils literal notranslate"><span class="pre">ltrim</span></code></a></p></td>
-<td><p>Removes the longest string containing only characters in characters (a space by default) from the start of string.</p></td>
-</tr>
-<tr class="row-even"><td><p><a class="reference internal" href="#datafusion.functions.max" title="datafusion.functions.max"><code class="xref py py-obj docutils literal notranslate"><span class="pre">max</span></code></a></p></td>
-<td><p>This function is not documented yet</p></td>
-</tr>
-<tr class="row-odd"><td><p><a class="reference internal" href="#datafusion.functions.md5" title="datafusion.functions.md5"><code class="xref py py-obj docutils literal notranslate"><span class="pre">md5</span></code></a></p></td>
-<td><p>Computes the MD5 hash of the argument, with the result written in hexadecimal.</p></td>
-</tr>
-<tr class="row-even"><td><p><a class="reference internal" href="#datafusion.functions.min" title="datafusion.functions.min"><code class="xref py py-obj docutils literal notranslate"><span class="pre">min</span></code></a></p></td>
-<td><p>This function is not documented yet</p></td>
-</tr>
-<tr class="row-odd"><td><p><a class="reference internal" href="#datafusion.functions.now" title="datafusion.functions.now"><code class="xref py py-obj docutils literal notranslate"><span class="pre">now</span></code></a></p></td>
-<td><p>Current date and time</p></td>
-</tr>
-<tr class="row-even"><td><p><a class="reference internal" href="#datafusion.functions.octet_length" title="datafusion.functions.octet_length"><code class="xref py py-obj docutils literal notranslate"><span class="pre">octet_length</span></code></a></p></td>
-<td><p>Returns number of bytes in the string.</p></td>
-</tr>
-<tr class="row-odd"><td><p><a class="reference internal" href="#datafusion.functions.random" title="datafusion.functions.random"><code class="xref py py-obj docutils literal notranslate"><span class="pre">random</span></code></a></p></td>
-<td><p>Returns a random value in the range 0.0 &lt;= x &lt; 1.0</p></td>
-</tr>
-<tr class="row-even"><td><p><a class="reference internal" href="#datafusion.functions.regexp_replace" title="datafusion.functions.regexp_replace"><code class="xref py py-obj docutils literal notranslate"><span class="pre">regexp_replace</span></code></a></p></td>
-<td><p>Replaces substring(s) matching a POSIX regular expression</p></td>
-</tr>
-<tr class="row-odd"><td><p><a class="reference internal" href="#datafusion.functions.repeat" title="datafusion.functions.repeat"><code class="xref py py-obj docutils literal notranslate"><span class="pre">repeat</span></code></a></p></td>
-<td><p>Repeats string the specified number of times.</p></td>
-</tr>
-<tr class="row-even"><td><p><a class="reference internal" href="#datafusion.functions.replace" title="datafusion.functions.replace"><code class="xref py py-obj docutils literal notranslate"><span class="pre">replace</span></code></a></p></td>
-<td><p>Replaces all occurrences in string of substring from with substring to.</p></td>
-</tr>
-<tr class="row-odd"><td><p><a class="reference internal" href="#datafusion.functions.reverse" title="datafusion.functions.reverse"><code class="xref py py-obj docutils literal notranslate"><span class="pre">reverse</span></code></a></p></td>
-<td><p>Reverses the order of the characters in the string.</p></td>
-</tr>
-<tr class="row-even"><td><p><a class="reference internal" href="#datafusion.functions.right" title="datafusion.functions.right"><code class="xref py py-obj docutils literal notranslate"><span class="pre">right</span></code></a></p></td>
-<td><p>Returns last n characters in the string, or when n is negative, returns all but first <a href="#id3"><span class="problematic" id="id4">|n|</span></a> characters.</p></td>
-</tr>
-<tr class="row-odd"><td><p><a class="reference internal" href="#datafusion.functions.round" title="datafusion.functions.round"><code class="xref py py-obj docutils literal notranslate"><span class="pre">round</span></code></a></p></td>
-<td><p></p></td>
-</tr>
-<tr class="row-even"><td><p><a class="reference internal" href="#datafusion.functions.rpad" title="datafusion.functions.rpad"><code class="xref py py-obj docutils literal notranslate"><span class="pre">rpad</span></code></a></p></td>
-<td><p>Extends the string to length length by appending the characters fill (a space by default).</p></td>
-</tr>
-<tr class="row-odd"><td><p><a class="reference internal" href="#datafusion.functions.rtrim" title="datafusion.functions.rtrim"><code class="xref py py-obj docutils literal notranslate"><span class="pre">rtrim</span></code></a></p></td>
-<td><p>Removes the longest string containing only characters in characters (a space by default) from the end of string.</p></td>
-</tr>
-<tr class="row-even"><td><p><a class="reference internal" href="#datafusion.functions.sha224" title="datafusion.functions.sha224"><code class="xref py py-obj docutils literal notranslate"><span class="pre">sha224</span></code></a></p></td>
-<td><p>This function is not documented yet</p></td>
-</tr>
-<tr class="row-odd"><td><p><a class="reference internal" href="#datafusion.functions.sha256" title="datafusion.functions.sha256"><code class="xref py py-obj docutils literal notranslate"><span class="pre">sha256</span></code></a></p></td>
-<td><p>This function is not documented yet</p></td>
-</tr>
-<tr class="row-even"><td><p><a class="reference internal" href="#datafusion.functions.sha384" title="datafusion.functions.sha384"><code class="xref py py-obj docutils literal notranslate"><span class="pre">sha384</span></code></a></p></td>
-<td><p>This function is not documented yet</p></td>
-</tr>
-<tr class="row-odd"><td><p><a class="reference internal" href="#datafusion.functions.sha512" title="datafusion.functions.sha512"><code class="xref py py-obj docutils literal notranslate"><span class="pre">sha512</span></code></a></p></td>
-<td><p>This function is not documented yet</p></td>
-</tr>
-<tr class="row-even"><td><p><a class="reference internal" href="#datafusion.functions.signum" title="datafusion.functions.signum"><code class="xref py py-obj docutils literal notranslate"><span class="pre">signum</span></code></a></p></td>
-<td><p></p></td>
-</tr>
-<tr class="row-odd"><td><p><a class="reference internal" href="#datafusion.functions.sin" title="datafusion.functions.sin"><code class="xref py py-obj docutils literal notranslate"><span class="pre">sin</span></code></a></p></td>
-<td><p></p></td>
-</tr>
-<tr class="row-even"><td><p><a class="reference internal" href="#datafusion.functions.split_part" title="datafusion.functions.split_part"><code class="xref py py-obj docutils literal notranslate"><span class="pre">split_part</span></code></a></p></td>
-<td><p>Splits string at occurrences of delimiter and returns the n’th field (counting from one).</p></td>
-</tr>
-<tr class="row-odd"><td><p><a class="reference internal" href="#datafusion.functions.sqrt" title="datafusion.functions.sqrt"><code class="xref py py-obj docutils literal notranslate"><span class="pre">sqrt</span></code></a></p></td>
-<td><p></p></td>
-</tr>
-<tr class="row-even"><td><p><a class="reference internal" href="#datafusion.functions.starts_with" title="datafusion.functions.starts_with"><code class="xref py py-obj docutils literal notranslate"><span class="pre">starts_with</span></code></a></p></td>
-<td><p>Returns true if string starts with prefix.</p></td>
-</tr>
-<tr class="row-odd"><td><p><a class="reference internal" href="#datafusion.functions.strpos" title="datafusion.functions.strpos"><code class="xref py py-obj docutils literal notranslate"><span class="pre">strpos</span></code></a></p></td>
-<td><p>Returns starting index of specified substring within string, or zero if it’s not present.</p></td>
-</tr>
-<tr class="row-even"><td><p><a class="reference internal" href="#datafusion.functions.substr" title="datafusion.functions.substr"><code class="xref py py-obj docutils literal notranslate"><span class="pre">substr</span></code></a></p></td>
-<td><p>This function is not documented yet</p></td>
-</tr>
-<tr class="row-odd"><td><p><a class="reference internal" href="#datafusion.functions.sum" title="datafusion.functions.sum"><code class="xref py py-obj docutils literal notranslate"><span class="pre">sum</span></code></a></p></td>
-<td><p>This function is not documented yet</p></td>
-</tr>
-<tr class="row-even"><td><p><a class="reference internal" href="#datafusion.functions.tan" title="datafusion.functions.tan"><code class="xref py py-obj docutils literal notranslate"><span class="pre">tan</span></code></a></p></td>
-<td><p></p></td>
-</tr>
-<tr class="row-odd"><td><p><a class="reference internal" href="#datafusion.functions.to_hex" title="datafusion.functions.to_hex"><code class="xref py py-obj docutils literal notranslate"><span class="pre">to_hex</span></code></a></p></td>
-<td><p>Converts the number to its equivalent hexadecimal representation.</p></td>
-</tr>
-<tr class="row-even"><td><p><a class="reference internal" href="#datafusion.functions.translate" title="datafusion.functions.translate"><code class="xref py py-obj docutils literal notranslate"><span class="pre">translate</span></code></a></p></td>
-<td><p>Replaces each character in string that matches a character in the from set with the corresponding character in the to set.</p></td>
-</tr>
-<tr class="row-odd"><td><p><a class="reference internal" href="#datafusion.functions.trim" title="datafusion.functions.trim"><code class="xref py py-obj docutils literal notranslate"><span class="pre">trim</span></code></a></p></td>
-<td><p>Removes the longest string containing only characters in characters (a space by default) from the start, end, or both ends (BOTH is the default) of string.</p></td>
-</tr>
-<tr class="row-even"><td><p><a class="reference internal" href="#datafusion.functions.trunc" title="datafusion.functions.trunc"><code class="xref py py-obj docutils literal notranslate"><span class="pre">trunc</span></code></a></p></td>
-<td><p></p></td>
-</tr>
-<tr class="row-odd"><td><p><a class="reference internal" href="#datafusion.functions.udaf" title="datafusion.functions.udaf"><code class="xref py py-obj docutils literal notranslate"><span class="pre">udaf</span></code></a></p></td>
-<td><p>Creates a new udf.</p></td>
-</tr>
-<tr class="row-even"><td><p><a class="reference internal" href="#datafusion.functions.udf" title="datafusion.functions.udf"><code class="xref py py-obj docutils literal notranslate"><span class="pre">udf</span></code></a></p></td>
-<td><p>Creates a new udf.</p></td>
-</tr>
-<tr class="row-odd"><td><p><a class="reference internal" href="#datafusion.functions.upper" title="datafusion.functions.upper"><code class="xref py py-obj docutils literal notranslate"><span class="pre">upper</span></code></a></p></td>
-<td><p>Converts the string to all upper case.</p></td>
-</tr>
-</tbody>
-</table>
-<dl class="class">
-<dt id="datafusion.functions.Volatility">
-<em class="property">class </em><code class="sig-prename descclassname">datafusion.functions.</code><code class="sig-name descname">Volatility</code><a class="headerlink" href="#datafusion.functions.Volatility" title="Permalink to this definition">¶</a></dt>
-<dd><p>Bases: <code class="xref py py-class docutils literal notranslate"><span class="pre">object</span></code></p>
-<dl class="method">
-<dt id="datafusion.functions.Volatility.immutable">
-<em class="property">static </em><code class="sig-name descname">immutable</code><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="headerlink" href="#datafusion.functions.Volatility.immutable" title="Permalink to this definition">¶</a></dt>
-<dd></dd></dl>
-
-<dl class="method">
-<dt id="datafusion.functions.Volatility.stable">
-<em class="property">static </em><code class="sig-name descname">stable</code><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="headerlink" href="#datafusion.functions.Volatility.stable" title="Permalink to this definition">¶</a></dt>
-<dd></dd></dl>
-
-<dl class="method">
-<dt id="datafusion.functions.Volatility.volatile">
-<em class="property">static </em><code class="sig-name descname">volatile</code><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="headerlink" href="#datafusion.functions.Volatility.volatile" title="Permalink to this definition">¶</a></dt>
-<dd></dd></dl>
-
-</dd></dl>
-
 <dl class="function">
 <dt id="datafusion.functions.abs">
 <code class="sig-prename descclassname">datafusion.functions.</code><code class="sig-name descname">abs</code><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="headerlink" href="#datafusion.functions.abs" title="Permalink to this definition">¶</a></dt>
@@ -604,7 +403,12 @@
 <dl class="function">
 <dt id="datafusion.functions.approx_distinct">
 <code class="sig-prename descclassname">datafusion.functions.</code><code class="sig-name descname">approx_distinct</code><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="headerlink" href="#datafusion.functions.approx_distinct" title="Permalink to this definition">¶</a></dt>
-<dd><p>This function is not documented yet</p>
+<dd></dd></dl>
+
+<dl class="function">
+<dt id="datafusion.functions.alias">
+<code class="sig-prename descclassname">datafusion.functions.</code><code class="sig-name descname">alias</code><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="headerlink" href="#datafusion.functions.alias" title="Permalink to this definition">¶</a></dt>
+<dd><p>Creates a new Alias expression</p>
 </dd></dl>
 
 <dl class="function">
@@ -631,8 +435,7 @@
 <dl class="function">
 <dt id="datafusion.functions.avg">
 <code class="sig-prename descclassname">datafusion.functions.</code><code class="sig-name descname">avg</code><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="headerlink" href="#datafusion.functions.avg" title="Permalink to this definition">¶</a></dt>
-<dd><p>This function is not documented yet</p>
-</dd></dl>
+<dd></dd></dl>
 
 <dl class="function">
 <dt id="datafusion.functions.bit_length">
@@ -663,12 +466,6 @@
 <dd><p>Returns the character with the given code.</p>
 </dd></dl>
 
-<dl class="function">
-<dt id="datafusion.functions.col">
-<code class="sig-prename descclassname">datafusion.functions.</code><code class="sig-name descname">col</code><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="headerlink" href="#datafusion.functions.col" title="Permalink to this definition">¶</a></dt>
-<dd><p>Expression representing a column on the existing plan.</p>
-</dd></dl>
-
 <dl class="function">
 <dt id="datafusion.functions.concat_ws">
 <code class="sig-prename descclassname">datafusion.functions.</code><code class="sig-name descname">concat_ws</code><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="headerlink" href="#datafusion.functions.concat_ws" title="Permalink to this definition">¶</a></dt>
@@ -692,7 +489,13 @@
 <dl class="function">
 <dt id="datafusion.functions.count">
 <code class="sig-prename descclassname">datafusion.functions.</code><code class="sig-name descname">count</code><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="headerlink" href="#datafusion.functions.count" title="Permalink to this definition">¶</a></dt>
-<dd><p>This function is not documented yet</p>
+<dd></dd></dl>
+
+<dl class="function">
+<dt id="datafusion.functions.digest">
+<code class="sig-prename descclassname">datafusion.functions.</code><code class="sig-name descname">digest</code><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="headerlink" href="#datafusion.functions.digest" title="Permalink to this definition">¶</a></dt>
+<dd><p>Computes a binary hash of the given data. type is the algorithm to use.
+Standard algorithms are md5, sha224, sha256, sha384, sha512, blake2s, blake2b, and blake3.</p>
 </dd></dl>
 
 <dl class="function">
@@ -719,13 +522,7 @@
 <dl class="function">
 <dt id="datafusion.functions.left">
 <code class="sig-prename descclassname">datafusion.functions.</code><code class="sig-name descname">left</code><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="headerlink" href="#datafusion.functions.left" title="Permalink to this definition">¶</a></dt>
-<dd><p>Returns first n characters in the string, or when n is negative, returns all but last <a href="#id5"><span class="problematic" id="id6">|n|</span></a> characters.</p>
-</dd></dl>
-
-<dl class="function">
-<dt id="datafusion.functions.lit">
-<code class="sig-prename descclassname">datafusion.functions.</code><code class="sig-name descname">lit</code><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="headerlink" href="#datafusion.functions.lit" title="Permalink to this definition">¶</a></dt>
-<dd><p>Expression representing a constant value</p>
+<dd><p>Returns first n characters in the string, or when n is negative, returns all but last <a href="#id1"><span class="problematic" id="id2">|n|</span></a> characters.</p>
 </dd></dl>
 
 <dl class="function">
@@ -764,8 +561,7 @@
 <dl class="function">
 <dt id="datafusion.functions.max">
 <code class="sig-prename descclassname">datafusion.functions.</code><code class="sig-name descname">max</code><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="headerlink" href="#datafusion.functions.max" title="Permalink to this definition">¶</a></dt>
-<dd><p>This function is not documented yet</p>
-</dd></dl>
+<dd></dd></dl>
 
 <dl class="function">
 <dt id="datafusion.functions.md5">
@@ -773,18 +569,10 @@
 <dd><p>Computes the MD5 hash of the argument, with the result written in hexadecimal.</p>
 </dd></dl>
 
-<dl class="function">
-<dt id="datafusion.functions.digest">
-<code class="sig-prename descclassname">datafusion.functions.</code><code class="sig-name descname">digest</code><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="headerlink" href="#datafusion.functions.digest" title="Permalink to this definition">¶</a></dt>
-<dd><p>Computes a binary hash of the given data. type is the algorithm to use.
-Standard algorithms are md5, sha224, sha256, sha384, sha512, blake2s, blake2b, and blake3.</p>
-</dd></dl>
-
 <dl class="function">
 <dt id="datafusion.functions.min">
 <code class="sig-prename descclassname">datafusion.functions.</code><code class="sig-name descname">min</code><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="headerlink" href="#datafusion.functions.min" title="Permalink to this definition">¶</a></dt>
-<dd><p>This function is not documented yet</p>
-</dd></dl>
+<dd></dd></dl>
 
 <dl class="function">
 <dt id="datafusion.functions.now">
@@ -798,12 +586,23 @@
 <dd><p>Returns number of bytes in the string. Since this version of the function accepts type character directly, it will not strip trailing spaces.</p>
 </dd></dl>
 
+<dl class="function">
+<dt id="datafusion.functions.order_by">
+<code class="sig-prename descclassname">datafusion.functions.</code><code class="sig-name descname">order_by</code><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="headerlink" href="#datafusion.functions.order_by" title="Permalink to this definition">¶</a></dt>
+<dd><p>Creates a new Sort expression</p>
+</dd></dl>
+
 <dl class="function">
 <dt id="datafusion.functions.random">
 <code class="sig-prename descclassname">datafusion.functions.</code><code class="sig-name descname">random</code><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="headerlink" href="#datafusion.functions.random" title="Permalink to this definition">¶</a></dt>
 <dd><p>Returns a random value in the range 0.0 &lt;= x &lt; 1.0</p>
 </dd></dl>
 
+<dl class="function">
+<dt id="datafusion.functions.regexp_match">
+<code class="sig-prename descclassname">datafusion.functions.</code><code class="sig-name descname">regexp_match</code><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="headerlink" href="#datafusion.functions.regexp_match" title="Permalink to this definition">¶</a></dt>
+<dd></dd></dl>
+
 <dl class="function">
 <dt id="datafusion.functions.regexp_replace">
 <code class="sig-prename descclassname">datafusion.functions.</code><code class="sig-name descname">regexp_replace</code><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="headerlink" href="#datafusion.functions.regexp_replace" title="Permalink to this definition">¶</a></dt>
@@ -831,7 +630,7 @@
 <dl class="function">
 <dt id="datafusion.functions.right">
 <code class="sig-prename descclassname">datafusion.functions.</code><code class="sig-name descname">right</code><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="headerlink" href="#datafusion.functions.right" title="Permalink to this definition">¶</a></dt>
-<dd><p>Returns last n characters in the string, or when n is negative, returns all but first <a href="#id7"><span class="problematic" id="id8">|n|</span></a> characters.</p>
+<dd><p>Returns last n characters in the string, or when n is negative, returns all but first <a href="#id3"><span class="problematic" id="id4">|n|</span></a> characters.</p>
 </dd></dl>
 
 <dl class="function">
@@ -854,26 +653,22 @@
 <dl class="function">
 <dt id="datafusion.functions.sha224">
 <code class="sig-prename descclassname">datafusion.functions.</code><code class="sig-name descname">sha224</code><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="headerlink" href="#datafusion.functions.sha224" title="Permalink to this definition">¶</a></dt>
-<dd><p>This function is not documented yet</p>
-</dd></dl>
+<dd></dd></dl>
 
 <dl class="function">
 <dt id="datafusion.functions.sha256">
 <code class="sig-prename descclassname">datafusion.functions.</code><code class="sig-name descname">sha256</code><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="headerlink" href="#datafusion.functions.sha256" title="Permalink to this definition">¶</a></dt>
-<dd><p>This function is not documented yet</p>
-</dd></dl>
+<dd></dd></dl>
 
 <dl class="function">
 <dt id="datafusion.functions.sha384">
 <code class="sig-prename descclassname">datafusion.functions.</code><code class="sig-name descname">sha384</code><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="headerlink" href="#datafusion.functions.sha384" title="Permalink to this definition">¶</a></dt>
-<dd><p>This function is not documented yet</p>
-</dd></dl>
+<dd></dd></dl>
 
 <dl class="function">
 <dt id="datafusion.functions.sha512">
 <code class="sig-prename descclassname">datafusion.functions.</code><code class="sig-name descname">sha512</code><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="headerlink" href="#datafusion.functions.sha512" title="Permalink to this definition">¶</a></dt>
-<dd><p>This function is not documented yet</p>
-</dd></dl>
+<dd></dd></dl>
 
 <dl class="function">
 <dt id="datafusion.functions.signum">
@@ -911,14 +706,12 @@
 <dl class="function">
 <dt id="datafusion.functions.substr">
 <code class="sig-prename descclassname">datafusion.functions.</code><code class="sig-name descname">substr</code><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="headerlink" href="#datafusion.functions.substr" title="Permalink to this definition">¶</a></dt>
-<dd><p>This function is not documented yet</p>
-</dd></dl>
+<dd></dd></dl>
 
 <dl class="function">
 <dt id="datafusion.functions.sum">
 <code class="sig-prename descclassname">datafusion.functions.</code><code class="sig-name descname">sum</code><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="headerlink" href="#datafusion.functions.sum" title="Permalink to this definition">¶</a></dt>
-<dd><p>This function is not documented yet</p>
-</dd></dl>
+<dd></dd></dl>
 
 <dl class="function">
 <dt id="datafusion.functions.tan">
@@ -931,6 +724,11 @@
 <dd><p>Converts the number to its equivalent hexadecimal representation.</p>
 </dd></dl>
 
+<dl class="function">
+<dt id="datafusion.functions.to_timestamp">
+<code class="sig-prename descclassname">datafusion.functions.</code><code class="sig-name descname">to_timestamp</code><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="headerlink" href="#datafusion.functions.to_timestamp" title="Permalink to this definition">¶</a></dt>
+<dd></dd></dl>
+
 <dl class="function">
 <dt id="datafusion.functions.translate">
 <code class="sig-prename descclassname">datafusion.functions.</code><code class="sig-name descname">translate</code><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="headerlink" href="#datafusion.functions.translate" title="Permalink to this definition">¶</a></dt>
@@ -948,36 +746,41 @@
 <code class="sig-prename descclassname">datafusion.functions.</code><code class="sig-name descname">trunc</code><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="headerlink" href="#datafusion.functions.trunc" title="Permalink to this definition">¶</a></dt>
 <dd></dd></dl>
 
-<dl class="function">
-<dt id="datafusion.functions.udaf">
-<code class="sig-prename descclassname">datafusion.functions.</code><code class="sig-name descname">udaf</code><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="headerlink" href="#datafusion.functions.udaf" title="Permalink to this definition">¶</a></dt>
-<dd><p>Creates a new udf.</p>
-</dd></dl>
-
-<dl class="function">
-<dt id="datafusion.functions.udf">
-<code class="sig-prename descclassname">datafusion.functions.</code><code class="sig-name descname">udf</code><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="headerlink" href="#datafusion.functions.udf" title="Permalink to this definition">¶</a></dt>
-<dd><p>Creates a new udf.</p>
-</dd></dl>
-
 <dl class="function">
 <dt id="datafusion.functions.upper">
 <code class="sig-prename descclassname">datafusion.functions.</code><code class="sig-name descname">upper</code><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="headerlink" href="#datafusion.functions.upper" title="Permalink to this definition">¶</a></dt>
 <dd><p>Converts the string to all upper case.</p>
 </dd></dl>
 
-</div>
+<dl class="function">
+<dt id="datafusion.functions.window">
+<code class="sig-prename descclassname">datafusion.functions.</code><code class="sig-name descname">window</code><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="headerlink" href="#datafusion.functions.window" title="Permalink to this definition">¶</a></dt>
+<dd><p>Creates a new Window function expression</p>
+</dd></dl>
+
+</section>
 
 
               </div>
               
               
-              <div class='prev-next-bottom'>
-                
-    <a class='left-prev' id="prev-link" href="../api/functions.html" title="previous page">Functions</a>
-    <a class='right-next' id="next-link" href="../../cli/index.html" title="next page">DataFusion Command-line</a>
-
-              </div>
+              <!-- Previous / next buttons -->
+<div class='prev-next-area'>
+    <a class='left-prev' id="prev-link" href="../api/functions.html" title="previous page">
+        <i class="fas fa-angle-left"></i>
+        <div class="prev-next-info">
+            <p class="prev-next-subtitle">previous</p>
+            <p class="prev-next-title">Functions</p>
+        </div>
+    </a>
+    <a class='right-next' id="next-link" href="../../cli/index.html" title="next page">
+    <div class="prev-next-info">
+        <p class="prev-next-subtitle">next</p>
+        <p class="prev-next-title">DataFusion Command-line</p>
+    </div>
+    <i class="fas fa-angle-right"></i>
+    </a>
+</div>
               
           </main>
           
@@ -985,20 +788,19 @@
       </div>
     </div>
   
-  <script src="../../_static/js/index.1c5a1a01449ed65a7b51.js"></script>
-
+    <script src="../../_static/scripts/pydata-sphinx-theme.js?digest=1999514e3f237ded88cf"></script>
   <footer class="footer mt-5 mt-md-0">
   <div class="container">
     
     <div class="footer-item">
       <p class="copyright">
-    &copy; Copyright 2021, Apache Software Foundation.<br/>
+    &copy; Copyright 2021, Apache Software Foundation.<br>
 </p>
     </div>
     
     <div class="footer-item">
       <p class="sphinx-version">
-Created using <a href="http://sphinx-doc.org/">Sphinx</a> 2.4.4.<br/>
+Created using <a href="http://sphinx-doc.org/">Sphinx</a> 2.4.4.<br>
 </p>
     </div>
     
diff --git a/datafusion/python/index.html b/datafusion/python/index.html
index 51ba5d628f01..57784b93f685 100644
--- a/datafusion/python/index.html
+++ b/datafusion/python/index.html
@@ -3,30 +3,31 @@
 
 <html xmlns="http://www.w3.org/1999/xhtml">
   <head>
-    <meta charset="utf-8" />
+    <meta charset="utf-8" /><meta name="generator" content="Docutils 0.17.1: http://docutils.sourceforge.net/" />
+
     <title>DataFusion in Python &#8212; Arrow Datafusion  documentation</title>
     
-  <link href="../_static/css/theme.css" rel="stylesheet" />
-  <link href="../_static/css/index.c5995385ac14fb8791e8eb36b4908be2.css" rel="stylesheet" />
-
+    <link href="../_static/styles/theme.css?digest=1999514e3f237ded88cf" rel="stylesheet">
+<link href="../_static/styles/pydata-sphinx-theme.css?digest=1999514e3f237ded88cf" rel="stylesheet">
+  
     
-  <link rel="stylesheet"
-    href="../_static/vendor/fontawesome/5.13.0/css/all.min.css">
-  <link rel="preload" as="font" type="font/woff2" crossorigin
-    href="../_static/vendor/fontawesome/5.13.0/webfonts/fa-solid-900.woff2">
-  <link rel="preload" as="font" type="font/woff2" crossorigin
-    href="../_static/vendor/fontawesome/5.13.0/webfonts/fa-brands-400.woff2">
-
+    <link rel="stylesheet"
+      href="../_static/vendor/fontawesome/5.13.0/css/all.min.css">
+    <link rel="preload" as="font" type="font/woff2" crossorigin
+      href="../_static/vendor/fontawesome/5.13.0/webfonts/fa-solid-900.woff2">
+    <link rel="preload" as="font" type="font/woff2" crossorigin
+      href="../_static/vendor/fontawesome/5.13.0/webfonts/fa-brands-400.woff2">
+  
     
       
-
+  
     
-    <link rel="stylesheet" href="../_static/basic.css" type="text/css" />
+    <link rel="stylesheet" href="../_static/styles/pydata-sphinx-theme.css" type="text/css" />
     <link rel="stylesheet" href="../_static/pygments.css" type="text/css" />
     <link rel="stylesheet" type="text/css" href="../_static/theme_overrides.css" />
     
-  <link rel="preload" as="script" href="../_static/js/index.1c5a1a01449ed65a7b51.js">
-
+    <link rel="preload" as="script" href="../_static/scripts/pydata-sphinx-theme.js?digest=1999514e3f237ded88cf">
+  
     <script id="documentation_options" data-url_root="../" src="../_static/documentation_options.js"></script>
     <script src="../_static/jquery.js"></script>
     <script src="../_static/underscore.js"></script>
@@ -37,7 +38,10 @@
     <link rel="next" title="API Reference" href="api.html" />
     <link rel="prev" title="Apache Arrow Datafusion" href="../index.html" />
     <meta name="viewport" content="width=device-width, initial-scale=1" />
-    <meta name="docsearch:language" content="en" />
+    <meta name="docsearch:language" content="None">
+    
+
+    <!-- Google Analytics -->
     
   </head>
   <body data-spy="scroll" data-target="#bd-toc-nav" data-offset="80">
@@ -53,6 +57,7 @@
             
             <!-- Only show if we have sidebars configured, else just a small margin  -->
             <div class="col-12 col-md-3 bd-sidebar">
+              <div class="sidebar-start-items">
 <a class="navbar-brand" href="../index.html">
   <img src="../_static/images/DataFusion-Logo-Background-White.png" class="logo" alt="logo">
 </a>
@@ -65,7 +70,7 @@
 <nav class="bd-links" id="bd-docs-nav" aria-label="Main navigation">
   <div class="bd-toc-item active">
     
-    <p class="caption">
+    <p>
  <span class="caption-text">
   Supported Environments
  </span>
@@ -174,7 +179,7 @@
   </a>
  </li>
 </ul>
-<p class="caption">
+<p>
  <span class="caption-text">
   User Guide
  </span>
@@ -210,6 +215,11 @@
    </i>
   </label>
   <ul>
+   <li class="toctree-l2">
+    <a class="reference internal" href="../user-guide/sql/sql_status.html">
+     Status
+    </a>
+   </li>
    <li class="toctree-l2">
     <a class="reference internal" href="../user-guide/sql/select.html">
      SELECT syntax
@@ -314,7 +324,7 @@
   </a>
  </li>
 </ul>
-<p class="caption">
+<p>
  <span class="caption-text">
   Specification
  </span>
@@ -335,8 +345,13 @@
    Datafusion output field name semantic
   </a>
  </li>
+ <li class="toctree-l1">
+  <a class="reference internal" href="../specification/quarterly_roadmap.html">
+   Roadmap
+  </a>
+ </li>
 </ul>
-<p class="caption">
+<p>
  <span class="caption-text">
   README
  </span>
@@ -353,7 +368,7 @@
   </a>
  </li>
 </ul>
-<p class="caption">
+<p>
  <span class="caption-text">
   Community
  </span>
@@ -379,6 +394,9 @@
     
   </div>
 </nav>
+              </div>
+              <div class="sidebar-end-items">
+              </div>
             </div>
             
           
@@ -460,7 +478,7 @@
               
               <div>
                 
-  <div class="section" id="datafusion-in-python">
+  <section id="datafusion-in-python">
 <h1>DataFusion in Python<a class="headerlink" href="#datafusion-in-python" title="Permalink to this headline">¶</a></h1>
 <p>This is a Python library that binds to <a class="reference external" href="https://arrow.apache.org/">Apache Arrow</a> in-memory query engine <a class="reference external" href="https://github.com/apache/arrow/tree/master/rust/datafusion">DataFusion</a>.</p>
 <p>Like pyspark, it allows you to build a plan through SQL or a DataFrame API against in-memory data, parquet or CSV files, run it in a multi-threaded environment, and obtain the result back in Python.</p>
@@ -468,7 +486,7 @@ <h1>DataFusion in Python<a class="headerlink" href="#datafusion-in-python" title
 <p>The major advantage of this library over other execution engines is that this library achieves zero-copy between Python and its execution engine: there is no cost in using UDFs, UDAFs, and collecting the results to Python apart from having to lock the GIL when running those operations.</p>
 <p>Its query engine, DataFusion, is written in <a class="reference external" href="https://www.rust-lang.org">Rust</a>), which makes strong assumptions about thread safety and lack of memory leaks.</p>
 <p>Technically, zero-copy is achieved via the <a class="reference external" href="https://arrow.apache.org/docs/format/CDataInterface.html">c data interface</a>.</p>
-<div class="section" id="how-to-use-it">
+<section id="how-to-use-it">
 <h2>How to use it<a class="headerlink" href="#how-to-use-it" title="Permalink to this headline">¶</a></h2>
 <p>Simple usage:</p>
 <div class="highlight-python notranslate"><div class="highlight"><pre><span></span><span class="kn">import</span> <span class="nn">datafusion</span>
@@ -499,7 +517,7 @@ <h2>How to use it<a class="headerlink" href="#how-to-use-it" title="Permalink to
 <span class="k">assert</span> <span class="n">result</span><span class="o">.</span><span class="n">column</span><span class="p">(</span><span class="mi">1</span><span class="p">)</span> <span class="o">==</span> <span class="n">pyarrow</span><span class="o">.</span><span class="n">array</span><span class="p">([</span><span class="o">-</span><span class="mi">3</span><span class="p">,</span> <span class="o">-</span><span class="mi">3</span><span class="p">,</span> <span class="o">-</span><span class="mi">3</span><span class="p">])</span>
 </pre></div>
 </div>
-<div class="section" id="udfs">
+<section id="udfs">
 <h3>UDFs<a class="headerlink" href="#udfs" title="Permalink to this headline">¶</a></h3>
 <div class="highlight-python notranslate"><div class="highlight"><pre><span></span><span class="k">def</span> <span class="nf">is_null</span><span class="p">(</span><span class="n">array</span><span class="p">:</span> <span class="n">pyarrow</span><span class="o">.</span><span class="n">Array</span><span class="p">)</span> <span class="o">-&gt;</span> <span class="n">pyarrow</span><span class="o">.</span><span class="n">Array</span><span class="p">:</span>
     <span class="k">return</span> <span class="n">array</span><span class="o">.</span><span class="n">is_null</span><span class="p">()</span>
@@ -509,8 +527,8 @@ <h3>UDFs<a class="headerlink" href="#udfs" title="Permalink to this headline">¶
 <span class="n">df</span> <span class="o">=</span> <span class="n">df</span><span class="o">.</span><span class="n">select</span><span class="p">(</span><span class="n">udf</span><span class="p">(</span><span class="n">col</span><span class="p">(</span><span class="s2">&quot;a&quot;</span><span class="p">)))</span>
 </pre></div>
 </div>
-</div>
-<div class="section" id="udaf">
+</section>
+<section id="udaf">
 <h3>UDAF<a class="headerlink" href="#udaf" title="Permalink to this headline">¶</a></h3>
 <div class="highlight-python notranslate"><div class="highlight"><pre><span></span><span class="kn">import</span> <span class="nn">pyarrow</span>
 <span class="kn">import</span> <span class="nn">pyarrow.compute</span>
@@ -548,15 +566,15 @@ <h3>UDAF<a class="headerlink" href="#udaf" title="Permalink to this headline">¶
 <span class="p">)</span>
 </pre></div>
 </div>
-</div>
-</div>
-<div class="section" id="how-to-install-from-pip">
+</section>
+</section>
+<section id="how-to-install-from-pip">
 <h2>How to install (from pip)<a class="headerlink" href="#how-to-install-from-pip" title="Permalink to this headline">¶</a></h2>
 <div class="highlight-shell notranslate"><div class="highlight"><pre><span></span>pip install datafusion
 </pre></div>
 </div>
-</div>
-<div class="section" id="how-to-develop">
+</section>
+<section id="how-to-develop">
 <h2>How to develop<a class="headerlink" href="#how-to-develop" title="Permalink to this headline">¶</a></h2>
 <p>This assumes that you have rust and cargo installed. We use the workflow recommended by <a class="reference external" href="https://github.com/PyO3/pyo3">pyo3</a> and <a class="reference external" href="https://github.com/PyO3/maturin">maturin</a>.</p>
 <p>Bootstrap:</p>
@@ -578,8 +596,8 @@ <h2>How to develop<a class="headerlink" href="#how-to-develop" title="Permalink
 python -m pytest
 </pre></div>
 </div>
-</div>
-<div class="section" id="how-to-update-dependencies">
+</section>
+<section id="how-to-update-dependencies">
 <h2>How to update dependencies<a class="headerlink" href="#how-to-update-dependencies" title="Permalink to this headline">¶</a></h2>
 <p>To change test dependencies, change the <cite>requirements.in</cite> and run</p>
 <div class="highlight-shell notranslate"><div class="highlight"><pre><span></span><span class="c1"># install pip-tools (this can be done only once), also consider running in venv</span>
@@ -594,8 +612,8 @@ <h2>How to update dependencies<a class="headerlink" href="#how-to-update-depende
 </pre></div>
 </div>
 <p>More details about pip-tools <a class="reference external" href="https://github.com/jazzband/pip-tools">here</a></p>
-</div>
-<div class="section" id="api-reference">
+</section>
+<section id="api-reference">
 <h2>API reference<a class="headerlink" href="#api-reference" title="Permalink to this headline">¶</a></h2>
 <div class="toctree-wrapper compound">
 <ul>
@@ -608,19 +626,30 @@ <h2>API reference<a class="headerlink" href="#api-reference" title="Permalink to
 </li>
 </ul>
 </div>
-</div>
-</div>
+</section>
+</section>
 
 
               </div>
               
               
-              <div class='prev-next-bottom'>
-                
-    <a class='left-prev' id="prev-link" href="../index.html" title="previous page">Apache Arrow Datafusion</a>
-    <a class='right-next' id="next-link" href="api.html" title="next page">API Reference</a>
-
-              </div>
+              <!-- Previous / next buttons -->
+<div class='prev-next-area'>
+    <a class='left-prev' id="prev-link" href="../index.html" title="previous page">
+        <i class="fas fa-angle-left"></i>
+        <div class="prev-next-info">
+            <p class="prev-next-subtitle">previous</p>
+            <p class="prev-next-title">Apache Arrow Datafusion</p>
+        </div>
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+    <a class='right-next' id="next-link" href="api.html" title="next page">
+    <div class="prev-next-info">
+        <p class="prev-next-subtitle">next</p>
+        <p class="prev-next-title">API Reference</p>
+    </div>
+    <i class="fas fa-angle-right"></i>
+    </a>
+</div>
               
           </main>
           
@@ -628,20 +657,19 @@ <h2>API reference<a class="headerlink" href="#api-reference" title="Permalink to
       </div>
     </div>
   
-  <script src="../_static/js/index.1c5a1a01449ed65a7b51.js"></script>
-
+    <script src="../_static/scripts/pydata-sphinx-theme.js?digest=1999514e3f237ded88cf"></script>
   <footer class="footer mt-5 mt-md-0">
   <div class="container">
     
     <div class="footer-item">
       <p class="copyright">
-    &copy; Copyright 2021, Apache Software Foundation.<br/>
+    &copy; Copyright 2021, Apache Software Foundation.<br>
 </p>
     </div>
     
     <div class="footer-item">
       <p class="sphinx-version">
-Created using <a href="http://sphinx-doc.org/">Sphinx</a> 2.4.4.<br/>
+Created using <a href="http://sphinx-doc.org/">Sphinx</a> 2.4.4.<br>
 </p>
     </div>
     
diff --git a/datafusion/search.html b/datafusion/search.html
index ff49897b9f83..2bc415c43d12 100644
--- a/datafusion/search.html
+++ b/datafusion/search.html
@@ -6,27 +6,27 @@
     <meta charset="utf-8" />
     <title>Search &#8212; Arrow Datafusion  documentation</title>
     
-  <link href="_static/css/theme.css" rel="stylesheet" />
-  <link href="_static/css/index.c5995385ac14fb8791e8eb36b4908be2.css" rel="stylesheet" />
-
+    <link href="_static/styles/theme.css?digest=1999514e3f237ded88cf" rel="stylesheet">
+<link href="_static/styles/pydata-sphinx-theme.css?digest=1999514e3f237ded88cf" rel="stylesheet">
+  
     
-  <link rel="stylesheet"
-    href="_static/vendor/fontawesome/5.13.0/css/all.min.css">
-  <link rel="preload" as="font" type="font/woff2" crossorigin
-    href="_static/vendor/fontawesome/5.13.0/webfonts/fa-solid-900.woff2">
-  <link rel="preload" as="font" type="font/woff2" crossorigin
-    href="_static/vendor/fontawesome/5.13.0/webfonts/fa-brands-400.woff2">
-
+    <link rel="stylesheet"
+      href="_static/vendor/fontawesome/5.13.0/css/all.min.css">
+    <link rel="preload" as="font" type="font/woff2" crossorigin
+      href="_static/vendor/fontawesome/5.13.0/webfonts/fa-solid-900.woff2">
+    <link rel="preload" as="font" type="font/woff2" crossorigin
+      href="_static/vendor/fontawesome/5.13.0/webfonts/fa-brands-400.woff2">
+  
     
       
-
+  
     
-    <link rel="stylesheet" href="_static/basic.css" type="text/css" />
+    <link rel="stylesheet" href="_static/styles/pydata-sphinx-theme.css" type="text/css" />
     <link rel="stylesheet" href="_static/pygments.css" type="text/css" />
     <link rel="stylesheet" type="text/css" href="_static/theme_overrides.css" />
     
-  <link rel="preload" as="script" href="_static/js/index.1c5a1a01449ed65a7b51.js">
-
+    <link rel="preload" as="script" href="_static/scripts/pydata-sphinx-theme.js?digest=1999514e3f237ded88cf">
+  
     
     <script id="documentation_options" data-url_root="./" src="_static/documentation_options.js"></script>
     <script src="_static/jquery.js"></script>
@@ -39,7 +39,10 @@
   <script src="searchindex.js" defer></script>
   
     <meta name="viewport" content="width=device-width, initial-scale=1" />
-    <meta name="docsearch:language" content="en" />
+    <meta name="docsearch:language" content="None">
+    
+
+    <!-- Google Analytics -->
     
 
   </head>
@@ -56,6 +59,7 @@
             
             <!-- Only show if we have sidebars configured, else just a small margin  -->
             <div class="col-12 col-md-3 bd-sidebar">
+              <div class="sidebar-start-items">
 <a class="navbar-brand" href="index.html">
   <img src="_static/images/DataFusion-Logo-Background-White.png" class="logo" alt="logo">
 </a>
@@ -68,7 +72,7 @@
 <nav class="bd-links" id="bd-docs-nav" aria-label="Main navigation">
   <div class="bd-toc-item active">
     
-    <p class="caption">
+    <p>
  <span class="caption-text">
   Supported Environments
  </span>
@@ -177,7 +181,7 @@
   </a>
  </li>
 </ul>
-<p class="caption">
+<p>
  <span class="caption-text">
   User Guide
  </span>
@@ -213,6 +217,11 @@
    </i>
   </label>
   <ul>
+   <li class="toctree-l2">
+    <a class="reference internal" href="user-guide/sql/sql_status.html">
+     Status
+    </a>
+   </li>
    <li class="toctree-l2">
     <a class="reference internal" href="user-guide/sql/select.html">
      SELECT syntax
@@ -317,7 +326,7 @@
   </a>
  </li>
 </ul>
-<p class="caption">
+<p>
  <span class="caption-text">
   Specification
  </span>
@@ -338,8 +347,13 @@
    Datafusion output field name semantic
   </a>
  </li>
+ <li class="toctree-l1">
+  <a class="reference internal" href="specification/quarterly_roadmap.html">
+   Roadmap
+  </a>
+ </li>
 </ul>
-<p class="caption">
+<p>
  <span class="caption-text">
   README
  </span>
@@ -356,7 +370,7 @@
   </a>
  </li>
 </ul>
-<p class="caption">
+<p>
  <span class="caption-text">
   Community
  </span>
@@ -382,6 +396,9 @@
     
   </div>
 </nav>
+              </div>
+              <div class="sidebar-end-items">
+              </div>
             </div>
             
           
@@ -427,10 +444,9 @@ <h1 id="search-documentation">Search</h1>
               </div>
               
               
-              <div class='prev-next-bottom'>
-                
-
-              </div>
+              <!-- Previous / next buttons -->
+<div class='prev-next-area'>
+</div>
               
           </main>
           
@@ -438,20 +454,19 @@ <h1 id="search-documentation">Search</h1>
       </div>
     </div>
   
-  <script src="_static/js/index.1c5a1a01449ed65a7b51.js"></script>
-
+    <script src="_static/scripts/pydata-sphinx-theme.js?digest=1999514e3f237ded88cf"></script>
   <footer class="footer mt-5 mt-md-0">
   <div class="container">
     
     <div class="footer-item">
       <p class="copyright">
-    &copy; Copyright 2021, Apache Software Foundation.<br/>
+    &copy; Copyright 2021, Apache Software Foundation.<br>
 </p>
     </div>
     
     <div class="footer-item">
       <p class="sphinx-version">
-Created using <a href="http://sphinx-doc.org/">Sphinx</a> 2.4.4.<br/>
+Created using <a href="http://sphinx-doc.org/">Sphinx</a> 2.4.4.<br>
 </p>
     </div>
     
diff --git a/datafusion/searchindex.js b/datafusion/searchindex.js
index e871585910be..ff24006c49c4 100644
--- a/datafusion/searchindex.js
+++ b/datafusion/searchindex.js
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Command-line","Communication","Apache Arrow Datafusion","API Reference","DataFrame","ExecutionContext","Expression","Functions","datafusion.DataFrame","datafusion.ExecutionContext","datafusion.Expression","datafusion.functions","DataFusion in Python","DataFusion\u2019s Invariants","Datafusion output field name semantic","Roadmap","Background","Roadmap","DataFusion Command-line Interface","Clients","Python","Ballista Rust Client","Deploying a standalone Ballista cluster using cargo install","Configuration","Starting a Ballista cluster using Docker","Starting a Ballista cluster using Docker Compose","Start a Ballista Cluster","Deploying Ballista with Kubernetes","Running Ballista on Raspberry Pi","Ballista Distributed Compute","Overview","Example Usage","Frequently Asked Questions","Introduction","Using DataFusion as a library","Datafusion-Specific Functions","DDL","SQL Reference","SELECT 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\ No newline at end of file
diff --git a/datafusion/specification/invariants.html b/datafusion/specification/invariants.html
index ce02505953cd..7ec5e8d95c94 100644
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@@ -3,30 +3,31 @@
 
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@@ -65,7 +70,7 @@
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@@ -330,8 +345,13 @@
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@@ -643,13 +671,13 @@
   specific language governing permissions and limitations
   under the License.
 -->
-<div class="section" id="datafusion-s-invariants">
+<section id="datafusion-s-invariants">
 <h1>DataFusion’s Invariants<a class="headerlink" href="#datafusion-s-invariants" title="Permalink to this headline">¶</a></h1>
 <p>This document enumerates invariants of DataFusion’s logical and physical planes
 (functions, and nodes). Some of these invariants are currently not enforced.
 This document assumes that the reader is familiar with some of the codebase,
 including rust arrow’s RecordBatch and Array.</p>
-<div class="section" id="rational">
+<section id="rational">
 <h2>Rational<a class="headerlink" href="#rational" title="Permalink to this headline">¶</a></h2>
 <p>DataFusion’s computational model is built on top of a dynamically typed arrow
 object, Array, that offers the interface <code class="docutils literal notranslate"><span class="pre">Array::as_any</span></code> to downcast itself to
@@ -663,8 +691,8 @@ <h2>Rational<a class="headerlink" href="#rational" title="Permalink to this head
 invariances. This document declares some of these invariants, so that users
 know what they can expect from a query in DataFusion, and DataFusion developers
 know what they need to enforce at the coding level.</p>
-</div>
-<div class="section" id="notation">
+</section>
+<section id="notation">
 <h2>Notation<a class="headerlink" href="#notation" title="Permalink to this headline">¶</a></h2>
 <ul class="simple">
 <li><p>Field or physical field: the tuple name, <code class="docutils literal notranslate"><span class="pre">arrow::DataType</span></code> and nullability flag (a bool whether values can be null), represented in this document by <code class="docutils literal notranslate"><span class="pre">PF(name,</span> <span class="pre">type,</span> <span class="pre">nullable)</span></code></p></li>
@@ -673,9 +701,9 @@ <h2>Notation<a class="headerlink" href="#notation" title="Permalink to this head
 <li><p>Logical schema: a vector of logical fields, used by logical plan.</p></li>
 <li><p>Physical schema: a vector of physical fields, used by both physical plan and Arrow record batch.</p></li>
 </ul>
-<div class="section" id="logical">
+<section id="logical">
 <h3>Logical<a class="headerlink" href="#logical" title="Permalink to this headline">¶</a></h3>
-<div class="section" id="function">
+<section id="function">
 <h4>Function<a class="headerlink" href="#function" title="Permalink to this headline">¶</a></h4>
 <p>An object that knows its valid incoming logical fields and how to derive its
 output logical field from its arguments’ logical fields. A functions’ output
@@ -688,22 +716,22 @@ <h4>Function<a class="headerlink" href="#function" title="Permalink to this head
 <li><p><code class="docutils literal notranslate"><span class="pre">plus(a,b)</span> <span class="pre">-&gt;</span> <span class="pre">LF(None,</span> <span class="pre">&quot;{a}</span> <span class="pre">Plus</span> <span class="pre">{b}&quot;,</span> <span class="pre">d(a.type,b.type),</span> <span class="pre">a.nullable</span> <span class="pre">|</span> <span class="pre">b.nullable)</span></code> where d is the function mapping input types to output type (<code class="docutils literal notranslate"><span class="pre">get_supertype</span></code> in our current implementation).</p></li>
 <li><p><code class="docutils literal notranslate"><span class="pre">length(a)</span> <span class="pre">-&gt;</span> <span class="pre">LF(None,</span> <span class="pre">&quot;length({a})&quot;,</span> <span class="pre">u32,</span> <span class="pre">a.nullable)</span></code></p></li>
 </ul>
-</div>
-<div class="section" id="plan">
+</section>
+<section id="plan">
 <h4>Plan<a class="headerlink" href="#plan" title="Permalink to this headline">¶</a></h4>
 <p>A tree composed of other plans and functions (e.g. <code class="docutils literal notranslate"><span class="pre">Projection</span> <span class="pre">c1</span> <span class="pre">+</span> <span class="pre">c2,</span> <span class="pre">c1</span> <span class="pre">-</span> <span class="pre">c2</span> <span class="pre">AS</span> <span class="pre">sum12;</span> <span class="pre">Scan</span> <span class="pre">c1</span> <span class="pre">as</span> <span class="pre">u32,</span> <span class="pre">c2</span> <span class="pre">as</span> <span class="pre">u64</span></code>)
 that knows how to derive its schema.</p>
 <p>Certain plans have a frozen schema (e.g. Scan), while others derive their
 schema from their child nodes.</p>
-</div>
-<div class="section" id="column">
+</section>
+<section id="column">
 <h4>Column<a class="headerlink" href="#column" title="Permalink to this headline">¶</a></h4>
 <p>An identifier in a logical plan consists of field name and relation name.</p>
-</div>
-</div>
-<div class="section" id="physical">
+</section>
+</section>
+<section id="physical">
 <h3>Physical<a class="headerlink" href="#physical" title="Permalink to this headline">¶</a></h3>
-<div class="section" id="id1">
+<section id="id1">
 <h4>Function<a class="headerlink" href="#id1" title="Permalink to this headline">¶</a></h4>
 <p>An object that knows how to derive its physical field from its arguments’
 physical fields, and also how to actually perform the computation on data. A
@@ -716,44 +744,44 @@ <h4>Function<a class="headerlink" href="#id1" title="Permalink to this headline"
 <li><p><code class="docutils literal notranslate"><span class="pre">plus(a,b)</span> <span class="pre">-&gt;</span> <span class="pre">PF(&quot;{a}</span> <span class="pre">Plus</span> <span class="pre">{b}&quot;,</span> <span class="pre">d(a.type,b.type),</span> <span class="pre">a.nullable</span> <span class="pre">|</span> <span class="pre">b.nullable)</span></code> where d is a complex function (<code class="docutils literal notranslate"><span class="pre">get_supertype</span></code> in our current implementation) whose computation is for each element in the columns, sum the two entries together and return it in the same type as the smallest type of both columns.</p></li>
 <li><p><code class="docutils literal notranslate"><span class="pre">length(&amp;str)</span> <span class="pre">-&gt;</span> <span class="pre">PF(&quot;length({a})&quot;,</span> <span class="pre">u32,</span> <span class="pre">a.nullable)</span></code> whose computation is “count number of bytes in the string”.</p></li>
 </ul>
-</div>
-<div class="section" id="id2">
+</section>
+<section id="id2">
 <h4>Plan<a class="headerlink" href="#id2" title="Permalink to this headline">¶</a></h4>
 <p>A tree (e.g. <code class="docutils literal notranslate"><span class="pre">Projection</span> <span class="pre">c1</span> <span class="pre">+</span> <span class="pre">c2,</span> <span class="pre">c1</span> <span class="pre">-</span> <span class="pre">c2</span> <span class="pre">AS</span> <span class="pre">sum12;</span> <span class="pre">Scan</span> <span class="pre">c1</span> <span class="pre">as</span> <span class="pre">u32,</span> <span class="pre">c2</span> <span class="pre">as</span> <span class="pre">u64</span></code>)
 that knows how to derive its metadata and compute itself.</p>
 <p>Note how the physical plane does not know how to derive field names: field
 names are solely a property of the logical plane, as they are not needed in the
 physical plane.</p>
-</div>
-<div class="section" id="id3">
+</section>
+<section id="id3">
 <h4>Column<a class="headerlink" href="#id3" title="Permalink to this headline">¶</a></h4>
 <p>A type of physical node in a physical plan consists of a field name and unique index.</p>
-</div>
-</div>
-<div class="section" id="data-sources-registry">
+</section>
+</section>
+<section id="data-sources-registry">
 <h3>Data Sources’ registry<a class="headerlink" href="#data-sources-registry" title="Permalink to this headline">¶</a></h3>
 <p>A map of source name/relation -&gt; Schema plus associated properties necessary to read data from it (e.g. file path).</p>
-</div>
-<div class="section" id="functions-registry">
+</section>
+<section id="functions-registry">
 <h3>Functions’ registry<a class="headerlink" href="#functions-registry" title="Permalink to this headline">¶</a></h3>
 <p>A map of function name -&gt; logical + physical function.</p>
-</div>
-<div class="section" id="physical-planner">
+</section>
+<section id="physical-planner">
 <h3>Physical Planner<a class="headerlink" href="#physical-planner" title="Permalink to this headline">¶</a></h3>
 <p>A function that knows how to derive a physical plan from a logical plan:</p>
 <div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="n">plan</span><span class="p">(</span><span class="n">LogicalPlan</span><span class="p">)</span> <span class="o">-&gt;</span> <span class="n">PhysicalPlan</span>
 </pre></div>
 </div>
-</div>
-<div class="section" id="logical-optimizer">
+</section>
+<section id="logical-optimizer">
 <h3>Logical Optimizer<a class="headerlink" href="#logical-optimizer" title="Permalink to this headline">¶</a></h3>
 <p>A function that accepts a logical plan and returns an (optimized) logical plan
 which computes the same results, but in a more efficient manner:</p>
 <div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="n">optimize</span><span class="p">(</span><span class="n">LogicalPlan</span><span class="p">)</span> <span class="o">-&gt;</span> <span class="n">LogicalPlan</span>
 </pre></div>
 </div>
-</div>
-<div class="section" id="physical-optimizer">
+</section>
+<section id="physical-optimizer">
 <h3>Physical Optimizer<a class="headerlink" href="#physical-optimizer" title="Permalink to this headline">¶</a></h3>
 <p>A function that accepts a physical plan and returns an (optimized) physical
 plan which computes the same results, but may differ based on the actual
@@ -761,17 +789,17 @@ <h3>Physical Optimizer<a class="headerlink" href="#physical-optimizer" title="Pe
 <div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="n">optimize</span><span class="p">(</span><span class="n">PhysicalPlan</span><span class="p">)</span> <span class="o">-&gt;</span> <span class="n">PhysicalPlan</span>
 </pre></div>
 </div>
-</div>
-<div class="section" id="builder">
+</section>
+<section id="builder">
 <h3>Builder<a class="headerlink" href="#builder" title="Permalink to this headline">¶</a></h3>
 <p>A function that knows how to build a new logical plan from an existing logical
 plan and some extra parameters.</p>
 <div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="n">build</span><span class="p">(</span><span class="n">logical_plan</span><span class="p">,</span> <span class="n">params</span><span class="o">...</span><span class="p">)</span> <span class="o">-&gt;</span> <span class="n">logical_plan</span>
 </pre></div>
 </div>
-</div>
-</div>
-<div class="section" id="invariants">
+</section>
+</section>
+<section id="invariants">
 <h2>Invariants<a class="headerlink" href="#invariants" title="Permalink to this headline">¶</a></h2>
 <p>The following subsections describe invariants. Since functions’ output schema
 depends on its arguments’ schema (e.g. min, plus), the resulting schema can
@@ -780,44 +808,44 @@ <h2>Invariants<a class="headerlink" href="#invariants" title="Permalink to this
 registered (e.g. does <code class="docutils literal notranslate"><span class="pre">my_op</span></code> return u32 or u64?). Thus, in this section, the
 wording “same schema” is understood to mean “same schema under a given registry
 of data sources and functions”.</p>
-<div class="section" id="relation-name-tuples-in-logical-fields-and-logical-columns-are-unique">
+<section id="relation-name-tuples-in-logical-fields-and-logical-columns-are-unique">
 <h3>(relation, name) tuples in logical fields and logical columns are unique<a class="headerlink" href="#relation-name-tuples-in-logical-fields-and-logical-columns-are-unique" title="Permalink to this headline">¶</a></h3>
 <p>Every logical field’s (relation, name) tuple in a logical schema MUST be unique.
 Every logical column’s (relation, name) tuple in a logical plan MUST be unique.</p>
 <p>This invariant guarantees that <code class="docutils literal notranslate"><span class="pre">SELECT</span> <span class="pre">t1.id,</span> <span class="pre">t2.id</span> <span class="pre">FROM</span> <span class="pre">t1</span> <span class="pre">JOIN</span> <span class="pre">t2...</span></code>
 unambiguously selects the field <code class="docutils literal notranslate"><span class="pre">t1.id</span></code> and <code class="docutils literal notranslate"><span class="pre">t2.id</span></code> in a logical schema in the
 logical plane.</p>
-<div class="section" id="responsibility">
+<section id="responsibility">
 <h4>Responsibility<a class="headerlink" href="#responsibility" title="Permalink to this headline">¶</a></h4>
 <p>It is the logical builder and optimizer’s responsibility to guarantee this
 invariant.</p>
-</div>
-<div class="section" id="validation">
+</section>
+<section id="validation">
 <h4>Validation<a class="headerlink" href="#validation" title="Permalink to this headline">¶</a></h4>
 <p>Builder and optimizer MUST error if this invariant is violated on any logical
 node that creates a new schema (e.g. scan, projection, aggregation, join, etc.).</p>
-</div>
-</div>
-<div class="section" id="physical-schema-is-consistent-with-data">
+</section>
+</section>
+<section id="physical-schema-is-consistent-with-data">
 <h3>Physical schema is consistent with data<a class="headerlink" href="#physical-schema-is-consistent-with-data" title="Permalink to this headline">¶</a></h3>
 <p>The contents of every Array in every RecordBatch in every partition returned by
 a physical plan MUST be consistent with RecordBatch’s schema, in that every
 Array in the RecordBatch must be downcastable to its corresponding type
 declared in the RecordBatch.</p>
-<div class="section" id="id4">
+<section id="id4">
 <h4>Responsibility<a class="headerlink" href="#id4" title="Permalink to this headline">¶</a></h4>
 <p>Physical functions MUST guarantee this invariant. This is particularly
 important in aggregate functions, whose aggregating type may be different from
 the intermediary types during calculations (e.g. sum(i32) -&gt; i64).</p>
-</div>
-<div class="section" id="id5">
+</section>
+<section id="id5">
 <h4>Validation<a class="headerlink" href="#id5" title="Permalink to this headline">¶</a></h4>
 <p>Since the validation of this invariant is computationally expensive, execution
 contexts CAN validate this invariant. It is acceptable for physical nodes to
 <code class="docutils literal notranslate"><span class="pre">panic!</span></code> if their input does not satisfy this invariant.</p>
-</div>
-</div>
-<div class="section" id="physical-schema-is-consistent-in-physical-functions">
+</section>
+</section>
+<section id="physical-schema-is-consistent-in-physical-functions">
 <h3>Physical schema is consistent in physical functions<a class="headerlink" href="#physical-schema-is-consistent-in-physical-functions" title="Permalink to this headline">¶</a></h3>
 <p>The schema of every Array returned by a physical function MUST match the
 DataType reported by the physical function itself.</p>
@@ -825,7 +853,7 @@ <h3>Physical schema is consistent in physical functions<a class="headerlink" hre
 (e.g. Int32), users can safely downcast its resulting Array to the
 corresponding type (e.g. Int32Array), as well as to write data to formats that
 have a schema with nullability flag (e.g. parquet).</p>
-<div class="section" id="id6">
+<section id="id6">
 <h4>Responsibility<a class="headerlink" href="#id6" title="Permalink to this headline">¶</a></h4>
 <p>It is the responsibility of the developer that writes a physical function to
 guarantee this invariant.</p>
@@ -834,14 +862,14 @@ <h4>Responsibility<a class="headerlink" href="#id6" title="Permalink to this hea
 <li><p>The derived DataType matches the code it uses to build the array for every branch of valid input type combinations.</p></li>
 <li><p>The nullability flag matches how the values are built.</p></li>
 </ul>
-</div>
-<div class="section" id="id7">
+</section>
+<section id="id7">
 <h4>Validation<a class="headerlink" href="#id7" title="Permalink to this headline">¶</a></h4>
 <p>Since the validation of this invariant is computationally expensive, execution
 contexts CAN validate this invariant.</p>
-</div>
-</div>
-<div class="section" id="the-physical-schema-is-invariant-under-planning">
+</section>
+</section>
+<section id="the-physical-schema-is-invariant-under-planning">
 <h3>The physical schema is invariant under planning<a class="headerlink" href="#the-physical-schema-is-invariant-under-planning" title="Permalink to this headline">¶</a></h3>
 <p>The physical schema derived by a physical plan returned by the planner MUST be
 equivalent to the physical schema derived by the logical plan passed to the
@@ -861,19 +889,19 @@ <h3>The physical schema is invariant under planning<a class="headerlink" href="#
 single function, <code class="docutils literal notranslate"><span class="pre">Projection</span> <span class="pre">f(c1,c2)</span></code>, a corollary of this is that the
 physical schema of every <code class="docutils literal notranslate"><span class="pre">logical</span> <span class="pre">function</span> <span class="pre">-&gt;</span> <span class="pre">physical</span> <span class="pre">function</span></code> must be
 invariant under planning.</p>
-<div class="section" id="id8">
+<section id="id8">
 <h4>Responsibility<a class="headerlink" href="#id8" title="Permalink to this headline">¶</a></h4>
 <p>Developers of physical and logical plans and planners MUST guarantee this
 invariant for every triplet (logical plan, physical plan, conversion rule).</p>
-</div>
-<div class="section" id="id9">
+</section>
+<section id="id9">
 <h4>Validation<a class="headerlink" href="#id9" title="Permalink to this headline">¶</a></h4>
 <p>Planners MUST validate this invariant. In particular they MUST return an error
 when, during planning, a physical function’s derived schema does not match the
 logical functions’ derived schema.</p>
-</div>
-</div>
-<div class="section" id="the-output-schema-equals-the-physical-plan-schema">
+</section>
+</section>
+<section id="the-output-schema-equals-the-physical-plan-schema">
 <h3>The output schema equals the physical plan schema<a class="headerlink" href="#the-output-schema-equals-the-physical-plan-schema" title="Permalink to this headline">¶</a></h3>
 <p>The schema of every RecordBatch in every partition outputted by a physical plan
 MUST be equal to the schema of the physical plan. Specifically:</p>
@@ -883,16 +911,16 @@ <h3>The output schema equals the physical plan schema<a class="headerlink" href=
 <p>Together with other invariants, this ensures that the consumers of record
 batches do not need to know the output schema of the physical plan; they can
 safely rely on the record batch’s schema to perform downscaling and naming.</p>
-<div class="section" id="id10">
+<section id="id10">
 <h4>Responsibility<a class="headerlink" href="#id10" title="Permalink to this headline">¶</a></h4>
 <p>Physical nodes MUST guarantee this invariant.</p>
-</div>
-<div class="section" id="id11">
+</section>
+<section id="id11">
 <h4>Validation<a class="headerlink" href="#id11" title="Permalink to this headline">¶</a></h4>
 <p>Execution Contexts CAN validate this invariant.</p>
-</div>
-</div>
-<div class="section" id="logical-schema-is-invariant-under-logical-optimization">
+</section>
+</section>
+<section id="logical-schema-is-invariant-under-logical-optimization">
 <h3>Logical schema is invariant under logical optimization<a class="headerlink" href="#logical-schema-is-invariant-under-logical-optimization" title="Permalink to this headline">¶</a></h3>
 <p>The logical schema derived by a projected logical plan returned by the logical
 optimizer MUST be equivalent to the logical schema derived by the logical plan
@@ -903,16 +931,16 @@ <h3>Logical schema is invariant under logical optimization<a class="headerlink"
 <p>This is used to ensure that plans can be optimized without jeopardizing future
 referencing logical columns (name and index) or assumptions about their
 schemas.</p>
-<div class="section" id="id12">
+<section id="id12">
 <h4>Responsibility<a class="headerlink" href="#id12" title="Permalink to this headline">¶</a></h4>
 <p>Logical optimizers MUST guarantee this invariant.</p>
-</div>
-<div class="section" id="id13">
+</section>
+<section id="id13">
 <h4>Validation<a class="headerlink" href="#id13" title="Permalink to this headline">¶</a></h4>
 <p>Users of logical optimizers SHOULD validate this invariant.</p>
-</div>
-</div>
-<div class="section" id="physical-schema-is-invariant-under-physical-optimization">
+</section>
+</section>
+<section id="physical-schema-is-invariant-under-physical-optimization">
 <h3>Physical schema is invariant under physical optimization<a class="headerlink" href="#physical-schema-is-invariant-under-physical-optimization" title="Permalink to this headline">¶</a></h3>
 <p>The physical schema derived by a projected physical plan returned by the
 physical optimizer MUST match the physical schema derived by the physical plan
@@ -923,28 +951,39 @@ <h3>Physical schema is invariant under physical optimization<a class="headerlink
 <p>This is used to ensure that plans can be optimized without jeopardizing future
 referencs of logical columns (name and index) or assumptions about their
 schemas.</p>
-<div class="section" id="id14">
+<section id="id14">
 <h4>Responsibility<a class="headerlink" href="#id14" title="Permalink to this headline">¶</a></h4>
 <p>Optimizers MUST guarantee this invariant.</p>
-</div>
-<div class="section" id="id15">
+</section>
+<section id="id15">
 <h4>Validation<a class="headerlink" href="#id15" title="Permalink to this headline">¶</a></h4>
 <p>Users of optimizers SHOULD validate this invariant.</p>
-</div>
-</div>
-</div>
-</div>
+</section>
+</section>
+</section>
+</section>
 
 
               </div>
               
               
-              <div class='prev-next-bottom'>
-                
-    <a class='left-prev' id="prev-link" href="../user-guide/faq.html" title="previous page">Frequently Asked Questions</a>
-    <a class='right-next' id="next-link" href="output-field-name-semantic.html" title="next page">Datafusion output field name semantic</a>
-
-              </div>
+              <!-- Previous / next buttons -->
+<div class='prev-next-area'>
+    <a class='left-prev' id="prev-link" href="roadmap.html" title="previous page">
+        <i class="fas fa-angle-left"></i>
+        <div class="prev-next-info">
+            <p class="prev-next-subtitle">previous</p>
+            <p class="prev-next-title">Roadmap</p>
+        </div>
+    </a>
+    <a class='right-next' id="next-link" href="output-field-name-semantic.html" title="next page">
+    <div class="prev-next-info">
+        <p class="prev-next-subtitle">next</p>
+        <p class="prev-next-title">Datafusion output field name semantic</p>
+    </div>
+    <i class="fas fa-angle-right"></i>
+    </a>
+</div>
               
           </main>
           
@@ -952,20 +991,19 @@ <h4>Validation<a class="headerlink" href="#id15" title="Permalink to this headli
       </div>
     </div>
   
-  <script src="../_static/js/index.1c5a1a01449ed65a7b51.js"></script>
-
+    <script src="../_static/scripts/pydata-sphinx-theme.js?digest=1999514e3f237ded88cf"></script>
   <footer class="footer mt-5 mt-md-0">
   <div class="container">
     
     <div class="footer-item">
       <p class="copyright">
-    &copy; Copyright 2021, Apache Software Foundation.<br/>
+    &copy; Copyright 2021, Apache Software Foundation.<br>
 </p>
     </div>
     
     <div class="footer-item">
       <p class="sphinx-version">
-Created using <a href="http://sphinx-doc.org/">Sphinx</a> 2.4.4.<br/>
+Created using <a href="http://sphinx-doc.org/">Sphinx</a> 2.4.4.<br>
 </p>
     </div>
     
diff --git a/datafusion/specification/output-field-name-semantic.html b/datafusion/specification/output-field-name-semantic.html
index 0f510f3d8e3a..26d652fe01f8 100644
--- a/datafusion/specification/output-field-name-semantic.html
+++ b/datafusion/specification/output-field-name-semantic.html
@@ -3,30 +3,31 @@
 
 <html xmlns="http://www.w3.org/1999/xhtml">
   <head>
-    <meta charset="utf-8" />
+    <meta charset="utf-8" /><meta name="generator" content="Docutils 0.17.1: http://docutils.sourceforge.net/" />
+
     <title>Datafusion output field name semantic &#8212; Arrow Datafusion  documentation</title>
     
-  <link href="../_static/css/theme.css" rel="stylesheet" />
-  <link href="../_static/css/index.c5995385ac14fb8791e8eb36b4908be2.css" rel="stylesheet" />
-
+    <link href="../_static/styles/theme.css?digest=1999514e3f237ded88cf" rel="stylesheet">
+<link href="../_static/styles/pydata-sphinx-theme.css?digest=1999514e3f237ded88cf" rel="stylesheet">
+  
     
-  <link rel="stylesheet"
-    href="../_static/vendor/fontawesome/5.13.0/css/all.min.css">
-  <link rel="preload" as="font" type="font/woff2" crossorigin
-    href="../_static/vendor/fontawesome/5.13.0/webfonts/fa-solid-900.woff2">
-  <link rel="preload" as="font" type="font/woff2" crossorigin
-    href="../_static/vendor/fontawesome/5.13.0/webfonts/fa-brands-400.woff2">
-
+    <link rel="stylesheet"
+      href="../_static/vendor/fontawesome/5.13.0/css/all.min.css">
+    <link rel="preload" as="font" type="font/woff2" crossorigin
+      href="../_static/vendor/fontawesome/5.13.0/webfonts/fa-solid-900.woff2">
+    <link rel="preload" as="font" type="font/woff2" crossorigin
+      href="../_static/vendor/fontawesome/5.13.0/webfonts/fa-brands-400.woff2">
+  
     
       
-
+  
     
-    <link rel="stylesheet" href="../_static/basic.css" type="text/css" />
+    <link rel="stylesheet" href="../_static/styles/pydata-sphinx-theme.css" type="text/css" />
     <link rel="stylesheet" href="../_static/pygments.css" type="text/css" />
     <link rel="stylesheet" type="text/css" href="../_static/theme_overrides.css" />
     
-  <link rel="preload" as="script" href="../_static/js/index.1c5a1a01449ed65a7b51.js">
-
+    <link rel="preload" as="script" href="../_static/scripts/pydata-sphinx-theme.js?digest=1999514e3f237ded88cf">
+  
     <script id="documentation_options" data-url_root="../" src="../_static/documentation_options.js"></script>
     <script src="../_static/jquery.js"></script>
     <script src="../_static/underscore.js"></script>
@@ -34,10 +35,13 @@
     <script src="../_static/language_data.js"></script>
     <link rel="index" title="Index" href="../genindex.html" />
     <link rel="search" title="Search" href="../search.html" />
-    <link rel="next" title="Communication" href="../community/communication.html" />
+    <link rel="next" title="Roadmap" href="quarterly_roadmap.html" />
     <link rel="prev" title="DataFusion’s Invariants" href="invariants.html" />
     <meta name="viewport" content="width=device-width, initial-scale=1" />
-    <meta name="docsearch:language" content="en" />
+    <meta name="docsearch:language" content="None">
+    
+
+    <!-- Google Analytics -->
     
   </head>
   <body data-spy="scroll" data-target="#bd-toc-nav" data-offset="80">
@@ -53,6 +57,7 @@
             
             <!-- Only show if we have sidebars configured, else just a small margin  -->
             <div class="col-12 col-md-3 bd-sidebar">
+              <div class="sidebar-start-items">
 <a class="navbar-brand" href="../index.html">
   <img src="../_static/images/DataFusion-Logo-Background-White.png" class="logo" alt="logo">
 </a>
@@ -65,7 +70,7 @@
 <nav class="bd-links" id="bd-docs-nav" aria-label="Main navigation">
   <div class="bd-toc-item active">
     
-    <p class="caption">
+    <p>
  <span class="caption-text">
   Supported Environments
  </span>
@@ -174,7 +179,7 @@
   </a>
  </li>
 </ul>
-<p class="caption">
+<p>
  <span class="caption-text">
   User Guide
  </span>
@@ -210,6 +215,11 @@
    </i>
   </label>
   <ul>
+   <li class="toctree-l2">
+    <a class="reference internal" href="../user-guide/sql/sql_status.html">
+     Status
+    </a>
+   </li>
    <li class="toctree-l2">
     <a class="reference internal" href="../user-guide/sql/select.html">
      SELECT syntax
@@ -314,12 +324,17 @@
   </a>
  </li>
 </ul>
-<p class="caption">
+<p>
  <span class="caption-text">
   Specification
  </span>
 </p>
 <ul class="current nav bd-sidenav">
+ <li class="toctree-l1">
+  <a class="reference internal" href="roadmap.html">
+   Roadmap
+  </a>
+ </li>
  <li class="toctree-l1">
   <a class="reference internal" href="invariants.html">
    DataFusion’s Invariants
@@ -330,8 +345,13 @@
    Datafusion output field name semantic
   </a>
  </li>
+ <li class="toctree-l1">
+  <a class="reference internal" href="quarterly_roadmap.html">
+   Roadmap
+  </a>
+ </li>
 </ul>
-<p class="caption">
+<p>
  <span class="caption-text">
   README
  </span>
@@ -348,7 +368,7 @@
   </a>
  </li>
 </ul>
-<p class="caption">
+<p>
  <span class="caption-text">
   Community
  </span>
@@ -364,11 +384,19 @@
    Issue tracker
   </a>
  </li>
+ <li class="toctree-l1">
+  <a class="reference external" href="https://github.com/apache/arrow-datafusion/blob/master/CODE_OF_CONDUCT.md">
+   Code of conduct
+  </a>
+ </li>
 </ul>
 
     
   </div>
 </nav>
+              </div>
+              <div class="sidebar-end-items">
+              </div>
             </div>
             
           
@@ -470,12 +498,12 @@
   specific language governing permissions and limitations
   under the License.
 -->
-<div class="section" id="datafusion-output-field-name-semantic">
+<section id="datafusion-output-field-name-semantic">
 <h1>Datafusion output field name semantic<a class="headerlink" href="#datafusion-output-field-name-semantic" title="Permalink to this headline">¶</a></h1>
 <p>This specification documents how field names in output record batches should be
 generated based on given user queries. The filed name rules apply to
 Datafusion queries planned from both SQL queries and Dataframe APIs.</p>
-<div class="section" id="field-name-rules">
+<section id="field-name-rules">
 <h2>Field name rules<a class="headerlink" href="#field-name-rules" title="Permalink to this headline">¶</a></h2>
 <ul class="simple">
 <li><p>All bare column field names MUST not contain relation/table qualifier.</p>
@@ -514,10 +542,10 @@ <h2>Field name rules<a class="headerlink" href="#field-name-rules" title="Permal
 </ul>
 </li>
 </ul>
-</div>
-<div class="section" id="appendices">
+</section>
+<section id="appendices">
 <h2>Appendices<a class="headerlink" href="#appendices" title="Permalink to this headline">¶</a></h2>
-<div class="section" id="examples-and-comparison-with-other-systems">
+<section id="examples-and-comparison-with-other-systems">
 <h3>Examples and comparison with other systems<a class="headerlink" href="#examples-and-comparison-with-other-systems" title="Permalink to this headline">¶</a></h3>
 <p>Data schema for test sample queries:</p>
 <div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="n">CREATE</span> <span class="n">TABLE</span> <span class="n">t1</span> <span class="p">(</span><span class="nb">id</span> <span class="n">INT</span><span class="p">,</span> <span class="n">a</span> <span class="n">VARCHAR</span><span class="p">(</span><span class="mi">5</span><span class="p">));</span>
@@ -529,7 +557,7 @@ <h3>Examples and comparison with other systems<a class="headerlink" href="#examp
 <span class="n">INSERT</span> <span class="n">INTO</span> <span class="n">t2</span> <span class="p">(</span><span class="nb">id</span><span class="p">,</span> <span class="n">b</span><span class="p">)</span> <span class="n">VALUES</span> <span class="p">(</span><span class="mi">2</span><span class="p">,</span> <span class="s1">&#39;world&#39;</span><span class="p">);</span>
 </pre></div>
 </div>
-<div class="section" id="projected-columns">
+<section id="projected-columns">
 <h4>Projected columns<a class="headerlink" href="#projected-columns" title="Permalink to this headline">¶</a></h4>
 <p>Query:</p>
 <div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="n">SELECT</span> <span class="n">t1</span><span class="o">.</span><span class="n">id</span><span class="p">,</span> <span class="n">a</span><span class="p">,</span> <span class="n">t2</span><span class="o">.</span><span class="n">id</span><span class="p">,</span> <span class="n">b</span>
@@ -600,8 +628,8 @@ <h4>Projected columns<a class="headerlink" href="#projected-columns" title="Perm
 </tr>
 </tbody>
 </table>
-</div>
-<div class="section" id="function-transformed-columns">
+</section>
+<section id="function-transformed-columns">
 <h4>Function transformed columns<a class="headerlink" href="#function-transformed-columns" title="Permalink to this headline">¶</a></h4>
 <p>Query:</p>
 <div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="n">SELECT</span> <span class="n">ABS</span><span class="p">(</span><span class="n">t1</span><span class="o">.</span><span class="n">id</span><span class="p">),</span> <span class="nb">abs</span><span class="p">(</span><span class="o">-</span><span class="nb">id</span><span class="p">)</span> <span class="n">FROM</span> <span class="n">t1</span><span class="p">;</span>
@@ -687,8 +715,8 @@ <h4>Function transformed columns<a class="headerlink" href="#function-transforme
 </tr>
 </tbody>
 </table>
-</div>
-<div class="section" id="function-with-operators">
+</section>
+<section id="function-with-operators">
 <h4>Function with operators<a class="headerlink" href="#function-with-operators" title="Permalink to this headline">¶</a></h4>
 <p>Query:</p>
 <div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="n">SELECT</span> <span class="n">t1</span><span class="o">.</span><span class="n">id</span> <span class="o">+</span> <span class="n">ABS</span><span class="p">(</span><span class="nb">id</span><span class="p">),</span> <span class="n">ABS</span><span class="p">(</span><span class="nb">id</span> <span class="o">*</span> <span class="n">t1</span><span class="o">.</span><span class="n">id</span><span class="p">)</span> <span class="n">FROM</span> <span class="n">t1</span><span class="p">;</span>
@@ -774,8 +802,8 @@ <h4>Function with operators<a class="headerlink" href="#function-with-operators"
 </tr>
 </tbody>
 </table>
-</div>
-<div class="section" id="project-literals">
+</section>
+<section id="project-literals">
 <h4>Project literals<a class="headerlink" href="#project-literals" title="Permalink to this headline">¶</a></h4>
 <p>Query:</p>
 <div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="n">SELECT</span> <span class="mi">1</span><span class="p">,</span> <span class="mi">2</span><span class="o">+</span><span class="mi">5</span><span class="p">,</span> <span class="s1">&#39;foo_bar&#39;</span><span class="p">;</span>
@@ -856,21 +884,32 @@ <h4>Project literals<a class="headerlink" href="#project-literals" title="Permal
 </tr>
 </tbody>
 </table>
-</div>
-</div>
-</div>
-</div>
+</section>
+</section>
+</section>
+</section>
 
 
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-    <a class='right-next' id="next-link" href="../community/communication.html" title="next page">Communication</a>
-
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+              <!-- Previous / next buttons -->
+<div class='prev-next-area'>
+    <a class='left-prev' id="prev-link" href="invariants.html" title="previous page">
+        <i class="fas fa-angle-left"></i>
+        <div class="prev-next-info">
+            <p class="prev-next-subtitle">previous</p>
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+        </div>
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+        <p class="prev-next-subtitle">next</p>
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@@ -878,20 +917,19 @@ <h4>Project literals<a class="headerlink" href="#project-literals" title="Permal
       </div>
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-Created using <a href="http://sphinx-doc.org/">Sphinx</a> 2.4.4.<br/>
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diff --git a/datafusion/specification/quarterly_roadmap.html b/datafusion/specification/quarterly_roadmap.html
new file mode 100644
index 000000000000..32d80c7671a9
--- /dev/null
+++ b/datafusion/specification/quarterly_roadmap.html
@@ -0,0 +1,635 @@
+
+<!DOCTYPE html>
+
+<html xmlns="http://www.w3.org/1999/xhtml">
+  <head>
+    <meta charset="utf-8" /><meta name="generator" content="Docutils 0.17.1: http://docutils.sourceforge.net/" />
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+ <span class="caption-text">
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+   Example Usage
+  </a>
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+ <li class="toctree-l1">
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+   Using DataFusion as a library
+  </a>
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+  <a class="reference internal" href="../user-guide/cli.html">
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+     Status
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+   </li>
+   <li class="toctree-l2">
+    <a class="reference internal" href="../user-guide/sql/select.html">
+     SELECT syntax
+    </a>
+   </li>
+   <li class="toctree-l2">
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+     DDL
+    </a>
+   </li>
+   <li class="toctree-l2">
+    <a class="reference internal" href="../user-guide/sql/datafusion-functions.html">
+     DataFusion Functions
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+   </li>
+  </ul>
+ </li>
+ <li class="toctree-l1 has-children">
+  <a class="reference internal" href="../user-guide/distributed/index.html">
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+     Overview
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+   <li class="toctree-l2 has-children">
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+     Start a Ballista Cluster
+    </a>
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+     <li class="toctree-l3">
+      <a class="reference internal" href="../user-guide/distributed/deployment/cargo-install.html">
+       Deploying a standalone Ballista cluster using cargo install
+      </a>
+     </li>
+     <li class="toctree-l3">
+      <a class="reference internal" href="../user-guide/distributed/deployment/docker.html">
+       Starting a Ballista cluster using Docker
+      </a>
+     </li>
+     <li class="toctree-l3">
+      <a class="reference internal" href="../user-guide/distributed/deployment/docker-compose.html">
+       Starting a Ballista cluster using Docker Compose
+      </a>
+     </li>
+     <li class="toctree-l3">
+      <a class="reference internal" href="../user-guide/distributed/deployment/kubernetes.html">
+       Deploying Ballista with Kubernetes
+      </a>
+     </li>
+     <li class="toctree-l3">
+      <a class="reference internal" href="../user-guide/distributed/deployment/raspberrypi.html">
+       Running Ballista on Raspberry Pi
+      </a>
+     </li>
+     <li class="toctree-l3">
+      <a class="reference internal" href="../user-guide/distributed/deployment/configuration.html">
+       Configuration
+      </a>
+     </li>
+    </ul>
+   </li>
+   <li class="toctree-l2 has-children">
+    <a class="reference internal" href="../user-guide/distributed/clients/index.html">
+     Clients
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+     <li class="toctree-l3">
+      <a class="reference internal" href="../user-guide/distributed/clients/rust.html">
+       Ballista Rust Client
+      </a>
+     </li>
+     <li class="toctree-l3">
+      <a class="reference internal" href="../user-guide/distributed/clients/python.html">
+       Python
+      </a>
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+ <li class="toctree-l1">
+  <a class="reference internal" href="../user-guide/faq.html">
+   Frequently Asked Questions
+  </a>
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+</ul>
+<p>
+ <span class="caption-text">
+  Specification
+ </span>
+</p>
+<ul class="current nav bd-sidenav">
+ <li class="toctree-l1">
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+   Roadmap
+  </a>
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+   DataFusion’s Invariants
+  </a>
+ </li>
+ <li class="toctree-l1">
+  <a class="reference internal" href="output-field-name-semantic.html">
+   Datafusion output field name semantic
+  </a>
+ </li>
+ <li class="toctree-l1 current active">
+  <a class="current reference internal" href="#">
+   Roadmap
+  </a>
+ </li>
+</ul>
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+ <span class="caption-text">
+  README
+ </span>
+</p>
+<ul class="nav bd-sidenav">
+ <li class="toctree-l1">
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+   Datafusion
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+ </li>
+ <li class="toctree-l1">
+  <a class="reference external" href="https://github.com/apache/arrow-datafusion/tree/master/ballista/README.md">
+   Ballista
+  </a>
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+ <span class="caption-text">
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+    <ul class="visible nav section-nav flex-column">
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+  <a class="reference internal nav-link" href="#q1">
+   2022 Q1
+  </a>
+  <ul class="nav section-nav flex-column">
+   <li class="toc-h3 nav-item toc-entry">
+    <a class="reference internal nav-link" href="#datafusion-core">
+     DataFusion Core
+    </a>
+   </li>
+   <li class="toc-h3 nav-item toc-entry">
+    <a class="reference internal nav-link" href="#benchmarking">
+     Benchmarking
+    </a>
+   </li>
+   <li class="toc-h3 nav-item toc-entry">
+    <a class="reference internal nav-link" href="#performance-improvements">
+     Performance Improvements
+    </a>
+   </li>
+   <li class="toc-h3 nav-item toc-entry">
+    <a class="reference internal nav-link" href="#new-features">
+     New Features
+    </a>
+   </li>
+   <li class="toc-h3 nav-item toc-entry">
+    <a class="reference internal nav-link" href="#ballista">
+     Ballista
+    </a>
+   </li>
+   <li class="toc-h3 nav-item toc-entry">
+    <a class="reference internal nav-link" href="#extensions-datafusion-contrib">
+     Extensions (datafusion-contrib)
+    </a>
+   </li>
+  </ul>
+ </li>
+ <li class="toc-h2 nav-item toc-entry">
+  <a class="reference internal nav-link" href="#beyond-2022-q1">
+   Beyond 2022 Q1
+  </a>
+  <ul class="nav section-nav flex-column">
+   <li class="toc-h3 nav-item toc-entry">
+    <a class="reference internal nav-link" href="#id1">
+     DataFusion Core
+    </a>
+   </li>
+   <li class="toc-h3 nav-item toc-entry">
+    <a class="reference internal nav-link" href="#id2">
+     Ballista
+    </a>
+   </li>
+  </ul>
+ </li>
+</ul>
+
+</nav>
+              </div>
+              
+              <div class="toc-item">
+                
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+<div class="tocsection editthispage">
+    <a href="https://github.com/apache/arrow-datafusion/edit/master/docs/source/specification/quarterly_roadmap.md">
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+    </a>
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+  <!---
+  Licensed to the Apache Software Foundation (ASF) under one
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+  regarding copyright ownership.  The ASF licenses this file
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+  under the License.
+-->
+<section id="roadmap">
+<h1>Roadmap<a class="headerlink" href="#roadmap" title="Permalink to this headline">¶</a></h1>
+<p>A quarterly roadmap will be published to give the DataFusion community visibility into the priorities of the projects contributors. This roadmap is not binding.</p>
+<section id="q1">
+<h2>2022 Q1<a class="headerlink" href="#q1" title="Permalink to this headline">¶</a></h2>
+<section id="datafusion-core">
+<h3>DataFusion Core<a class="headerlink" href="#datafusion-core" title="Permalink to this headline">¶</a></h3>
+<ul class="simple">
+<li><p>Publish official Arrow2 branch</p></li>
+<li><p>Implementation of memory manager (i.e. to enable spilling to disk as needed)</p></li>
+</ul>
+</section>
+<section id="benchmarking">
+<h3>Benchmarking<a class="headerlink" href="#benchmarking" title="Permalink to this headline">¶</a></h3>
+<ul class="simple">
+<li><p>Inclusion in Db-Benchmark with all quries covered</p></li>
+<li><p>All TPCH queries covered</p></li>
+</ul>
+</section>
+<section id="performance-improvements">
+<h3>Performance Improvements<a class="headerlink" href="#performance-improvements" title="Permalink to this headline">¶</a></h3>
+<ul class="simple">
+<li><p>Predicate evaluation</p></li>
+<li><p>Improve multi-column comparisons (that can’t be vectorized at the moment)</p></li>
+<li><p>Null constant support</p></li>
+</ul>
+</section>
+<section id="new-features">
+<h3>New Features<a class="headerlink" href="#new-features" title="Permalink to this headline">¶</a></h3>
+<ul class="simple">
+<li><p>Read JSON as table</p></li>
+<li><p>Simplify DDL with Datafusion-Cli</p></li>
+<li><p>Add Decimal128 data type and the attendant features such as Arrow Kernel and UDF support</p></li>
+<li><p>Add new experimental e-graph based optimizer</p></li>
+</ul>
+</section>
+<section id="ballista">
+<h3>Ballista<a class="headerlink" href="#ballista" title="Permalink to this headline">¶</a></h3>
+<ul class="simple">
+<li><p>Begin work on design documents and plan / priorities for development</p></li>
+</ul>
+</section>
+<section id="extensions-datafusion-contrib">
+<h3>Extensions (<a class="reference external" href="https://github.com/datafusion-contrib%5D">datafusion-contrib</a>)<a class="headerlink" href="#extensions-datafusion-contrib" title="Permalink to this headline">¶</a></h3>
+<ul class="simple">
+<li><p>Stable S3 support</p></li>
+<li><p>Begin design discussions and prototyping of a stream provider</p></li>
+</ul>
+</section>
+</section>
+<section id="beyond-2022-q1">
+<h2>Beyond 2022 Q1<a class="headerlink" href="#beyond-2022-q1" title="Permalink to this headline">¶</a></h2>
+<p>There is no clear timeline for the below, but community members have expressed interest in working on these topics.</p>
+<section id="id1">
+<h3>DataFusion Core<a class="headerlink" href="#id1" title="Permalink to this headline">¶</a></h3>
+<ul class="simple">
+<li><p>Custom SQL support</p></li>
+<li><p>Split DataFusion into multiple crates</p></li>
+<li><p>Push based query execution and code generation</p></li>
+</ul>
+</section>
+<section id="id2">
+<h3>Ballista<a class="headerlink" href="#id2" title="Permalink to this headline">¶</a></h3>
+<ul class="simple">
+<li><p>Evolve architecture so that it can be deployed in a multi-tenant cloud native environment</p></li>
+<li><p>Ensure Ballista is scalable, elastic, and stable for production usage</p></li>
+<li><p>Develop distributed ML capabilities</p></li>
+</ul>
+</section>
+</section>
+</section>
+
+
+              </div>
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+    <a class='right-next' id="next-link" href="../community/communication.html" title="next page">
+    <div class="prev-next-info">
+        <p class="prev-next-subtitle">next</p>
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+  <footer class="footer mt-5 mt-md-0">
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+Created using <a href="http://sphinx-doc.org/">Sphinx</a> 2.4.4.<br>
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+</html>
\ No newline at end of file
diff --git a/datafusion/specification/rfcs/template.html b/datafusion/specification/rfcs/template.html
new file mode 100644
index 000000000000..e14a089fd2c8
--- /dev/null
+++ b/datafusion/specification/rfcs/template.html
@@ -0,0 +1,563 @@
+
+<!DOCTYPE html>
+
+<html xmlns="http://www.w3.org/1999/xhtml">
+  <head>
+    <meta charset="utf-8" /><meta name="generator" content="Docutils 0.17.1: http://docutils.sourceforge.net/" />
+
+    <title>Background &#8212; Arrow Datafusion  documentation</title>
+    
+    <link href="../../_static/styles/theme.css?digest=1999514e3f237ded88cf" rel="stylesheet">
+<link href="../../_static/styles/pydata-sphinx-theme.css?digest=1999514e3f237ded88cf" rel="stylesheet">
+  
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+    <link rel="stylesheet"
+      href="../../_static/vendor/fontawesome/5.13.0/css/all.min.css">
+    <link rel="preload" as="font" type="font/woff2" crossorigin
+      href="../../_static/vendor/fontawesome/5.13.0/webfonts/fa-solid-900.woff2">
+    <link rel="preload" as="font" type="font/woff2" crossorigin
+      href="../../_static/vendor/fontawesome/5.13.0/webfonts/fa-brands-400.woff2">
+  
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+    <link rel="stylesheet" href="../../_static/styles/pydata-sphinx-theme.css" type="text/css" />
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+    
+    <link rel="preload" as="script" href="../../_static/scripts/pydata-sphinx-theme.js?digest=1999514e3f237ded88cf">
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+    <div class="container-xl">
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+            
+            <!-- Only show if we have sidebars configured, else just a small margin  -->
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+ </span>
+</p>
+<ul class="nav bd-sidenav">
+ <li class="toctree-l1">
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+     <li class="toctree-l3 has-children">
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+      </label>
+      <ul>
+       <li class="toctree-l4">
+        <a class="reference internal" href="../../python/generated/datafusion.DataFrame.html">
+         datafusion.DataFrame
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+     <li class="toctree-l3 has-children">
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+       <li class="toctree-l4">
+        <a class="reference internal" href="../../python/generated/datafusion.ExecutionContext.html">
+         datafusion.ExecutionContext
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+     <li class="toctree-l3 has-children">
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+      <ul>
+       <li class="toctree-l4">
+        <a class="reference internal" href="../../python/generated/datafusion.Expression.html">
+         datafusion.Expression
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+     </li>
+     <li class="toctree-l3 has-children">
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+      <ul>
+       <li class="toctree-l4">
+        <a class="reference internal" href="../../python/generated/datafusion.functions.html">
+         datafusion.functions
+        </a>
+       </li>
+      </ul>
+     </li>
+    </ul>
+   </li>
+  </ul>
+ </li>
+ <li class="toctree-l1">
+  <a class="reference internal" href="../../cli/index.html">
+   Command line
+  </a>
+ </li>
+</ul>
+<p>
+ <span class="caption-text">
+  User Guide
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+<ul class="nav bd-sidenav">
+ <li class="toctree-l1">
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+   Example Usage
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+ </li>
+ <li class="toctree-l1">
+  <a class="reference internal" href="../../user-guide/library.html">
+   Using DataFusion as a library
+  </a>
+ </li>
+ <li class="toctree-l1">
+  <a class="reference internal" href="../../user-guide/cli.html">
+   DataFusion Command-line Interface
+  </a>
+ </li>
+ <li class="toctree-l1 has-children">
+  <a class="reference internal" href="../../user-guide/sql/index.html">
+   SQL Reference
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+  <ul>
+   <li class="toctree-l2">
+    <a class="reference internal" href="../../user-guide/sql/sql_status.html">
+     Status
+    </a>
+   </li>
+   <li class="toctree-l2">
+    <a class="reference internal" href="../../user-guide/sql/select.html">
+     SELECT syntax
+    </a>
+   </li>
+   <li class="toctree-l2">
+    <a class="reference internal" href="../../user-guide/sql/ddl.html">
+     DDL
+    </a>
+   </li>
+   <li class="toctree-l2">
+    <a class="reference internal" href="../../user-guide/sql/datafusion-functions.html">
+     DataFusion Functions
+    </a>
+   </li>
+  </ul>
+ </li>
+ <li class="toctree-l1 has-children">
+  <a class="reference internal" href="../../user-guide/distributed/index.html">
+   Ballista Distributed Compute
+  </a>
+  <input class="toctree-checkbox" id="toctree-checkbox-8" name="toctree-checkbox-8" type="checkbox"/>
+  <label for="toctree-checkbox-8">
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+    <a class="reference internal" href="../../user-guide/distributed/introduction.html">
+     Overview
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+   <li class="toctree-l2 has-children">
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+     Start a Ballista Cluster
+    </a>
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+    <ul>
+     <li class="toctree-l3">
+      <a class="reference internal" href="../../user-guide/distributed/deployment/cargo-install.html">
+       Deploying a standalone Ballista cluster using cargo install
+      </a>
+     </li>
+     <li class="toctree-l3">
+      <a class="reference internal" href="../../user-guide/distributed/deployment/docker.html">
+       Starting a Ballista cluster using Docker
+      </a>
+     </li>
+     <li class="toctree-l3">
+      <a class="reference internal" href="../../user-guide/distributed/deployment/docker-compose.html">
+       Starting a Ballista cluster using Docker Compose
+      </a>
+     </li>
+     <li class="toctree-l3">
+      <a class="reference internal" href="../../user-guide/distributed/deployment/kubernetes.html">
+       Deploying Ballista with Kubernetes
+      </a>
+     </li>
+     <li class="toctree-l3">
+      <a class="reference internal" href="../../user-guide/distributed/deployment/raspberrypi.html">
+       Running Ballista on Raspberry Pi
+      </a>
+     </li>
+     <li class="toctree-l3">
+      <a class="reference internal" href="../../user-guide/distributed/deployment/configuration.html">
+       Configuration
+      </a>
+     </li>
+    </ul>
+   </li>
+   <li class="toctree-l2 has-children">
+    <a class="reference internal" href="../../user-guide/distributed/clients/index.html">
+     Clients
+    </a>
+    <input class="toctree-checkbox" id="toctree-checkbox-10" name="toctree-checkbox-10" type="checkbox"/>
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+     <i class="fas fa-chevron-down">
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+    <ul>
+     <li class="toctree-l3">
+      <a class="reference internal" href="../../user-guide/distributed/clients/rust.html">
+       Ballista Rust Client
+      </a>
+     </li>
+     <li class="toctree-l3">
+      <a class="reference internal" href="../../user-guide/distributed/clients/python.html">
+       Python
+      </a>
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+   </li>
+  </ul>
+ </li>
+ <li class="toctree-l1">
+  <a class="reference internal" href="../../user-guide/faq.html">
+   Frequently Asked Questions
+  </a>
+ </li>
+</ul>
+<p>
+ <span class="caption-text">
+  Specification
+ </span>
+</p>
+<ul class="nav bd-sidenav">
+ <li class="toctree-l1">
+  <a class="reference internal" href="../roadmap.html">
+   Roadmap
+  </a>
+ </li>
+ <li class="toctree-l1">
+  <a class="reference internal" href="../invariants.html">
+   DataFusion’s Invariants
+  </a>
+ </li>
+ <li class="toctree-l1">
+  <a class="reference internal" href="../output-field-name-semantic.html">
+   Datafusion output field name semantic
+  </a>
+ </li>
+ <li class="toctree-l1">
+  <a class="reference internal" href="../quarterly_roadmap.html">
+   Roadmap
+  </a>
+ </li>
+</ul>
+<p>
+ <span class="caption-text">
+  README
+ </span>
+</p>
+<ul class="nav bd-sidenav">
+ <li class="toctree-l1">
+  <a class="reference external" href="https://github.com/apache/arrow-datafusion/blob/master/README.md">
+   Datafusion
+  </a>
+ </li>
+ <li class="toctree-l1">
+  <a class="reference external" href="https://github.com/apache/arrow-datafusion/tree/master/ballista/README.md">
+   Ballista
+  </a>
+ </li>
+</ul>
+<p>
+ <span class="caption-text">
+  Community
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+</p>
+<ul class="nav bd-sidenav">
+ <li class="toctree-l1">
+  <a class="reference internal" href="../../community/communication.html">
+   Communication
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+ </li>
+ <li class="toctree-l1">
+  <a class="reference external" href="https://github.com/apache/arrow-datafusion/issues">
+   Issue tracker
+  </a>
+ </li>
+ <li class="toctree-l1">
+  <a class="reference external" href="https://github.com/apache/arrow-datafusion/blob/master/CODE_OF_CONDUCT.md">
+   Code of conduct
+  </a>
+ </li>
+</ul>
+
+    
+  </div>
+</nav>
+              </div>
+              <div class="sidebar-end-items">
+              </div>
+            </div>
+            
+          
+
+          
+          <div class="d-none d-xl-block col-xl-2 bd-toc">
+            
+              
+              <div class="toc-item">
+                
+<div class="tocsection onthispage pt-5 pb-3">
+    <i class="fas fa-list"></i> On this page
+</div>
+
+<nav id="bd-toc-nav">
+    <ul class="visible nav section-nav flex-column">
+ <li class="toc-h1 nav-item toc-entry">
+  <a class="reference internal nav-link" href="#">
+   Background
+  </a>
+ </li>
+ <li class="toc-h1 nav-item toc-entry">
+  <a class="reference internal nav-link" href="#goals">
+   Goals
+  </a>
+ </li>
+ <li class="toc-h1 nav-item toc-entry">
+  <a class="reference internal nav-link" href="#non-goals">
+   Non-Goals
+  </a>
+ </li>
+ <li class="toc-h1 nav-item toc-entry">
+  <a class="reference internal nav-link" href="#survey">
+   Survey
+  </a>
+ </li>
+ <li class="toc-h1 nav-item toc-entry">
+  <a class="reference internal nav-link" href="#general-design">
+   General design
+  </a>
+ </li>
+ <li class="toc-h1 nav-item toc-entry">
+  <a class="reference internal nav-link" href="#detailed-design">
+   Detailed design
+  </a>
+ </li>
+ <li class="toc-h1 nav-item toc-entry">
+  <a class="reference internal nav-link" href="#others">
+   Others
+  </a>
+ </li>
+</ul>
+
+</nav>
+              </div>
+              
+              <div class="toc-item">
+                
+
+<div class="tocsection editthispage">
+    <a href="https://github.com/apache/arrow-datafusion/edit/master/docs/source/specification/rfcs/template.md">
+        <i class="fas fa-pencil-alt"></i> Edit this page
+    </a>
+</div>
+
+              </div>
+              
+            
+          </div>
+          
+
+          
+          
+            
+          
+          <main class="col-12 col-md-9 col-xl-7 py-md-5 pl-md-5 pr-md-4 bd-content" role="main">
+              
+              <div>
+                
+  <!---
+  Licensed to the Apache Software Foundation (ASF) under one
+  or more contributor license agreements.  See the NOTICE file
+  distributed with this work for additional information
+  regarding copyright ownership.  The ASF licenses this file
+  to you under the Apache License, Version 2.0 (the
+  "License"); you may not use this file except in compliance
+  with the License.  You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+  Unless required by applicable law or agreed to in writing,
+  software distributed under the License is distributed on an
+  "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  KIND, either express or implied.  See the License for the
+  specific language governing permissions and limitations
+  under the License.
+-->
+<p>Feature Name:</p>
+<p>Status: draft/in-progress/completed/</p>
+<p>Start Date: YYYY-MM-DD</p>
+<p>Authors:</p>
+<p>RFC PR: #</p>
+<p>Datafusion Issue: #</p>
+<hr class="docutils" />
+<section id="background">
+<h1>Background<a class="headerlink" href="#background" title="Permalink to this headline">¶</a></h1>
+</section>
+<hr class="docutils" />
+<section id="goals">
+<h1>Goals<a class="headerlink" href="#goals" title="Permalink to this headline">¶</a></h1>
+</section>
+<hr class="docutils" />
+<section id="non-goals">
+<h1>Non-Goals<a class="headerlink" href="#non-goals" title="Permalink to this headline">¶</a></h1>
+</section>
+<hr class="docutils" />
+<section id="survey">
+<h1>Survey<a class="headerlink" href="#survey" title="Permalink to this headline">¶</a></h1>
+</section>
+<hr class="docutils" />
+<section id="general-design">
+<h1>General design<a class="headerlink" href="#general-design" title="Permalink to this headline">¶</a></h1>
+</section>
+<hr class="docutils" />
+<section id="detailed-design">
+<h1>Detailed design<a class="headerlink" href="#detailed-design" title="Permalink to this headline">¶</a></h1>
+</section>
+<hr class="docutils" />
+<section id="others">
+<h1>Others<a class="headerlink" href="#others" title="Permalink to this headline">¶</a></h1>
+</section>
+
+
+              </div>
+              
+              
+              <!-- Previous / next buttons -->
+<div class='prev-next-area'>
+</div>
+              
+          </main>
+          
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+  <footer class="footer mt-5 mt-md-0">
+  <div class="container">
+    
+    <div class="footer-item">
+      <p class="copyright">
+    &copy; Copyright 2021, Apache Software Foundation.<br>
+</p>
+    </div>
+    
+    <div class="footer-item">
+      <p class="sphinx-version">
+Created using <a href="http://sphinx-doc.org/">Sphinx</a> 2.4.4.<br>
+</p>
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+    
+  </div>
+</footer>
+  </body>
+</html>
\ No newline at end of file
diff --git a/datafusion/specification/roadmap.html b/datafusion/specification/roadmap.html
index 568e9199b294..9061c62a699c 100644
--- a/datafusion/specification/roadmap.html
+++ b/datafusion/specification/roadmap.html
@@ -3,30 +3,31 @@
 
 <html xmlns="http://www.w3.org/1999/xhtml">
   <head>
-    <meta charset="utf-8" />
+    <meta charset="utf-8" /><meta name="generator" content="Docutils 0.17.1: http://docutils.sourceforge.net/" />
+
     <title>Roadmap &#8212; Arrow Datafusion  documentation</title>
     
-  <link href="../_static/css/theme.css" rel="stylesheet" />
-  <link href="../_static/css/index.c5995385ac14fb8791e8eb36b4908be2.css" rel="stylesheet" />
-
+    <link href="../_static/styles/theme.css?digest=1999514e3f237ded88cf" rel="stylesheet">
+<link href="../_static/styles/pydata-sphinx-theme.css?digest=1999514e3f237ded88cf" rel="stylesheet">
+  
     
-  <link rel="stylesheet"
-    href="../_static/vendor/fontawesome/5.13.0/css/all.min.css">
-  <link rel="preload" as="font" type="font/woff2" crossorigin
-    href="../_static/vendor/fontawesome/5.13.0/webfonts/fa-solid-900.woff2">
-  <link rel="preload" as="font" type="font/woff2" crossorigin
-    href="../_static/vendor/fontawesome/5.13.0/webfonts/fa-brands-400.woff2">
-
+    <link rel="stylesheet"
+      href="../_static/vendor/fontawesome/5.13.0/css/all.min.css">
+    <link rel="preload" as="font" type="font/woff2" crossorigin
+      href="../_static/vendor/fontawesome/5.13.0/webfonts/fa-solid-900.woff2">
+    <link rel="preload" as="font" type="font/woff2" crossorigin
+      href="../_static/vendor/fontawesome/5.13.0/webfonts/fa-brands-400.woff2">
+  
     
       
-
+  
     
-    <link rel="stylesheet" href="../_static/basic.css" type="text/css" />
+    <link rel="stylesheet" href="../_static/styles/pydata-sphinx-theme.css" type="text/css" />
     <link rel="stylesheet" href="../_static/pygments.css" type="text/css" />
     <link rel="stylesheet" type="text/css" href="../_static/theme_overrides.css" />
     
-  <link rel="preload" as="script" href="../_static/js/index.1c5a1a01449ed65a7b51.js">
-
+    <link rel="preload" as="script" href="../_static/scripts/pydata-sphinx-theme.js?digest=1999514e3f237ded88cf">
+  
     <script id="documentation_options" data-url_root="../" src="../_static/documentation_options.js"></script>
     <script src="../_static/jquery.js"></script>
     <script src="../_static/underscore.js"></script>
@@ -37,7 +38,10 @@
     <link rel="next" title="DataFusion’s Invariants" href="invariants.html" />
     <link rel="prev" title="Frequently Asked Questions" href="../user-guide/faq.html" />
     <meta name="viewport" content="width=device-width, initial-scale=1" />
-    <meta name="docsearch:language" content="en" />
+    <meta name="docsearch:language" content="None">
+    
+
+    <!-- Google Analytics -->
     
   </head>
   <body data-spy="scroll" data-target="#bd-toc-nav" data-offset="80">
@@ -53,6 +57,7 @@
             
             <!-- Only show if we have sidebars configured, else just a small margin  -->
             <div class="col-12 col-md-3 bd-sidebar">
+              <div class="sidebar-start-items">
 <a class="navbar-brand" href="../index.html">
   <img src="../_static/images/DataFusion-Logo-Background-White.png" class="logo" alt="logo">
 </a>
@@ -65,7 +70,7 @@
 <nav class="bd-links" id="bd-docs-nav" aria-label="Main navigation">
   <div class="bd-toc-item active">
     
-    <p class="caption">
+    <p>
  <span class="caption-text">
   Supported Environments
  </span>
@@ -174,7 +179,7 @@
   </a>
  </li>
 </ul>
-<p class="caption">
+<p>
  <span class="caption-text">
   User Guide
  </span>
@@ -210,6 +215,11 @@
    </i>
   </label>
   <ul>
+   <li class="toctree-l2">
+    <a class="reference internal" href="../user-guide/sql/sql_status.html">
+     Status
+    </a>
+   </li>
    <li class="toctree-l2">
     <a class="reference internal" href="../user-guide/sql/select.html">
      SELECT syntax
@@ -314,7 +324,7 @@
   </a>
  </li>
 </ul>
-<p class="caption">
+<p>
  <span class="caption-text">
   Specification
  </span>
@@ -335,8 +345,13 @@
    Datafusion output field name semantic
   </a>
  </li>
+ <li class="toctree-l1">
+  <a class="reference internal" href="quarterly_roadmap.html">
+   Roadmap
+  </a>
+ </li>
 </ul>
-<p class="caption">
+<p>
  <span class="caption-text">
   README
  </span>
@@ -353,7 +368,7 @@
   </a>
  </li>
 </ul>
-<p class="caption">
+<p>
  <span class="caption-text">
   Community
  </span>
@@ -379,6 +394,9 @@
     
   </div>
 </nav>
+              </div>
+              <div class="sidebar-end-items">
+              </div>
             </div>
             
           
@@ -516,7 +534,7 @@
 specific language governing permissions and limitations
 under the License.
 -->
-<div class="section" id="roadmap">
+<section id="roadmap">
 <h1>Roadmap<a class="headerlink" href="#roadmap" title="Permalink to this headline">¶</a></h1>
 <p>This document describes high level goals of the DataFusion and
 Ballista development community. It is not meant to restrict
@@ -531,8 +549,8 @@ <h1>Roadmap<a class="headerlink" href="#roadmap" title="Permalink to this headli
 suggest you start a coversation using a github issue or the
 dev&#64;arrow.apache.org mailing list to make review efficient and avoid
 surprises.</p>
-</div>
-<div class="section" id="datafusion">
+</section>
+<section id="datafusion">
 <h1>DataFusion<a class="headerlink" href="#datafusion" title="Permalink to this headline">¶</a></h1>
 <p>DataFusion’s goal is to become the embedded query engine of choice
 for new analytic applications, by leveraging the unique features of
@@ -545,53 +563,51 @@ <h1>DataFusion<a class="headerlink" href="#datafusion" title="Permalink to this
 <li><p>A Procedural API for programatically creating and running execution plans</p></li>
 <li><p>High performance, data race free, erogonomic extensibility points at at every layer</p></li>
 </ol>
-<div class="section" id="additional-sql-language-features">
+<section id="additional-sql-language-features">
 <h2>Additional SQL Language Features<a class="headerlink" href="#additional-sql-language-features" title="Permalink to this headline">¶</a></h2>
 <ul class="simple">
+<li><p>Decimal Support <a class="reference external" href="https://github.com/apache/arrow-datafusion/issues/122">#122</a></p></li>
 <li><p>Complete support list on <a class="reference external" href="https://github.com/apache/arrow-datafusion/blob/master/README.md#status">status</a></p></li>
 <li><p>Timestamp Arithmetic <a class="reference external" href="https://github.com/apache/arrow-datafusion/issues/194">#194</a></p></li>
 <li><p>SQL Parser extension point <a class="reference external" href="https://github.com/apache/arrow-datafusion/issues/533">#533</a></p></li>
 <li><p>Support for nested structures (fields, lists, structs) <a class="reference external" href="https://github.com/apache/arrow-datafusion/issues/119">#119</a></p></li>
-<li><p>Remaining Set Operators (<code class="docutils literal notranslate"><span class="pre">INTERSECT</span></code> / <code class="docutils literal notranslate"><span class="pre">EXCEPT</span></code>) <a class="reference external" href="https://github.com/apache/arrow-datafusion/issues/1082">#1082</a></p></li>
 <li><p>Run all queries from the TPCH benchmark (see <a class="reference external" href="https://github.com/apache/arrow-datafusion/milestone/2">milestone</a> for more details)</p></li>
 </ul>
-</div>
-<div class="section" id="query-optimizer">
+</section>
+<section id="query-optimizer">
 <h2>Query Optimizer<a class="headerlink" href="#query-optimizer" title="Permalink to this headline">¶</a></h2>
 <ul class="simple">
-<li><p>Additional constant folding / partial evaluation <a class="reference external" href="https://github.com/apache/arrow-datafusion/issues/1070">#1070</a></p></li>
 <li><p>More sophisticated cost based optimizer for join ordering</p></li>
 <li><p>Implement advanced query optimization framework (Tokomak) #440</p></li>
 <li><p>Finer optimizations for group by and aggregate functions</p></li>
 </ul>
-</div>
-<div class="section" id="datasources">
+</section>
+<section id="datasources">
 <h2>Datasources<a class="headerlink" href="#datasources" title="Permalink to this headline">¶</a></h2>
 <ul class="simple">
 <li><p>Better support for reading data from remote filesystems (e.g. S3) without caching it locally <a class="reference external" href="https://github.com/apache/arrow-datafusion/issues/907">#907</a> <a class="reference external" href="https://github.com/apache/arrow-datafusion/issues/1060">#1060</a></p></li>
-<li><p>Support for partitioned datasources <a class="reference external" href="https://github.com/apache/arrow-datafusion/issues/1139">#1139</a> and make the integration of other table formats (Delta, Iceberg…) simpler</p></li>
 <li><p>Improve performances of file format datasources (parallelize file listings, async Arrow readers, file chunk prefetching capability…)</p></li>
 </ul>
-</div>
-<div class="section" id="runtime-infrastructure">
+</section>
+<section id="runtime-infrastructure">
 <h2>Runtime / Infrastructure<a class="headerlink" href="#runtime-infrastructure" title="Permalink to this headline">¶</a></h2>
 <ul class="simple">
 <li><p>Migrate to some sort of arrow2 based implementation (see <a class="reference external" href="https://github.com/apache/arrow-datafusion/milestone/3">milestone</a> for more details)</p></li>
 <li><p>Add DataFusion to h2oai/db-benchmark <a class="reference external" href="https://github.com/apache/arrow-datafusion/issues/147">147</a></p></li>
 <li><p>Improve build time <a class="reference external" href="https://github.com/apache/arrow-datafusion/issues/348">348</a></p></li>
 </ul>
-</div>
-<div class="section" id="resource-management">
+</section>
+<section id="resource-management">
 <h2>Resource Management<a class="headerlink" href="#resource-management" title="Permalink to this headline">¶</a></h2>
 <ul class="simple">
 <li><p>Finer grain control and limit of runtime memory <a class="reference external" href="https://github.com/apache/arrow-datafusion/issues/587">#587</a> and CPU usage <a class="reference external" href="https://github.com/apache/arrow-datafusion/issues/64">#54</a></p></li>
 </ul>
-</div>
-<div class="section" id="python-interface">
+</section>
+<section id="python-interface">
 <h2>Python Interface<a class="headerlink" href="#python-interface" title="Permalink to this headline">¶</a></h2>
 <p>TBD</p>
-</div>
-<div class="section" id="datafusion-cli-datafusion-cli">
+</section>
+<section id="datafusion-cli-datafusion-cli">
 <h2>DataFusion CLI (<code class="docutils literal notranslate"><span class="pre">datafusion-cli</span></code>)<a class="headerlink" href="#datafusion-cli-datafusion-cli" title="Permalink to this headline">¶</a></h2>
 <p>Note: There are some additional thoughts on a datafusion-cli vision on <a class="reference external" href="https://github.com/apache/arrow-datafusion/issues/1096#issuecomment-939418770">#1096</a>.</p>
 <ul class="simple">
@@ -601,9 +617,9 @@ <h2>DataFusion CLI (<code class="docutils literal notranslate"><span class="pre"
 <li><p>publishing to apt, brew, and possible NuGet registry so that people can use it more easily</p></li>
 <li><p>adopt a shorter name, like dfcli?</p></li>
 </ul>
-</div>
-</div>
-<div class="section" id="ballista">
+</section>
+</section>
+<section id="ballista">
 <h1>Ballista<a class="headerlink" href="#ballista" title="Permalink to this headline">¶</a></h1>
 <p>Ballista is a distributed compute platform based on Apache Arrow and DataFusion. It provides a query scheduler that
 breaks a physical plan into stages and tasks and then schedules tasks for execution across the available executors
@@ -611,35 +627,46 @@ <h1>Ballista<a class="headerlink" href="#ballista" title="Permalink to this head
 <p>Having Ballista as part of the DataFusion codebase helps ensure that DataFusion remains suitable for distributed
 compute. For example, it helps ensure that physical query plans can be serialized to protobuf format and that they
 remain language-agnostic so that executors can be built in languages other than Rust.</p>
-<div class="section" id="ballista-roadmap">
+<section id="ballista-roadmap">
 <h2>Ballista Roadmap<a class="headerlink" href="#ballista-roadmap" title="Permalink to this headline">¶</a></h2>
-</div>
-<div class="section" id="move-query-scheduler-into-datafusion">
+</section>
+<section id="move-query-scheduler-into-datafusion">
 <h2>Move query scheduler into DataFusion<a class="headerlink" href="#move-query-scheduler-into-datafusion" title="Permalink to this headline">¶</a></h2>
 <p>The Ballista scheduler has some advantages over DataFusion query execution because it doesn’t try to eagerly execute
 the entire query at once but breaks it down into a directionally-acyclic graph (DAG) of stages and executes a
 configurable number of stages and tasks concurrently. It should be possible to push some of this logic down to
 DataFusion so that the same scheduler can be used to scale across cores in-process and across nodes in a cluster.</p>
-</div>
-<div class="section" id="implement-execution-time-cost-based-optimizations-based-on-statistics">
+</section>
+<section id="implement-execution-time-cost-based-optimizations-based-on-statistics">
 <h2>Implement execution-time cost-based optimizations based on statistics<a class="headerlink" href="#implement-execution-time-cost-based-optimizations-based-on-statistics" title="Permalink to this headline">¶</a></h2>
 <p>After the execution of a query stage, accurate statistics are available for the resulting data. These statistics
 could be leveraged by the scheduler to optimize the query during execution. For example, when performing a hash join
 it is desirable to load the smaller side of the join into memory and in some cases we cannot predict which side will
 be smaller until execution time.</p>
-</div>
-</div>
+</section>
+</section>
 
 
               </div>
               
               
-              <div class='prev-next-bottom'>
-                
-    <a class='left-prev' id="prev-link" href="../user-guide/faq.html" title="previous page">Frequently Asked Questions</a>
-    <a class='right-next' id="next-link" href="invariants.html" title="next page">DataFusion’s Invariants</a>
-
-              </div>
+              <!-- Previous / next buttons -->
+<div class='prev-next-area'>
+    <a class='left-prev' id="prev-link" href="../user-guide/faq.html" title="previous page">
+        <i class="fas fa-angle-left"></i>
+        <div class="prev-next-info">
+            <p class="prev-next-subtitle">previous</p>
+            <p class="prev-next-title">Frequently Asked Questions</p>
+        </div>
+    </a>
+    <a class='right-next' id="next-link" href="invariants.html" title="next page">
+    <div class="prev-next-info">
+        <p class="prev-next-subtitle">next</p>
+        <p class="prev-next-title">DataFusion’s Invariants</p>
+    </div>
+    <i class="fas fa-angle-right"></i>
+    </a>
+</div>
               
           </main>
           
@@ -647,20 +674,19 @@ <h2>Implement execution-time cost-based optimizations based on statistics<a clas
       </div>
     </div>
   
-  <script src="../_static/js/index.1c5a1a01449ed65a7b51.js"></script>
-
+    <script src="../_static/scripts/pydata-sphinx-theme.js?digest=1999514e3f237ded88cf"></script>
   <footer class="footer mt-5 mt-md-0">
   <div class="container">
     
     <div class="footer-item">
       <p class="copyright">
-    &copy; Copyright 2021, Apache Software Foundation.<br/>
+    &copy; Copyright 2021, Apache Software Foundation.<br>
 </p>
     </div>
     
     <div class="footer-item">
       <p class="sphinx-version">
-Created using <a href="http://sphinx-doc.org/">Sphinx</a> 2.4.4.<br/>
+Created using <a href="http://sphinx-doc.org/">Sphinx</a> 2.4.4.<br>
 </p>
     </div>
     
diff --git a/datafusion/user-guide/cli.html b/datafusion/user-guide/cli.html
index 697d5035eb72..119dd999581c 100644
--- a/datafusion/user-guide/cli.html
+++ b/datafusion/user-guide/cli.html
@@ -3,30 +3,31 @@
 
 <html xmlns="http://www.w3.org/1999/xhtml">
   <head>
-    <meta charset="utf-8" />
+    <meta charset="utf-8" /><meta name="generator" content="Docutils 0.17.1: http://docutils.sourceforge.net/" />
+
     <title>DataFusion Command-line Interface &#8212; Arrow Datafusion  documentation</title>
     
-  <link href="../_static/css/theme.css" rel="stylesheet" />
-  <link href="../_static/css/index.c5995385ac14fb8791e8eb36b4908be2.css" rel="stylesheet" />
-
+    <link href="../_static/styles/theme.css?digest=1999514e3f237ded88cf" rel="stylesheet">
+<link href="../_static/styles/pydata-sphinx-theme.css?digest=1999514e3f237ded88cf" rel="stylesheet">
+  
     
-  <link rel="stylesheet"
-    href="../_static/vendor/fontawesome/5.13.0/css/all.min.css">
-  <link rel="preload" as="font" type="font/woff2" crossorigin
-    href="../_static/vendor/fontawesome/5.13.0/webfonts/fa-solid-900.woff2">
-  <link rel="preload" as="font" type="font/woff2" crossorigin
-    href="../_static/vendor/fontawesome/5.13.0/webfonts/fa-brands-400.woff2">
-
+    <link rel="stylesheet"
+      href="../_static/vendor/fontawesome/5.13.0/css/all.min.css">
+    <link rel="preload" as="font" type="font/woff2" crossorigin
+      href="../_static/vendor/fontawesome/5.13.0/webfonts/fa-solid-900.woff2">
+    <link rel="preload" as="font" type="font/woff2" crossorigin
+      href="../_static/vendor/fontawesome/5.13.0/webfonts/fa-brands-400.woff2">
+  
     
       
-
+  
     
-    <link rel="stylesheet" href="../_static/basic.css" type="text/css" />
+    <link rel="stylesheet" href="../_static/styles/pydata-sphinx-theme.css" type="text/css" />
     <link rel="stylesheet" href="../_static/pygments.css" type="text/css" />
     <link rel="stylesheet" type="text/css" href="../_static/theme_overrides.css" />
     
-  <link rel="preload" as="script" href="../_static/js/index.1c5a1a01449ed65a7b51.js">
-
+    <link rel="preload" as="script" href="../_static/scripts/pydata-sphinx-theme.js?digest=1999514e3f237ded88cf">
+  
     <script id="documentation_options" data-url_root="../" src="../_static/documentation_options.js"></script>
     <script src="../_static/jquery.js"></script>
     <script src="../_static/underscore.js"></script>
@@ -37,7 +38,10 @@
     <link rel="next" title="SQL Reference" href="sql/index.html" />
     <link rel="prev" title="Using DataFusion as a library" href="library.html" />
     <meta name="viewport" content="width=device-width, initial-scale=1" />
-    <meta name="docsearch:language" content="en" />
+    <meta name="docsearch:language" content="None">
+    
+
+    <!-- Google Analytics -->
     
   </head>
   <body data-spy="scroll" data-target="#bd-toc-nav" data-offset="80">
@@ -53,6 +57,7 @@
             
             <!-- Only show if we have sidebars configured, else just a small margin  -->
             <div class="col-12 col-md-3 bd-sidebar">
+              <div class="sidebar-start-items">
 <a class="navbar-brand" href="../index.html">
   <img src="../_static/images/DataFusion-Logo-Background-White.png" class="logo" alt="logo">
 </a>
@@ -65,7 +70,7 @@
 <nav class="bd-links" id="bd-docs-nav" aria-label="Main navigation">
   <div class="bd-toc-item active">
     
-    <p class="caption">
+    <p>
  <span class="caption-text">
   Supported Environments
  </span>
@@ -174,7 +179,7 @@
   </a>
  </li>
 </ul>
-<p class="caption">
+<p>
  <span class="caption-text">
   User Guide
  </span>
@@ -210,6 +215,11 @@
    </i>
   </label>
   <ul>
+   <li class="toctree-l2">
+    <a class="reference internal" href="sql/sql_status.html">
+     Status
+    </a>
+   </li>
    <li class="toctree-l2">
     <a class="reference internal" href="sql/select.html">
      SELECT syntax
@@ -314,12 +324,17 @@
   </a>
  </li>
 </ul>
-<p class="caption">
+<p>
  <span class="caption-text">
   Specification
  </span>
 </p>
 <ul class="nav bd-sidenav">
+ <li class="toctree-l1">
+  <a class="reference internal" href="../specification/roadmap.html">
+   Roadmap
+  </a>
+ </li>
  <li class="toctree-l1">
   <a class="reference internal" href="../specification/invariants.html">
    DataFusion’s Invariants
@@ -330,8 +345,13 @@
    Datafusion output field name semantic
   </a>
  </li>
+ <li class="toctree-l1">
+  <a class="reference internal" href="../specification/quarterly_roadmap.html">
+   Roadmap
+  </a>
+ </li>
 </ul>
-<p class="caption">
+<p>
  <span class="caption-text">
   README
  </span>
@@ -348,7 +368,7 @@
   </a>
  </li>
 </ul>
-<p class="caption">
+<p>
  <span class="caption-text">
   Community
  </span>
@@ -364,11 +384,19 @@
    Issue tracker
   </a>
  </li>
+ <li class="toctree-l1">
+  <a class="reference external" href="https://github.com/apache/arrow-datafusion/blob/master/CODE_OF_CONDUCT.md">
+   Code of conduct
+  </a>
+ </li>
 </ul>
 
     
   </div>
 </nav>
+              </div>
+              <div class="sidebar-end-items">
+              </div>
             </div>
             
           
@@ -395,6 +423,11 @@
    Ballista
   </a>
  </li>
+ <li class="toc-h2 nav-item toc-entry">
+  <a class="reference internal nav-link" href="#cli-commands">
+   Cli commands
+  </a>
+ </li>
 </ul>
 
 </nav>
@@ -441,7 +474,7 @@
   specific language governing permissions and limitations
   under the License.
 -->
-<div class="section" id="datafusion-command-line-interface">
+<section id="datafusion-command-line-interface">
 <h1>DataFusion Command-line Interface<a class="headerlink" href="#datafusion-command-line-interface" title="Permalink to this headline">¶</a></h1>
 <p>The DataFusion CLI allows SQL queries to be executed by an in-process DataFusion context, or by a distributed
 Ballista context.</p>
@@ -462,7 +495,7 @@ <h1>DataFusion Command-line Interface<a class="headerlink" href="#datafusion-com
         <span class="o">--</span><span class="n">port</span> <span class="o">&lt;</span><span class="n">port</span><span class="o">&gt;</span>                <span class="n">Ballista</span> <span class="n">scheduler</span> <span class="n">port</span>
 </pre></div>
 </div>
-<div class="section" id="example">
+<section id="example">
 <h2>Example<a class="headerlink" href="#example" title="Permalink to this headline">¶</a></h2>
 <p>Create a CSV file to query.</p>
 <div class="highlight-bash notranslate"><div class="highlight"><pre><span></span>$ <span class="nb">echo</span> <span class="s2">&quot;1,2&quot;</span> &gt; data.csv
@@ -484,26 +517,83 @@ <h2>Example<a class="headerlink" href="#example" title="Permalink to this headli
 <span class="m">1</span> row <span class="k">in</span> set. Query took <span class="m">0</span>.017 seconds.
 </pre></div>
 </div>
-</div>
-<div class="section" id="ballista">
+</section>
+<section id="ballista">
 <h2>Ballista<a class="headerlink" href="#ballista" title="Permalink to this headline">¶</a></h2>
 <p>The DataFusion CLI can also connect to a Ballista scheduler for query execution.</p>
 <div class="highlight-bash notranslate"><div class="highlight"><pre><span></span>datafusion-cli --host localhost --port <span class="m">50050</span>
 </pre></div>
 </div>
+</section>
+<section id="cli-commands">
+<h2>Cli commands<a class="headerlink" href="#cli-commands" title="Permalink to this headline">¶</a></h2>
+<p>Available commands inside DataFusion CLI are:</p>
+<ul class="simple">
+<li><p>Quit</p></li>
+</ul>
+<div class="highlight-bash notranslate"><div class="highlight"><pre><span></span>&gt; <span class="se">\q</span>
+</pre></div>
+</div>
+<ul class="simple">
+<li><p>Help</p></li>
+</ul>
+<div class="highlight-bash notranslate"><div class="highlight"><pre><span></span>&gt; <span class="se">\?</span>
+</pre></div>
+</div>
+<ul class="simple">
+<li><p>ListTables</p></li>
+</ul>
+<div class="highlight-bash notranslate"><div class="highlight"><pre><span></span>&gt; <span class="se">\d</span>
+</pre></div>
+</div>
+<ul class="simple">
+<li><p>DescribeTable</p></li>
+</ul>
+<div class="highlight-bash notranslate"><div class="highlight"><pre><span></span>&gt; <span class="se">\d</span> table_name
+</pre></div>
+</div>
+<ul class="simple">
+<li><p>QuietMode</p></li>
+</ul>
+<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="o">&gt;</span> \<span class="n">quiet</span> <span class="p">[</span><span class="n">true</span><span class="o">|</span><span class="n">false</span><span class="p">]</span>
+</pre></div>
+</div>
+<ul class="simple">
+<li><p>list function</p></li>
+</ul>
+<div class="highlight-bash notranslate"><div class="highlight"><pre><span></span>&gt; <span class="se">\h</span>
+</pre></div>
 </div>
+<ul class="simple">
+<li><p>Search and describe function</p></li>
+</ul>
+<div class="highlight-bash notranslate"><div class="highlight"><pre><span></span>&gt; <span class="se">\h</span> function_table
+</pre></div>
 </div>
+</section>
+</section>
 
 
               </div>
               
               
-              <div class='prev-next-bottom'>
-                
-    <a class='left-prev' id="prev-link" href="library.html" title="previous page">Using DataFusion as a library</a>
-    <a class='right-next' id="next-link" href="sql/index.html" title="next page">SQL Reference</a>
-
-              </div>
+              <!-- Previous / next buttons -->
+<div class='prev-next-area'>
+    <a class='left-prev' id="prev-link" href="library.html" title="previous page">
+        <i class="fas fa-angle-left"></i>
+        <div class="prev-next-info">
+            <p class="prev-next-subtitle">previous</p>
+            <p class="prev-next-title">Using DataFusion as a library</p>
+        </div>
+    </a>
+    <a class='right-next' id="next-link" href="sql/index.html" title="next page">
+    <div class="prev-next-info">
+        <p class="prev-next-subtitle">next</p>
+        <p class="prev-next-title">SQL Reference</p>
+    </div>
+    <i class="fas fa-angle-right"></i>
+    </a>
+</div>
               
           </main>
           
@@ -511,20 +601,19 @@ <h2>Ballista<a class="headerlink" href="#ballista" title="Permalink to this head
       </div>
     </div>
   
-  <script src="../_static/js/index.1c5a1a01449ed65a7b51.js"></script>
-
+    <script src="../_static/scripts/pydata-sphinx-theme.js?digest=1999514e3f237ded88cf"></script>
   <footer class="footer mt-5 mt-md-0">
   <div class="container">
     
     <div class="footer-item">
       <p class="copyright">
-    &copy; Copyright 2021, Apache Software Foundation.<br/>
+    &copy; Copyright 2021, Apache Software Foundation.<br>
 </p>
     </div>
     
     <div class="footer-item">
       <p class="sphinx-version">
-Created using <a href="http://sphinx-doc.org/">Sphinx</a> 2.4.4.<br/>
+Created using <a href="http://sphinx-doc.org/">Sphinx</a> 2.4.4.<br>
 </p>
     </div>
     
diff --git a/datafusion/user-guide/distributed/clients/index.html b/datafusion/user-guide/distributed/clients/index.html
index 334e93abe263..32b52cf63261 100644
--- a/datafusion/user-guide/distributed/clients/index.html
+++ b/datafusion/user-guide/distributed/clients/index.html
@@ -3,30 +3,31 @@
 
 <html xmlns="http://www.w3.org/1999/xhtml">
   <head>
-    <meta charset="utf-8" />
+    <meta charset="utf-8" /><meta name="generator" content="Docutils 0.17.1: http://docutils.sourceforge.net/" />
+
     <title>Clients &#8212; Arrow Datafusion  documentation</title>
     
-  <link href="../../../_static/css/theme.css" rel="stylesheet" />
-  <link href="../../../_static/css/index.c5995385ac14fb8791e8eb36b4908be2.css" rel="stylesheet" />
-
+    <link href="../../../_static/styles/theme.css?digest=1999514e3f237ded88cf" rel="stylesheet">
+<link href="../../../_static/styles/pydata-sphinx-theme.css?digest=1999514e3f237ded88cf" rel="stylesheet">
+  
     
-  <link rel="stylesheet"
-    href="../../../_static/vendor/fontawesome/5.13.0/css/all.min.css">
-  <link rel="preload" as="font" type="font/woff2" crossorigin
-    href="../../../_static/vendor/fontawesome/5.13.0/webfonts/fa-solid-900.woff2">
-  <link rel="preload" as="font" type="font/woff2" crossorigin
-    href="../../../_static/vendor/fontawesome/5.13.0/webfonts/fa-brands-400.woff2">
-
+    <link rel="stylesheet"
+      href="../../../_static/vendor/fontawesome/5.13.0/css/all.min.css">
+    <link rel="preload" as="font" type="font/woff2" crossorigin
+      href="../../../_static/vendor/fontawesome/5.13.0/webfonts/fa-solid-900.woff2">
+    <link rel="preload" as="font" type="font/woff2" crossorigin
+      href="../../../_static/vendor/fontawesome/5.13.0/webfonts/fa-brands-400.woff2">
+  
     
       
-
+  
     
-    <link rel="stylesheet" href="../../../_static/basic.css" type="text/css" />
+    <link rel="stylesheet" href="../../../_static/styles/pydata-sphinx-theme.css" type="text/css" />
     <link rel="stylesheet" href="../../../_static/pygments.css" type="text/css" />
     <link rel="stylesheet" type="text/css" href="../../../_static/theme_overrides.css" />
     
-  <link rel="preload" as="script" href="../../../_static/js/index.1c5a1a01449ed65a7b51.js">
-
+    <link rel="preload" as="script" href="../../../_static/scripts/pydata-sphinx-theme.js?digest=1999514e3f237ded88cf">
+  
     <script id="documentation_options" data-url_root="../../../" src="../../../_static/documentation_options.js"></script>
     <script src="../../../_static/jquery.js"></script>
     <script src="../../../_static/underscore.js"></script>
@@ -37,7 +38,10 @@
     <link rel="next" title="Ballista Rust Client" href="rust.html" />
     <link rel="prev" title="Configuration" href="../deployment/configuration.html" />
     <meta name="viewport" content="width=device-width, initial-scale=1" />
-    <meta name="docsearch:language" content="en" />
+    <meta name="docsearch:language" content="None">
+    
+
+    <!-- Google Analytics -->
     
   </head>
   <body data-spy="scroll" data-target="#bd-toc-nav" data-offset="80">
@@ -53,6 +57,7 @@
             
             <!-- Only show if we have sidebars configured, else just a small margin  -->
             <div class="col-12 col-md-3 bd-sidebar">
+              <div class="sidebar-start-items">
 <a class="navbar-brand" href="../../../index.html">
   <img src="../../../_static/images/DataFusion-Logo-Background-White.png" class="logo" alt="logo">
 </a>
@@ -65,7 +70,7 @@
 <nav class="bd-links" id="bd-docs-nav" aria-label="Main navigation">
   <div class="bd-toc-item active">
     
-    <p class="caption">
+    <p>
  <span class="caption-text">
   Supported Environments
  </span>
@@ -174,7 +179,7 @@
   </a>
  </li>
 </ul>
-<p class="caption">
+<p>
  <span class="caption-text">
   User Guide
  </span>
@@ -210,6 +215,11 @@
    </i>
   </label>
   <ul>
+   <li class="toctree-l2">
+    <a class="reference internal" href="../../sql/sql_status.html">
+     Status
+    </a>
+   </li>
    <li class="toctree-l2">
     <a class="reference internal" href="../../sql/select.html">
      SELECT syntax
@@ -314,12 +324,17 @@
   </a>
  </li>
 </ul>
-<p class="caption">
+<p>
  <span class="caption-text">
   Specification
  </span>
 </p>
 <ul class="nav bd-sidenav">
+ <li class="toctree-l1">
+  <a class="reference internal" href="../../../specification/roadmap.html">
+   Roadmap
+  </a>
+ </li>
  <li class="toctree-l1">
   <a class="reference internal" href="../../../specification/invariants.html">
    DataFusion’s Invariants
@@ -330,8 +345,13 @@
    Datafusion output field name semantic
   </a>
  </li>
+ <li class="toctree-l1">
+  <a class="reference internal" href="../../../specification/quarterly_roadmap.html">
+   Roadmap
+  </a>
+ </li>
 </ul>
-<p class="caption">
+<p>
  <span class="caption-text">
   README
  </span>
@@ -348,7 +368,7 @@
   </a>
  </li>
 </ul>
-<p class="caption">
+<p>
  <span class="caption-text">
   Community
  </span>
@@ -364,11 +384,19 @@
    Issue tracker
   </a>
  </li>
+ <li class="toctree-l1">
+  <a class="reference external" href="https://github.com/apache/arrow-datafusion/blob/master/CODE_OF_CONDUCT.md">
+   Code of conduct
+  </a>
+ </li>
 </ul>
 
     
   </div>
 </nav>
+              </div>
+              <div class="sidebar-end-items">
+              </div>
             </div>
             
           
@@ -408,7 +436,7 @@
               
               <div>
                 
-  <div class="section" id="clients">
+  <section id="clients">
 <h1>Clients<a class="headerlink" href="#clients" title="Permalink to this headline">¶</a></h1>
 <div class="toctree-wrapper compound">
 <ul>
@@ -416,18 +444,29 @@ <h1>Clients<a class="headerlink" href="#clients" title="Permalink to this headli
 <li class="toctree-l1"><a class="reference internal" href="python.html">Python</a></li>
 </ul>
 </div>
-</div>
+</section>
 
 
               </div>
               
               
-              <div class='prev-next-bottom'>
-                
-    <a class='left-prev' id="prev-link" href="../deployment/configuration.html" title="previous page">Configuration</a>
-    <a class='right-next' id="next-link" href="rust.html" title="next page">Ballista Rust Client</a>
-
-              </div>
+              <!-- Previous / next buttons -->
+<div class='prev-next-area'>
+    <a class='left-prev' id="prev-link" href="../deployment/configuration.html" title="previous page">
+        <i class="fas fa-angle-left"></i>
+        <div class="prev-next-info">
+            <p class="prev-next-subtitle">previous</p>
+            <p class="prev-next-title">Configuration</p>
+        </div>
+    </a>
+    <a class='right-next' id="next-link" href="rust.html" title="next page">
+    <div class="prev-next-info">
+        <p class="prev-next-subtitle">next</p>
+        <p class="prev-next-title">Ballista Rust Client</p>
+    </div>
+    <i class="fas fa-angle-right"></i>
+    </a>
+</div>
               
           </main>
           
@@ -435,20 +474,19 @@ <h1>Clients<a class="headerlink" href="#clients" title="Permalink to this headli
       </div>
     </div>
   
-  <script src="../../../_static/js/index.1c5a1a01449ed65a7b51.js"></script>
-
+    <script src="../../../_static/scripts/pydata-sphinx-theme.js?digest=1999514e3f237ded88cf"></script>
   <footer class="footer mt-5 mt-md-0">
   <div class="container">
     
     <div class="footer-item">
       <p class="copyright">
-    &copy; Copyright 2021, Apache Software Foundation.<br/>
+    &copy; Copyright 2021, Apache Software Foundation.<br>
 </p>
     </div>
     
     <div class="footer-item">
       <p class="sphinx-version">
-Created using <a href="http://sphinx-doc.org/">Sphinx</a> 2.4.4.<br/>
+Created using <a href="http://sphinx-doc.org/">Sphinx</a> 2.4.4.<br>
 </p>
     </div>
     
diff --git a/datafusion/user-guide/distributed/clients/python.html b/datafusion/user-guide/distributed/clients/python.html
index 1cb1d54e2986..91923ef0c925 100644
--- a/datafusion/user-guide/distributed/clients/python.html
+++ b/datafusion/user-guide/distributed/clients/python.html
@@ -3,30 +3,31 @@
 
 <html xmlns="http://www.w3.org/1999/xhtml">
   <head>
-    <meta charset="utf-8" />
+    <meta charset="utf-8" /><meta name="generator" content="Docutils 0.17.1: http://docutils.sourceforge.net/" />
+
     <title>Python &#8212; Arrow Datafusion  documentation</title>
     
-  <link href="../../../_static/css/theme.css" rel="stylesheet" />
-  <link href="../../../_static/css/index.c5995385ac14fb8791e8eb36b4908be2.css" rel="stylesheet" />
-
+    <link href="../../../_static/styles/theme.css?digest=1999514e3f237ded88cf" rel="stylesheet">
+<link href="../../../_static/styles/pydata-sphinx-theme.css?digest=1999514e3f237ded88cf" rel="stylesheet">
+  
     
-  <link rel="stylesheet"
-    href="../../../_static/vendor/fontawesome/5.13.0/css/all.min.css">
-  <link rel="preload" as="font" type="font/woff2" crossorigin
-    href="../../../_static/vendor/fontawesome/5.13.0/webfonts/fa-solid-900.woff2">
-  <link rel="preload" as="font" type="font/woff2" crossorigin
-    href="../../../_static/vendor/fontawesome/5.13.0/webfonts/fa-brands-400.woff2">
-
+    <link rel="stylesheet"
+      href="../../../_static/vendor/fontawesome/5.13.0/css/all.min.css">
+    <link rel="preload" as="font" type="font/woff2" crossorigin
+      href="../../../_static/vendor/fontawesome/5.13.0/webfonts/fa-solid-900.woff2">
+    <link rel="preload" as="font" type="font/woff2" crossorigin
+      href="../../../_static/vendor/fontawesome/5.13.0/webfonts/fa-brands-400.woff2">
+  
     
       
-
+  
     
-    <link rel="stylesheet" href="../../../_static/basic.css" type="text/css" />
+    <link rel="stylesheet" href="../../../_static/styles/pydata-sphinx-theme.css" type="text/css" />
     <link rel="stylesheet" href="../../../_static/pygments.css" type="text/css" />
     <link rel="stylesheet" type="text/css" href="../../../_static/theme_overrides.css" />
     
-  <link rel="preload" as="script" href="../../../_static/js/index.1c5a1a01449ed65a7b51.js">
-
+    <link rel="preload" as="script" href="../../../_static/scripts/pydata-sphinx-theme.js?digest=1999514e3f237ded88cf">
+  
     <script id="documentation_options" data-url_root="../../../" src="../../../_static/documentation_options.js"></script>
     <script src="../../../_static/jquery.js"></script>
     <script src="../../../_static/underscore.js"></script>
@@ -37,7 +38,10 @@
     <link rel="next" title="Frequently Asked Questions" href="../../faq.html" />
     <link rel="prev" title="Ballista Rust Client" href="rust.html" />
     <meta name="viewport" content="width=device-width, initial-scale=1" />
-    <meta name="docsearch:language" content="en" />
+    <meta name="docsearch:language" content="None">
+    
+
+    <!-- Google Analytics -->
     
   </head>
   <body data-spy="scroll" data-target="#bd-toc-nav" data-offset="80">
@@ -53,6 +57,7 @@
             
             <!-- Only show if we have sidebars configured, else just a small margin  -->
             <div class="col-12 col-md-3 bd-sidebar">
+              <div class="sidebar-start-items">
 <a class="navbar-brand" href="../../../index.html">
   <img src="../../../_static/images/DataFusion-Logo-Background-White.png" class="logo" alt="logo">
 </a>
@@ -65,7 +70,7 @@
 <nav class="bd-links" id="bd-docs-nav" aria-label="Main navigation">
   <div class="bd-toc-item active">
     
-    <p class="caption">
+    <p>
  <span class="caption-text">
   Supported Environments
  </span>
@@ -174,7 +179,7 @@
   </a>
  </li>
 </ul>
-<p class="caption">
+<p>
  <span class="caption-text">
   User Guide
  </span>
@@ -210,6 +215,11 @@
    </i>
   </label>
   <ul>
+   <li class="toctree-l2">
+    <a class="reference internal" href="../../sql/sql_status.html">
+     Status
+    </a>
+   </li>
    <li class="toctree-l2">
     <a class="reference internal" href="../../sql/select.html">
      SELECT syntax
@@ -314,12 +324,17 @@
   </a>
  </li>
 </ul>
-<p class="caption">
+<p>
  <span class="caption-text">
   Specification
  </span>
 </p>
 <ul class="nav bd-sidenav">
+ <li class="toctree-l1">
+  <a class="reference internal" href="../../../specification/roadmap.html">
+   Roadmap
+  </a>
+ </li>
  <li class="toctree-l1">
   <a class="reference internal" href="../../../specification/invariants.html">
    DataFusion’s Invariants
@@ -330,8 +345,13 @@
    Datafusion output field name semantic
   </a>
  </li>
+ <li class="toctree-l1">
+  <a class="reference internal" href="../../../specification/quarterly_roadmap.html">
+   Roadmap
+  </a>
+ </li>
 </ul>
-<p class="caption">
+<p>
  <span class="caption-text">
   README
  </span>
@@ -348,7 +368,7 @@
   </a>
  </li>
 </ul>
-<p class="caption">
+<p>
  <span class="caption-text">
   Community
  </span>
@@ -364,11 +384,19 @@
    Issue tracker
   </a>
  </li>
+ <li class="toctree-l1">
+  <a class="reference external" href="https://github.com/apache/arrow-datafusion/blob/master/CODE_OF_CONDUCT.md">
+   Code of conduct
+  </a>
+ </li>
 </ul>
 
     
   </div>
 </nav>
+              </div>
+              <div class="sidebar-end-items">
+              </div>
             </div>
             
           
@@ -426,21 +454,32 @@
   specific language governing permissions and limitations
   under the License.
 -->
-<div class="section" id="python">
+<section id="python">
 <h1>Python<a class="headerlink" href="#python" title="Permalink to this headline">¶</a></h1>
 <p>Coming soon.</p>
-</div>
+</section>
 
 
               </div>
               
               
-              <div class='prev-next-bottom'>
-                
-    <a class='left-prev' id="prev-link" href="rust.html" title="previous page">Ballista Rust Client</a>
-    <a class='right-next' id="next-link" href="../../faq.html" title="next page">Frequently Asked Questions</a>
-
-              </div>
+              <!-- Previous / next buttons -->
+<div class='prev-next-area'>
+    <a class='left-prev' id="prev-link" href="rust.html" title="previous page">
+        <i class="fas fa-angle-left"></i>
+        <div class="prev-next-info">
+            <p class="prev-next-subtitle">previous</p>
+            <p class="prev-next-title">Ballista Rust Client</p>
+        </div>
+    </a>
+    <a class='right-next' id="next-link" href="../../faq.html" title="next page">
+    <div class="prev-next-info">
+        <p class="prev-next-subtitle">next</p>
+        <p class="prev-next-title">Frequently Asked Questions</p>
+    </div>
+    <i class="fas fa-angle-right"></i>
+    </a>
+</div>
               
           </main>
           
@@ -448,20 +487,19 @@ <h1>Python<a class="headerlink" href="#python" title="Permalink to this headline
       </div>
     </div>
   
-  <script src="../../../_static/js/index.1c5a1a01449ed65a7b51.js"></script>
-
+    <script src="../../../_static/scripts/pydata-sphinx-theme.js?digest=1999514e3f237ded88cf"></script>
   <footer class="footer mt-5 mt-md-0">
   <div class="container">
     
     <div class="footer-item">
       <p class="copyright">
-    &copy; Copyright 2021, Apache Software Foundation.<br/>
+    &copy; Copyright 2021, Apache Software Foundation.<br>
 </p>
     </div>
     
     <div class="footer-item">
       <p class="sphinx-version">
-Created using <a href="http://sphinx-doc.org/">Sphinx</a> 2.4.4.<br/>
+Created using <a href="http://sphinx-doc.org/">Sphinx</a> 2.4.4.<br>
 </p>
     </div>
     
diff --git a/datafusion/user-guide/distributed/clients/rust.html b/datafusion/user-guide/distributed/clients/rust.html
index bf4a9ba2d360..b19f382430b3 100644
--- a/datafusion/user-guide/distributed/clients/rust.html
+++ b/datafusion/user-guide/distributed/clients/rust.html
@@ -3,30 +3,31 @@
 
 <html xmlns="http://www.w3.org/1999/xhtml">
   <head>
-    <meta charset="utf-8" />
+    <meta charset="utf-8" /><meta name="generator" content="Docutils 0.17.1: http://docutils.sourceforge.net/" />
+
     <title>Ballista Rust Client &#8212; Arrow Datafusion  documentation</title>
     
-  <link href="../../../_static/css/theme.css" rel="stylesheet" />
-  <link href="../../../_static/css/index.c5995385ac14fb8791e8eb36b4908be2.css" rel="stylesheet" />
-
+    <link href="../../../_static/styles/theme.css?digest=1999514e3f237ded88cf" rel="stylesheet">
+<link href="../../../_static/styles/pydata-sphinx-theme.css?digest=1999514e3f237ded88cf" rel="stylesheet">
+  
     
-  <link rel="stylesheet"
-    href="../../../_static/vendor/fontawesome/5.13.0/css/all.min.css">
-  <link rel="preload" as="font" type="font/woff2" crossorigin
-    href="../../../_static/vendor/fontawesome/5.13.0/webfonts/fa-solid-900.woff2">
-  <link rel="preload" as="font" type="font/woff2" crossorigin
-    href="../../../_static/vendor/fontawesome/5.13.0/webfonts/fa-brands-400.woff2">
-
+    <link rel="stylesheet"
+      href="../../../_static/vendor/fontawesome/5.13.0/css/all.min.css">
+    <link rel="preload" as="font" type="font/woff2" crossorigin
+      href="../../../_static/vendor/fontawesome/5.13.0/webfonts/fa-solid-900.woff2">
+    <link rel="preload" as="font" type="font/woff2" crossorigin
+      href="../../../_static/vendor/fontawesome/5.13.0/webfonts/fa-brands-400.woff2">
+  
     
       
-
+  
     
-    <link rel="stylesheet" href="../../../_static/basic.css" type="text/css" />
+    <link rel="stylesheet" href="../../../_static/styles/pydata-sphinx-theme.css" type="text/css" />
     <link rel="stylesheet" href="../../../_static/pygments.css" type="text/css" />
     <link rel="stylesheet" type="text/css" href="../../../_static/theme_overrides.css" />
     
-  <link rel="preload" as="script" href="../../../_static/js/index.1c5a1a01449ed65a7b51.js">
-
+    <link rel="preload" as="script" href="../../../_static/scripts/pydata-sphinx-theme.js?digest=1999514e3f237ded88cf">
+  
     <script id="documentation_options" data-url_root="../../../" src="../../../_static/documentation_options.js"></script>
     <script src="../../../_static/jquery.js"></script>
     <script src="../../../_static/underscore.js"></script>
@@ -37,7 +38,10 @@
     <link rel="next" title="Python" href="python.html" />
     <link rel="prev" title="Clients" href="index.html" />
     <meta name="viewport" content="width=device-width, initial-scale=1" />
-    <meta name="docsearch:language" content="en" />
+    <meta name="docsearch:language" content="None">
+    
+
+    <!-- Google Analytics -->
     
   </head>
   <body data-spy="scroll" data-target="#bd-toc-nav" data-offset="80">
@@ -53,6 +57,7 @@
             
             <!-- Only show if we have sidebars configured, else just a small margin  -->
             <div class="col-12 col-md-3 bd-sidebar">
+              <div class="sidebar-start-items">
 <a class="navbar-brand" href="../../../index.html">
   <img src="../../../_static/images/DataFusion-Logo-Background-White.png" class="logo" alt="logo">
 </a>
@@ -65,7 +70,7 @@
 <nav class="bd-links" id="bd-docs-nav" aria-label="Main navigation">
   <div class="bd-toc-item active">
     
-    <p class="caption">
+    <p>
  <span class="caption-text">
   Supported Environments
  </span>
@@ -174,7 +179,7 @@
   </a>
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 </ul>
-<p class="caption">
+<p>
  <span class="caption-text">
   User Guide
  </span>
@@ -210,6 +215,11 @@
    </i>
   </label>
   <ul>
+   <li class="toctree-l2">
+    <a class="reference internal" href="../../sql/sql_status.html">
+     Status
+    </a>
+   </li>
    <li class="toctree-l2">
     <a class="reference internal" href="../../sql/select.html">
      SELECT syntax
@@ -314,12 +324,17 @@
   </a>
  </li>
 </ul>
-<p class="caption">
+<p>
  <span class="caption-text">
   Specification
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 </p>
 <ul class="nav bd-sidenav">
+ <li class="toctree-l1">
+  <a class="reference internal" href="../../../specification/roadmap.html">
+   Roadmap
+  </a>
+ </li>
  <li class="toctree-l1">
   <a class="reference internal" href="../../../specification/invariants.html">
    DataFusion’s Invariants
@@ -330,8 +345,13 @@
    Datafusion output field name semantic
   </a>
  </li>
+ <li class="toctree-l1">
+  <a class="reference internal" href="../../../specification/quarterly_roadmap.html">
+   Roadmap
+  </a>
+ </li>
 </ul>
-<p class="caption">
+<p>
  <span class="caption-text">
   README
  </span>
@@ -348,7 +368,7 @@
   </a>
  </li>
 </ul>
-<p class="caption">
+<p>
  <span class="caption-text">
   Community
  </span>
@@ -364,11 +384,19 @@
    Issue tracker
   </a>
  </li>
+ <li class="toctree-l1">
+  <a class="reference external" href="https://github.com/apache/arrow-datafusion/blob/master/CODE_OF_CONDUCT.md">
+   Code of conduct
+  </a>
+ </li>
 </ul>
 
     
   </div>
 </nav>
+              </div>
+              <div class="sidebar-end-items">
+              </div>
             </div>
             
           
@@ -426,7 +454,7 @@
   specific language governing permissions and limitations
   under the License.
 -->
-<div class="section" id="ballista-rust-client">
+<section id="ballista-rust-client">
 <h1>Ballista Rust Client<a class="headerlink" href="#ballista-rust-client" title="Permalink to this headline">¶</a></h1>
 <p>Ballista usage is very similar to DataFusion. Tha main difference is that the starting point is a <code class="docutils literal notranslate"><span class="pre">BallistaContext</span></code>
 instead of the DataFusion <code class="docutils literal notranslate"><span class="pre">ExecutionContext</span></code>. Ballista uses the same DataFrame API as DataFusion.</p>
@@ -500,18 +528,29 @@ <h1>Ballista Rust Client<a class="headerlink" href="#ballista-rust-client" title
 <span class="p">}</span><span class="w"></span>
 </pre></div>
 </div>
-</div>
+</section>
 
 
               </div>
               
               
-              <div class='prev-next-bottom'>
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-    <a class='left-prev' id="prev-link" href="index.html" title="previous page">Clients</a>
-    <a class='right-next' id="next-link" href="python.html" title="next page">Python</a>
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+              <!-- Previous / next buttons -->
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+        <div class="prev-next-info">
+            <p class="prev-next-subtitle">previous</p>
+            <p class="prev-next-title">Clients</p>
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+        <p class="prev-next-subtitle">next</p>
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@@ -519,20 +558,19 @@ <h1>Ballista Rust Client<a class="headerlink" href="#ballista-rust-client" title
       </div>
     </div>
   
-  <script src="../../../_static/js/index.1c5a1a01449ed65a7b51.js"></script>
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+    <script src="../../../_static/scripts/pydata-sphinx-theme.js?digest=1999514e3f237ded88cf"></script>
   <footer class="footer mt-5 mt-md-0">
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       <p class="copyright">
-    &copy; Copyright 2021, Apache Software Foundation.<br/>
+    &copy; Copyright 2021, Apache Software Foundation.<br>
 </p>
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     <div class="footer-item">
       <p class="sphinx-version">
-Created using <a href="http://sphinx-doc.org/">Sphinx</a> 2.4.4.<br/>
+Created using <a href="http://sphinx-doc.org/">Sphinx</a> 2.4.4.<br>
 </p>
     </div>
     
diff --git a/datafusion/user-guide/distributed/deployment/cargo-install.html b/datafusion/user-guide/distributed/deployment/cargo-install.html
index 7e0fa34f05a1..57a691e19243 100644
--- a/datafusion/user-guide/distributed/deployment/cargo-install.html
+++ b/datafusion/user-guide/distributed/deployment/cargo-install.html
@@ -3,30 +3,31 @@
 
 <html xmlns="http://www.w3.org/1999/xhtml">
   <head>
-    <meta charset="utf-8" />
+    <meta charset="utf-8" /><meta name="generator" content="Docutils 0.17.1: http://docutils.sourceforge.net/" />
+
     <title>Deploying a standalone Ballista cluster using cargo install &#8212; Arrow Datafusion  documentation</title>
     
-  <link href="../../../_static/css/theme.css" rel="stylesheet" />
-  <link href="../../../_static/css/index.c5995385ac14fb8791e8eb36b4908be2.css" rel="stylesheet" />
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+    <link href="../../../_static/styles/theme.css?digest=1999514e3f237ded88cf" rel="stylesheet">
+<link href="../../../_static/styles/pydata-sphinx-theme.css?digest=1999514e3f237ded88cf" rel="stylesheet">
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-  <link rel="stylesheet"
-    href="../../../_static/vendor/fontawesome/5.13.0/css/all.min.css">
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-    href="../../../_static/vendor/fontawesome/5.13.0/webfonts/fa-brands-400.woff2">
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+    <link rel="stylesheet"
+      href="../../../_static/vendor/fontawesome/5.13.0/css/all.min.css">
+    <link rel="preload" as="font" type="font/woff2" crossorigin
+      href="../../../_static/vendor/fontawesome/5.13.0/webfonts/fa-solid-900.woff2">
+    <link rel="preload" as="font" type="font/woff2" crossorigin
+      href="../../../_static/vendor/fontawesome/5.13.0/webfonts/fa-brands-400.woff2">
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+    <link rel="stylesheet" href="../../../_static/styles/pydata-sphinx-theme.css" type="text/css" />
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     <script src="../../../_static/jquery.js"></script>
     <script src="../../../_static/underscore.js"></script>
@@ -37,7 +38,10 @@
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     <link rel="prev" title="Start a Ballista Cluster" href="index.html" />
     <meta name="viewport" content="width=device-width, initial-scale=1" />
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   </head>
   <body data-spy="scroll" data-target="#bd-toc-nav" data-offset="80">
@@ -53,6 +57,7 @@
             
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+              <div class="sidebar-start-items">
 <a class="navbar-brand" href="../../../index.html">
   <img src="../../../_static/images/DataFusion-Logo-Background-White.png" class="logo" alt="logo">
 </a>
@@ -65,7 +70,7 @@
 <nav class="bd-links" id="bd-docs-nav" aria-label="Main navigation">
   <div class="bd-toc-item active">
     
-    <p class="caption">
+    <p>
  <span class="caption-text">
   Supported Environments
  </span>
@@ -174,7 +179,7 @@
   </a>
  </li>
 </ul>
-<p class="caption">
+<p>
  <span class="caption-text">
   User Guide
  </span>
@@ -210,6 +215,11 @@
    </i>
   </label>
   <ul>
+   <li class="toctree-l2">
+    <a class="reference internal" href="../../sql/sql_status.html">
+     Status
+    </a>
+   </li>
    <li class="toctree-l2">
     <a class="reference internal" href="../../sql/select.html">
      SELECT syntax
@@ -314,12 +324,17 @@
   </a>
  </li>
 </ul>
-<p class="caption">
+<p>
  <span class="caption-text">
   Specification
  </span>
 </p>
 <ul class="nav bd-sidenav">
+ <li class="toctree-l1">
+  <a class="reference internal" href="../../../specification/roadmap.html">
+   Roadmap
+  </a>
+ </li>
  <li class="toctree-l1">
   <a class="reference internal" href="../../../specification/invariants.html">
    DataFusion’s Invariants
@@ -330,8 +345,13 @@
    Datafusion output field name semantic
   </a>
  </li>
+ <li class="toctree-l1">
+  <a class="reference internal" href="../../../specification/quarterly_roadmap.html">
+   Roadmap
+  </a>
+ </li>
 </ul>
-<p class="caption">
+<p>
  <span class="caption-text">
   README
  </span>
@@ -348,7 +368,7 @@
   </a>
  </li>
 </ul>
-<p class="caption">
+<p>
  <span class="caption-text">
   Community
  </span>
@@ -364,11 +384,19 @@
    Issue tracker
   </a>
  </li>
+ <li class="toctree-l1">
+  <a class="reference external" href="https://github.com/apache/arrow-datafusion/blob/master/CODE_OF_CONDUCT.md">
+   Code of conduct
+  </a>
+ </li>
 </ul>
 
     
   </div>
 </nav>
+              </div>
+              <div class="sidebar-end-items">
+              </div>
             </div>
             
           
@@ -426,7 +454,7 @@
   specific language governing permissions and limitations
   under the License.
 -->
-<div class="section" id="deploying-a-standalone-ballista-cluster-using-cargo-install">
+<section id="deploying-a-standalone-ballista-cluster-using-cargo-install">
 <h1>Deploying a standalone Ballista cluster using cargo install<a class="headerlink" href="#deploying-a-standalone-ballista-cluster-using-cargo-install" title="Permalink to this headline">¶</a></h1>
 <p>A simple way to start a local cluster for testing purposes is to use cargo to install
 the scheduler and executor crates.</p>
@@ -449,18 +477,29 @@ <h1>Deploying a standalone Ballista cluster using cargo install<a class="headerl
 <div class="highlight-bash notranslate"><div class="highlight"><pre><span></span><span class="nv">RUST_LOG</span><span class="o">=</span>info ballista-executor --bind-port <span class="m">50052</span> -c <span class="m">4</span>
 </pre></div>
 </div>
-</div>
+</section>
 
 
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-    <a class='right-next' id="next-link" href="docker.html" title="next page">Starting a Ballista cluster using Docker</a>
-
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+              <!-- Previous / next buttons -->
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+            <p class="prev-next-subtitle">previous</p>
+            <p class="prev-next-title">Start a Ballista Cluster</p>
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+    <div class="prev-next-info">
+        <p class="prev-next-subtitle">next</p>
+        <p class="prev-next-title">Starting a Ballista cluster using Docker</p>
+    </div>
+    <i class="fas fa-angle-right"></i>
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+</div>
               
           </main>
           
@@ -468,20 +507,19 @@ <h1>Deploying a standalone Ballista cluster using cargo install<a class="headerl
       </div>
     </div>
   
-  <script src="../../../_static/js/index.1c5a1a01449ed65a7b51.js"></script>
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   <footer class="footer mt-5 mt-md-0">
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+    &copy; Copyright 2021, Apache Software Foundation.<br>
 </p>
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       <p class="sphinx-version">
-Created using <a href="http://sphinx-doc.org/">Sphinx</a> 2.4.4.<br/>
+Created using <a href="http://sphinx-doc.org/">Sphinx</a> 2.4.4.<br>
 </p>
     </div>
     
diff --git a/datafusion/user-guide/distributed/deployment/configuration.html b/datafusion/user-guide/distributed/deployment/configuration.html
index 1a0a5340737a..a43fc32e8fb5 100644
--- a/datafusion/user-guide/distributed/deployment/configuration.html
+++ b/datafusion/user-guide/distributed/deployment/configuration.html
@@ -3,30 +3,31 @@
 
 <html xmlns="http://www.w3.org/1999/xhtml">
   <head>
-    <meta charset="utf-8" />
+    <meta charset="utf-8" /><meta name="generator" content="Docutils 0.17.1: http://docutils.sourceforge.net/" />
+
     <title>Configuration &#8212; Arrow Datafusion  documentation</title>
     
-  <link href="../../../_static/css/theme.css" rel="stylesheet" />
-  <link href="../../../_static/css/index.c5995385ac14fb8791e8eb36b4908be2.css" rel="stylesheet" />
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+    <link href="../../../_static/styles/theme.css?digest=1999514e3f237ded88cf" rel="stylesheet">
+<link href="../../../_static/styles/pydata-sphinx-theme.css?digest=1999514e3f237ded88cf" rel="stylesheet">
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-    href="../../../_static/vendor/fontawesome/5.13.0/css/all.min.css">
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-    href="../../../_static/vendor/fontawesome/5.13.0/webfonts/fa-brands-400.woff2">
-
+    <link rel="stylesheet"
+      href="../../../_static/vendor/fontawesome/5.13.0/css/all.min.css">
+    <link rel="preload" as="font" type="font/woff2" crossorigin
+      href="../../../_static/vendor/fontawesome/5.13.0/webfonts/fa-solid-900.woff2">
+    <link rel="preload" as="font" type="font/woff2" crossorigin
+      href="../../../_static/vendor/fontawesome/5.13.0/webfonts/fa-brands-400.woff2">
+  
     
       
-
+  
     
-    <link rel="stylesheet" href="../../../_static/basic.css" type="text/css" />
+    <link rel="stylesheet" href="../../../_static/styles/pydata-sphinx-theme.css" type="text/css" />
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+    <link rel="preload" as="script" href="../../../_static/scripts/pydata-sphinx-theme.js?digest=1999514e3f237ded88cf">
+  
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     <script src="../../../_static/jquery.js"></script>
     <script src="../../../_static/underscore.js"></script>
@@ -37,7 +38,10 @@
     <link rel="next" title="Clients" href="../clients/index.html" />
     <link rel="prev" title="Running Ballista on Raspberry Pi" href="raspberrypi.html" />
     <meta name="viewport" content="width=device-width, initial-scale=1" />
-    <meta name="docsearch:language" content="en" />
+    <meta name="docsearch:language" content="None">
+    
+
+    <!-- Google Analytics -->
     
   </head>
   <body data-spy="scroll" data-target="#bd-toc-nav" data-offset="80">
@@ -53,6 +57,7 @@
             
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             <div class="col-12 col-md-3 bd-sidebar">
+              <div class="sidebar-start-items">
 <a class="navbar-brand" href="../../../index.html">
   <img src="../../../_static/images/DataFusion-Logo-Background-White.png" class="logo" alt="logo">
 </a>
@@ -65,7 +70,7 @@
 <nav class="bd-links" id="bd-docs-nav" aria-label="Main navigation">
   <div class="bd-toc-item active">
     
-    <p class="caption">
+    <p>
  <span class="caption-text">
   Supported Environments
  </span>
@@ -174,7 +179,7 @@
   </a>
  </li>
 </ul>
-<p class="caption">
+<p>
  <span class="caption-text">
   User Guide
  </span>
@@ -210,6 +215,11 @@
    </i>
   </label>
   <ul>
+   <li class="toctree-l2">
+    <a class="reference internal" href="../../sql/sql_status.html">
+     Status
+    </a>
+   </li>
    <li class="toctree-l2">
     <a class="reference internal" href="../../sql/select.html">
      SELECT syntax
@@ -314,12 +324,17 @@
   </a>
  </li>
 </ul>
-<p class="caption">
+<p>
  <span class="caption-text">
   Specification
  </span>
 </p>
 <ul class="nav bd-sidenav">
+ <li class="toctree-l1">
+  <a class="reference internal" href="../../../specification/roadmap.html">
+   Roadmap
+  </a>
+ </li>
  <li class="toctree-l1">
   <a class="reference internal" href="../../../specification/invariants.html">
    DataFusion’s Invariants
@@ -330,8 +345,13 @@
    Datafusion output field name semantic
   </a>
  </li>
+ <li class="toctree-l1">
+  <a class="reference internal" href="../../../specification/quarterly_roadmap.html">
+   Roadmap
+  </a>
+ </li>
 </ul>
-<p class="caption">
+<p>
  <span class="caption-text">
   README
  </span>
@@ -348,7 +368,7 @@
   </a>
  </li>
 </ul>
-<p class="caption">
+<p>
  <span class="caption-text">
   Community
  </span>
@@ -364,11 +384,19 @@
    Issue tracker
   </a>
  </li>
+ <li class="toctree-l1">
+  <a class="reference external" href="https://github.com/apache/arrow-datafusion/blob/master/CODE_OF_CONDUCT.md">
+   Code of conduct
+  </a>
+ </li>
 </ul>
 
     
   </div>
 </nav>
+              </div>
+              <div class="sidebar-end-items">
+              </div>
             </div>
             
           
@@ -426,7 +454,7 @@
   specific language governing permissions and limitations
   under the License.
 -->
-<div class="section" id="configuration">
+<section id="configuration">
 <h1>Configuration<a class="headerlink" href="#configuration" title="Permalink to this headline">¶</a></h1>
 <p>The rust executor and scheduler can be configured using toml files, environment variables and command line arguments. The specification for config options can be found in <code class="docutils literal notranslate"><span class="pre">rust/ballista/src/bin/[executor|scheduler]_config_spec.toml</span></code>.</p>
 <p>Those files fully define Ballista’s configuration. If there is a discrepancy between this documentation and the files, assume those files are correct.</p>
@@ -435,18 +463,29 @@ <h1>Configuration<a class="headerlink" href="#configuration" title="Permalink to
 <p>The order of precedence for arguments is: default config file &lt; environment variables &lt; specified config file &lt; command line arguments.</p>
 <p>The executor and scheduler will look for the default config file at <code class="docutils literal notranslate"><span class="pre">/etc/ballista/[executor|scheduler].toml</span></code> To specify a config file use the <code class="docutils literal notranslate"><span class="pre">--config-file</span></code> argument.</p>
 <p>Environment variables are prefixed by <code class="docutils literal notranslate"><span class="pre">BALLISTA_EXECUTOR</span></code> or <code class="docutils literal notranslate"><span class="pre">BALLISTA_SCHEDULER</span></code> for the executor and scheduler respectively. Hyphens in command line arguments become underscores. For example, the <code class="docutils literal notranslate"><span class="pre">--scheduler-host</span></code> argument for the executor becomes <code class="docutils literal notranslate"><span class="pre">BALLISTA_EXECUTOR_SCHEDULER_HOST</span></code></p>
-</div>
+</section>
 
 
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+              <!-- Previous / next buttons -->
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@@ -454,20 +493,19 @@ <h1>Configuration<a class="headerlink" href="#configuration" title="Permalink to
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     <div class="footer-item">
       <p class="sphinx-version">
-Created using <a href="http://sphinx-doc.org/">Sphinx</a> 2.4.4.<br/>
+Created using <a href="http://sphinx-doc.org/">Sphinx</a> 2.4.4.<br>
 </p>
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diff --git a/datafusion/user-guide/distributed/deployment/docker-compose.html b/datafusion/user-guide/distributed/deployment/docker-compose.html
index 125754e03621..ca611b7d0769 100644
--- a/datafusion/user-guide/distributed/deployment/docker-compose.html
+++ b/datafusion/user-guide/distributed/deployment/docker-compose.html
@@ -3,30 +3,31 @@
 
 <html xmlns="http://www.w3.org/1999/xhtml">
   <head>
-    <meta charset="utf-8" />
+    <meta charset="utf-8" /><meta name="generator" content="Docutils 0.17.1: http://docutils.sourceforge.net/" />
+
     <title>Starting a Ballista cluster using Docker Compose &#8212; Arrow Datafusion  documentation</title>
     
-  <link href="../../../_static/css/theme.css" rel="stylesheet" />
-  <link href="../../../_static/css/index.c5995385ac14fb8791e8eb36b4908be2.css" rel="stylesheet" />
-
+    <link href="../../../_static/styles/theme.css?digest=1999514e3f237ded88cf" rel="stylesheet">
+<link href="../../../_static/styles/pydata-sphinx-theme.css?digest=1999514e3f237ded88cf" rel="stylesheet">
+  
     
-  <link rel="stylesheet"
-    href="../../../_static/vendor/fontawesome/5.13.0/css/all.min.css">
-  <link rel="preload" as="font" type="font/woff2" crossorigin
-    href="../../../_static/vendor/fontawesome/5.13.0/webfonts/fa-solid-900.woff2">
-  <link rel="preload" as="font" type="font/woff2" crossorigin
-    href="../../../_static/vendor/fontawesome/5.13.0/webfonts/fa-brands-400.woff2">
-
+    <link rel="stylesheet"
+      href="../../../_static/vendor/fontawesome/5.13.0/css/all.min.css">
+    <link rel="preload" as="font" type="font/woff2" crossorigin
+      href="../../../_static/vendor/fontawesome/5.13.0/webfonts/fa-solid-900.woff2">
+    <link rel="preload" as="font" type="font/woff2" crossorigin
+      href="../../../_static/vendor/fontawesome/5.13.0/webfonts/fa-brands-400.woff2">
+  
     
       
-
+  
     
-    <link rel="stylesheet" href="../../../_static/basic.css" type="text/css" />
+    <link rel="stylesheet" href="../../../_static/styles/pydata-sphinx-theme.css" type="text/css" />
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     <link rel="stylesheet" type="text/css" href="../../../_static/theme_overrides.css" />
     
-  <link rel="preload" as="script" href="../../../_static/js/index.1c5a1a01449ed65a7b51.js">
-
+    <link rel="preload" as="script" href="../../../_static/scripts/pydata-sphinx-theme.js?digest=1999514e3f237ded88cf">
+  
     <script id="documentation_options" data-url_root="../../../" src="../../../_static/documentation_options.js"></script>
     <script src="../../../_static/jquery.js"></script>
     <script src="../../../_static/underscore.js"></script>
@@ -37,7 +38,10 @@
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     <link rel="prev" title="Starting a Ballista cluster using Docker" href="docker.html" />
     <meta name="viewport" content="width=device-width, initial-scale=1" />
-    <meta name="docsearch:language" content="en" />
+    <meta name="docsearch:language" content="None">
+    
+
+    <!-- Google Analytics -->
     
   </head>
   <body data-spy="scroll" data-target="#bd-toc-nav" data-offset="80">
@@ -53,6 +57,7 @@
             
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             <div class="col-12 col-md-3 bd-sidebar">
+              <div class="sidebar-start-items">
 <a class="navbar-brand" href="../../../index.html">
   <img src="../../../_static/images/DataFusion-Logo-Background-White.png" class="logo" alt="logo">
 </a>
@@ -65,7 +70,7 @@
 <nav class="bd-links" id="bd-docs-nav" aria-label="Main navigation">
   <div class="bd-toc-item active">
     
-    <p class="caption">
+    <p>
  <span class="caption-text">
   Supported Environments
  </span>
@@ -174,7 +179,7 @@
   </a>
  </li>
 </ul>
-<p class="caption">
+<p>
  <span class="caption-text">
   User Guide
  </span>
@@ -210,6 +215,11 @@
    </i>
   </label>
   <ul>
+   <li class="toctree-l2">
+    <a class="reference internal" href="../../sql/sql_status.html">
+     Status
+    </a>
+   </li>
    <li class="toctree-l2">
     <a class="reference internal" href="../../sql/select.html">
      SELECT syntax
@@ -314,7 +324,7 @@
   </a>
  </li>
 </ul>
-<p class="caption">
+<p>
  <span class="caption-text">
   Specification
  </span>
@@ -335,8 +345,13 @@
    Datafusion output field name semantic
   </a>
  </li>
+ <li class="toctree-l1">
+  <a class="reference internal" href="../../../specification/quarterly_roadmap.html">
+   Roadmap
+  </a>
+ </li>
 </ul>
-<p class="caption">
+<p>
  <span class="caption-text">
   README
  </span>
@@ -353,7 +368,7 @@
   </a>
  </li>
 </ul>
-<p class="caption">
+<p>
  <span class="caption-text">
   Community
  </span>
@@ -379,6 +394,9 @@
     
   </div>
 </nav>
+              </div>
+              <div class="sidebar-end-items">
+              </div>
             </div>
             
           
@@ -451,10 +469,10 @@
   specific language governing permissions and limitations
   under the License.
 -->
-<div class="section" id="starting-a-ballista-cluster-using-docker-compose">
+<section id="starting-a-ballista-cluster-using-docker-compose">
 <h1>Starting a Ballista cluster using Docker Compose<a class="headerlink" href="#starting-a-ballista-cluster-using-docker-compose" title="Permalink to this headline">¶</a></h1>
 <p>Docker Compose is a convenient way to launch a cluster when testing locally.</p>
-<div class="section" id="build-docker-image">
+<section id="build-docker-image">
 <h2>Build Docker image<a class="headerlink" href="#build-docker-image" title="Permalink to this headline">¶</a></h2>
 <p>There is no officially published Docker image so it is currently necessary to build the image from source instead.</p>
 <p>Run the following commands to clone the source repository and build the Docker image.</p>
@@ -464,8 +482,8 @@ <h2>Build Docker image<a class="headerlink" href="#build-docker-image" title="Pe
 </pre></div>
 </div>
 <p>This will create an image with the tag <code class="docutils literal notranslate"><span class="pre">ballista:0.6.0</span></code>.</p>
-</div>
-<div class="section" id="start-a-cluster">
+</section>
+<section id="start-a-cluster">
 <h2>Start a cluster<a class="headerlink" href="#start-a-cluster" title="Permalink to this headline">¶</a></h2>
 <p>The following Docker Compose example demonstrates how to start a cluster using one scheduler process and one
 executor process, with the scheduler using etcd as a backing store. A data volume is mounted into each container
@@ -519,19 +537,30 @@ <h2>Start a cluster<a class="headerlink" href="#start-a-cluster" title="Permalin
 </pre></div>
 </div>
 <p>The scheduler listens on port 50050 and this is the port that clients will need to connect to.</p>
-</div>
-</div>
+</section>
+</section>
 
 
               </div>
               
               
-              <div class='prev-next-bottom'>
-                
-    <a class='left-prev' id="prev-link" href="docker.html" title="previous page">Starting a Ballista cluster using Docker</a>
-    <a class='right-next' id="next-link" href="kubernetes.html" title="next page">Deploying Ballista with Kubernetes</a>
-
-              </div>
+              <!-- Previous / next buttons -->
+<div class='prev-next-area'>
+    <a class='left-prev' id="prev-link" href="docker.html" title="previous page">
+        <i class="fas fa-angle-left"></i>
+        <div class="prev-next-info">
+            <p class="prev-next-subtitle">previous</p>
+            <p class="prev-next-title">Starting a Ballista cluster using Docker</p>
+        </div>
+    </a>
+    <a class='right-next' id="next-link" href="kubernetes.html" title="next page">
+    <div class="prev-next-info">
+        <p class="prev-next-subtitle">next</p>
+        <p class="prev-next-title">Deploying Ballista with Kubernetes</p>
+    </div>
+    <i class="fas fa-angle-right"></i>
+    </a>
+</div>
               
           </main>
           
@@ -539,20 +568,19 @@ <h2>Start a cluster<a class="headerlink" href="#start-a-cluster" title="Permalin
       </div>
     </div>
   
-  <script src="../../../_static/js/index.1c5a1a01449ed65a7b51.js"></script>
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+    <script src="../../../_static/scripts/pydata-sphinx-theme.js?digest=1999514e3f237ded88cf"></script>
   <footer class="footer mt-5 mt-md-0">
   <div class="container">
     
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       <p class="copyright">
-    &copy; Copyright 2021, Apache Software Foundation.<br/>
+    &copy; Copyright 2021, Apache Software Foundation.<br>
 </p>
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     <div class="footer-item">
       <p class="sphinx-version">
-Created using <a href="http://sphinx-doc.org/">Sphinx</a> 2.4.4.<br/>
+Created using <a href="http://sphinx-doc.org/">Sphinx</a> 2.4.4.<br>
 </p>
     </div>
     
diff --git a/datafusion/user-guide/distributed/deployment/docker.html b/datafusion/user-guide/distributed/deployment/docker.html
index 7e7c52df07e9..cde2ab04abe9 100644
--- a/datafusion/user-guide/distributed/deployment/docker.html
+++ b/datafusion/user-guide/distributed/deployment/docker.html
@@ -3,30 +3,31 @@
 
 <html xmlns="http://www.w3.org/1999/xhtml">
   <head>
-    <meta charset="utf-8" />
+    <meta charset="utf-8" /><meta name="generator" content="Docutils 0.17.1: http://docutils.sourceforge.net/" />
+
     <title>Starting a Ballista cluster using Docker &#8212; Arrow Datafusion  documentation</title>
     
-  <link href="../../../_static/css/theme.css" rel="stylesheet" />
-  <link href="../../../_static/css/index.c5995385ac14fb8791e8eb36b4908be2.css" rel="stylesheet" />
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+    <link href="../../../_static/styles/theme.css?digest=1999514e3f237ded88cf" rel="stylesheet">
+<link href="../../../_static/styles/pydata-sphinx-theme.css?digest=1999514e3f237ded88cf" rel="stylesheet">
+  
     
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-    href="../../../_static/vendor/fontawesome/5.13.0/css/all.min.css">
-  <link rel="preload" as="font" type="font/woff2" crossorigin
-    href="../../../_static/vendor/fontawesome/5.13.0/webfonts/fa-solid-900.woff2">
-  <link rel="preload" as="font" type="font/woff2" crossorigin
-    href="../../../_static/vendor/fontawesome/5.13.0/webfonts/fa-brands-400.woff2">
-
+    <link rel="stylesheet"
+      href="../../../_static/vendor/fontawesome/5.13.0/css/all.min.css">
+    <link rel="preload" as="font" type="font/woff2" crossorigin
+      href="../../../_static/vendor/fontawesome/5.13.0/webfonts/fa-solid-900.woff2">
+    <link rel="preload" as="font" type="font/woff2" crossorigin
+      href="../../../_static/vendor/fontawesome/5.13.0/webfonts/fa-brands-400.woff2">
+  
     
       
-
+  
     
-    <link rel="stylesheet" href="../../../_static/basic.css" type="text/css" />
+    <link rel="stylesheet" href="../../../_static/styles/pydata-sphinx-theme.css" type="text/css" />
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-  <link rel="preload" as="script" href="../../../_static/js/index.1c5a1a01449ed65a7b51.js">
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+    <link rel="preload" as="script" href="../../../_static/scripts/pydata-sphinx-theme.js?digest=1999514e3f237ded88cf">
+  
     <script id="documentation_options" data-url_root="../../../" src="../../../_static/documentation_options.js"></script>
     <script src="../../../_static/jquery.js"></script>
     <script src="../../../_static/underscore.js"></script>
@@ -37,7 +38,10 @@
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     <link rel="prev" title="Deploying a standalone Ballista cluster using cargo install" href="cargo-install.html" />
     <meta name="viewport" content="width=device-width, initial-scale=1" />
-    <meta name="docsearch:language" content="en" />
+    <meta name="docsearch:language" content="None">
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+    <!-- Google Analytics -->
     
   </head>
   <body data-spy="scroll" data-target="#bd-toc-nav" data-offset="80">
@@ -53,6 +57,7 @@
             
             <!-- Only show if we have sidebars configured, else just a small margin  -->
             <div class="col-12 col-md-3 bd-sidebar">
+              <div class="sidebar-start-items">
 <a class="navbar-brand" href="../../../index.html">
   <img src="../../../_static/images/DataFusion-Logo-Background-White.png" class="logo" alt="logo">
 </a>
@@ -65,7 +70,7 @@
 <nav class="bd-links" id="bd-docs-nav" aria-label="Main navigation">
   <div class="bd-toc-item active">
     
-    <p class="caption">
+    <p>
  <span class="caption-text">
   Supported Environments
  </span>
@@ -174,7 +179,7 @@
   </a>
  </li>
 </ul>
-<p class="caption">
+<p>
  <span class="caption-text">
   User Guide
  </span>
@@ -210,6 +215,11 @@
    </i>
   </label>
   <ul>
+   <li class="toctree-l2">
+    <a class="reference internal" href="../../sql/sql_status.html">
+     Status
+    </a>
+   </li>
    <li class="toctree-l2">
     <a class="reference internal" href="../../sql/select.html">
      SELECT syntax
@@ -314,12 +324,17 @@
   </a>
  </li>
 </ul>
-<p class="caption">
+<p>
  <span class="caption-text">
   Specification
  </span>
 </p>
 <ul class="nav bd-sidenav">
+ <li class="toctree-l1">
+  <a class="reference internal" href="../../../specification/roadmap.html">
+   Roadmap
+  </a>
+ </li>
  <li class="toctree-l1">
   <a class="reference internal" href="../../../specification/invariants.html">
    DataFusion’s Invariants
@@ -330,8 +345,13 @@
    Datafusion output field name semantic
   </a>
  </li>
+ <li class="toctree-l1">
+  <a class="reference internal" href="../../../specification/quarterly_roadmap.html">
+   Roadmap
+  </a>
+ </li>
 </ul>
-<p class="caption">
+<p>
  <span class="caption-text">
   README
  </span>
@@ -348,7 +368,7 @@
   </a>
  </li>
 </ul>
-<p class="caption">
+<p>
  <span class="caption-text">
   Community
  </span>
@@ -364,11 +384,19 @@
    Issue tracker
   </a>
  </li>
+ <li class="toctree-l1">
+  <a class="reference external" href="https://github.com/apache/arrow-datafusion/blob/master/CODE_OF_CONDUCT.md">
+   Code of conduct
+  </a>
+ </li>
 </ul>
 
     
   </div>
 </nav>
+              </div>
+              <div class="sidebar-end-items">
+              </div>
             </div>
             
           
@@ -453,9 +481,9 @@
   specific language governing permissions and limitations
   under the License.
 -->
-<div class="section" id="starting-a-ballista-cluster-using-docker">
+<section id="starting-a-ballista-cluster-using-docker">
 <h1>Starting a Ballista cluster using Docker<a class="headerlink" href="#starting-a-ballista-cluster-using-docker" title="Permalink to this headline">¶</a></h1>
-<div class="section" id="build-docker-image">
+<section id="build-docker-image">
 <h2>Build Docker image<a class="headerlink" href="#build-docker-image" title="Permalink to this headline">¶</a></h2>
 <p>There is no officially published Docker image so it is currently necessary to build the image from source instead.</p>
 <p>Run the following commands to clone the source repository and build the Docker image.</p>
@@ -465,7 +493,7 @@ <h2>Build Docker image<a class="headerlink" href="#build-docker-image" title="Pe
 </pre></div>
 </div>
 <p>This will create an image with the tag <code class="docutils literal notranslate"><span class="pre">ballista:0.6.0</span></code>.</p>
-<div class="section" id="start-a-scheduler">
+<section id="start-a-scheduler">
 <h3>Start a Scheduler<a class="headerlink" href="#start-a-scheduler" title="Permalink to this headline">¶</a></h3>
 <p>Start a scheduler using the following syntax:</p>
 <div class="highlight-bash notranslate"><div class="highlight"><pre><span></span>docker run --network<span class="o">=</span>host <span class="se">\</span>
@@ -484,8 +512,8 @@ <h3>Start a Scheduler<a class="headerlink" href="#start-a-scheduler" title="Perm
 [2021-08-28T15:45:11Z INFO  ballista_scheduler] Ballista v0.6.0 Scheduler listening on 0.0.0.0:50050
 </pre></div>
 </div>
-</div>
-<div class="section" id="start-executors">
+</section>
+<section id="start-executors">
 <h3>Start executors<a class="headerlink" href="#start-executors" title="Permalink to this headline">¶</a></h3>
 <p>Start one or more executor processes. Each executor process will need to listen on a different port.</p>
 <div class="highlight-bash notranslate"><div class="highlight"><pre><span></span>docker run --network<span class="o">=</span>host <span class="se">\</span>
@@ -508,8 +536,8 @@ <h3>Start executors<a class="headerlink" href="#start-executors" title="Permalin
 [2021-08-28T15:45:58Z INFO  ballista_executor] Ballista v0.6.0 Rust Executor listening on 0.0.0.0:50051
 </pre></div>
 </div>
-</div>
-<div class="section" id="using-etcd-as-backing-store">
+</section>
+<section id="using-etcd-as-backing-store">
 <h3>Using etcd as backing store<a class="headerlink" href="#using-etcd-as-backing-store" title="Permalink to this headline">¶</a></h3>
 <p><em>NOTE: This functionality is currently experimental</em></p>
 <p>Ballista can optionally use <a class="reference external" href="https://etcd.io/">etcd</a> as a backing store for the scheduler. Use the following commands
@@ -523,20 +551,31 @@ <h3>Using etcd as backing store<a class="headerlink" href="#using-etcd-as-backin
 </div>
 <p>Please refer to the <a class="reference external" href="https://etcd.io/">etcd</a> web site for installation instructions. Etcd version 3.4.9 or later is
 recommended.</p>
-</div>
-</div>
-</div>
+</section>
+</section>
+</section>
 
 
               </div>
               
               
-              <div class='prev-next-bottom'>
-                
-    <a class='left-prev' id="prev-link" href="cargo-install.html" title="previous page">Deploying a standalone Ballista cluster using cargo install</a>
-    <a class='right-next' id="next-link" href="docker-compose.html" title="next page">Starting a Ballista cluster using Docker Compose</a>
-
-              </div>
+              <!-- Previous / next buttons -->
+<div class='prev-next-area'>
+    <a class='left-prev' id="prev-link" href="cargo-install.html" title="previous page">
+        <i class="fas fa-angle-left"></i>
+        <div class="prev-next-info">
+            <p class="prev-next-subtitle">previous</p>
+            <p class="prev-next-title">Deploying a standalone Ballista cluster using cargo install</p>
+        </div>
+    </a>
+    <a class='right-next' id="next-link" href="docker-compose.html" title="next page">
+    <div class="prev-next-info">
+        <p class="prev-next-subtitle">next</p>
+        <p class="prev-next-title">Starting a Ballista cluster using Docker Compose</p>
+    </div>
+    <i class="fas fa-angle-right"></i>
+    </a>
+</div>
               
           </main>
           
@@ -544,20 +583,19 @@ <h3>Using etcd as backing store<a class="headerlink" href="#using-etcd-as-backin
       </div>
     </div>
   
-  <script src="../../../_static/js/index.1c5a1a01449ed65a7b51.js"></script>
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   <footer class="footer mt-5 mt-md-0">
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       <p class="copyright">
-    &copy; Copyright 2021, Apache Software Foundation.<br/>
+    &copy; Copyright 2021, Apache Software Foundation.<br>
 </p>
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     <div class="footer-item">
       <p class="sphinx-version">
-Created using <a href="http://sphinx-doc.org/">Sphinx</a> 2.4.4.<br/>
+Created using <a href="http://sphinx-doc.org/">Sphinx</a> 2.4.4.<br>
 </p>
     </div>
     
diff --git a/datafusion/user-guide/distributed/deployment/index.html b/datafusion/user-guide/distributed/deployment/index.html
index 4b17652f58f2..2ba2df01a5f0 100644
--- a/datafusion/user-guide/distributed/deployment/index.html
+++ b/datafusion/user-guide/distributed/deployment/index.html
@@ -3,30 +3,31 @@
 
 <html xmlns="http://www.w3.org/1999/xhtml">
   <head>
-    <meta charset="utf-8" />
+    <meta charset="utf-8" /><meta name="generator" content="Docutils 0.17.1: http://docutils.sourceforge.net/" />
+
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-    href="../../../_static/vendor/fontawesome/5.13.0/webfonts/fa-brands-400.woff2">
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+      href="../../../_static/vendor/fontawesome/5.13.0/css/all.min.css">
+    <link rel="preload" as="font" type="font/woff2" crossorigin
+      href="../../../_static/vendor/fontawesome/5.13.0/webfonts/fa-solid-900.woff2">
+    <link rel="preload" as="font" type="font/woff2" crossorigin
+      href="../../../_static/vendor/fontawesome/5.13.0/webfonts/fa-brands-400.woff2">
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-  <link rel="preload" as="script" href="../../../_static/js/index.1c5a1a01449ed65a7b51.js">
-
+    <link rel="preload" as="script" href="../../../_static/scripts/pydata-sphinx-theme.js?digest=1999514e3f237ded88cf">
+  
     <script id="documentation_options" data-url_root="../../../" src="../../../_static/documentation_options.js"></script>
     <script src="../../../_static/jquery.js"></script>
     <script src="../../../_static/underscore.js"></script>
@@ -37,7 +38,10 @@
     <link rel="next" title="Deploying a standalone Ballista cluster using cargo install" href="cargo-install.html" />
     <link rel="prev" title="Overview" href="../introduction.html" />
     <meta name="viewport" content="width=device-width, initial-scale=1" />
-    <meta name="docsearch:language" content="en" />
+    <meta name="docsearch:language" content="None">
+    
+
+    <!-- Google Analytics -->
     
   </head>
   <body data-spy="scroll" data-target="#bd-toc-nav" data-offset="80">
@@ -53,6 +57,7 @@
             
             <!-- Only show if we have sidebars configured, else just a small margin  -->
             <div class="col-12 col-md-3 bd-sidebar">
+              <div class="sidebar-start-items">
 <a class="navbar-brand" href="../../../index.html">
   <img src="../../../_static/images/DataFusion-Logo-Background-White.png" class="logo" alt="logo">
 </a>
@@ -65,7 +70,7 @@
 <nav class="bd-links" id="bd-docs-nav" aria-label="Main navigation">
   <div class="bd-toc-item active">
     
-    <p class="caption">
+    <p>
  <span class="caption-text">
   Supported Environments
  </span>
@@ -174,7 +179,7 @@
   </a>
  </li>
 </ul>
-<p class="caption">
+<p>
  <span class="caption-text">
   User Guide
  </span>
@@ -210,6 +215,11 @@
    </i>
   </label>
   <ul>
+   <li class="toctree-l2">
+    <a class="reference internal" href="../../sql/sql_status.html">
+     Status
+    </a>
+   </li>
    <li class="toctree-l2">
     <a class="reference internal" href="../../sql/select.html">
      SELECT syntax
@@ -314,7 +324,7 @@
   </a>
  </li>
 </ul>
-<p class="caption">
+<p>
  <span class="caption-text">
   Specification
  </span>
@@ -335,8 +345,13 @@
    Datafusion output field name semantic
   </a>
  </li>
+ <li class="toctree-l1">
+  <a class="reference internal" href="../../../specification/quarterly_roadmap.html">
+   Roadmap
+  </a>
+ </li>
 </ul>
-<p class="caption">
+<p>
  <span class="caption-text">
   README
  </span>
@@ -353,7 +368,7 @@
   </a>
  </li>
 </ul>
-<p class="caption">
+<p>
  <span class="caption-text">
   Community
  </span>
@@ -379,6 +394,9 @@
     
   </div>
 </nav>
+              </div>
+              <div class="sidebar-end-items">
+              </div>
             </div>
             
           
@@ -418,7 +436,7 @@
               
               <div>
                 
-  <div class="section" id="start-a-ballista-cluster">
+  <section id="start-a-ballista-cluster">
 <h1>Start a Ballista Cluster<a class="headerlink" href="#start-a-ballista-cluster" title="Permalink to this headline">¶</a></h1>
 <div class="toctree-wrapper compound">
 <ul>
@@ -455,18 +473,29 @@ <h1>Start a Ballista Cluster<a class="headerlink" href="#start-a-ballista-cluste
 <li class="toctree-l1"><a class="reference internal" href="configuration.html">Configuration</a></li>
 </ul>
 </div>
-</div>
+</section>
 
 
               </div>
               
               
-              <div class='prev-next-bottom'>
-                
-    <a class='left-prev' id="prev-link" href="../introduction.html" title="previous page">Overview</a>
-    <a class='right-next' id="next-link" href="cargo-install.html" title="next page">Deploying a standalone Ballista cluster using cargo install</a>
-
-              </div>
+              <!-- Previous / next buttons -->
+<div class='prev-next-area'>
+    <a class='left-prev' id="prev-link" href="../introduction.html" title="previous page">
+        <i class="fas fa-angle-left"></i>
+        <div class="prev-next-info">
+            <p class="prev-next-subtitle">previous</p>
+            <p class="prev-next-title">Overview</p>
+        </div>
+    </a>
+    <a class='right-next' id="next-link" href="cargo-install.html" title="next page">
+    <div class="prev-next-info">
+        <p class="prev-next-subtitle">next</p>
+        <p class="prev-next-title">Deploying a standalone Ballista cluster using cargo install</p>
+    </div>
+    <i class="fas fa-angle-right"></i>
+    </a>
+</div>
               
           </main>
           
@@ -474,20 +503,19 @@ <h1>Start a Ballista Cluster<a class="headerlink" href="#start-a-ballista-cluste
       </div>
     </div>
   
-  <script src="../../../_static/js/index.1c5a1a01449ed65a7b51.js"></script>
-
+    <script src="../../../_static/scripts/pydata-sphinx-theme.js?digest=1999514e3f237ded88cf"></script>
   <footer class="footer mt-5 mt-md-0">
   <div class="container">
     
     <div class="footer-item">
       <p class="copyright">
-    &copy; Copyright 2021, Apache Software Foundation.<br/>
+    &copy; Copyright 2021, Apache Software Foundation.<br>
 </p>
     </div>
     
     <div class="footer-item">
       <p class="sphinx-version">
-Created using <a href="http://sphinx-doc.org/">Sphinx</a> 2.4.4.<br/>
+Created using <a href="http://sphinx-doc.org/">Sphinx</a> 2.4.4.<br>
 </p>
     </div>
     
diff --git a/datafusion/user-guide/distributed/deployment/kubernetes.html b/datafusion/user-guide/distributed/deployment/kubernetes.html
index 5b71bae5a0c7..a963079b009f 100644
--- a/datafusion/user-guide/distributed/deployment/kubernetes.html
+++ b/datafusion/user-guide/distributed/deployment/kubernetes.html
@@ -3,30 +3,31 @@
 
 <html xmlns="http://www.w3.org/1999/xhtml">
   <head>
-    <meta charset="utf-8" />
+    <meta charset="utf-8" /><meta name="generator" content="Docutils 0.17.1: http://docutils.sourceforge.net/" />
+
     <title>Deploying Ballista with Kubernetes &#8212; Arrow Datafusion  documentation</title>
     
-  <link href="../../../_static/css/theme.css" rel="stylesheet" />
-  <link href="../../../_static/css/index.c5995385ac14fb8791e8eb36b4908be2.css" rel="stylesheet" />
-
+    <link href="../../../_static/styles/theme.css?digest=1999514e3f237ded88cf" rel="stylesheet">
+<link href="../../../_static/styles/pydata-sphinx-theme.css?digest=1999514e3f237ded88cf" rel="stylesheet">
+  
     
-  <link rel="stylesheet"
-    href="../../../_static/vendor/fontawesome/5.13.0/css/all.min.css">
-  <link rel="preload" as="font" type="font/woff2" crossorigin
-    href="../../../_static/vendor/fontawesome/5.13.0/webfonts/fa-solid-900.woff2">
-  <link rel="preload" as="font" type="font/woff2" crossorigin
-    href="../../../_static/vendor/fontawesome/5.13.0/webfonts/fa-brands-400.woff2">
-
+    <link rel="stylesheet"
+      href="../../../_static/vendor/fontawesome/5.13.0/css/all.min.css">
+    <link rel="preload" as="font" type="font/woff2" crossorigin
+      href="../../../_static/vendor/fontawesome/5.13.0/webfonts/fa-solid-900.woff2">
+    <link rel="preload" as="font" type="font/woff2" crossorigin
+      href="../../../_static/vendor/fontawesome/5.13.0/webfonts/fa-brands-400.woff2">
+  
     
       
-
+  
     
-    <link rel="stylesheet" href="../../../_static/basic.css" type="text/css" />
+    <link rel="stylesheet" href="../../../_static/styles/pydata-sphinx-theme.css" type="text/css" />
     <link rel="stylesheet" href="../../../_static/pygments.css" type="text/css" />
     <link rel="stylesheet" type="text/css" href="../../../_static/theme_overrides.css" />
     
-  <link rel="preload" as="script" href="../../../_static/js/index.1c5a1a01449ed65a7b51.js">
-
+    <link rel="preload" as="script" href="../../../_static/scripts/pydata-sphinx-theme.js?digest=1999514e3f237ded88cf">
+  
     <script id="documentation_options" data-url_root="../../../" src="../../../_static/documentation_options.js"></script>
     <script src="../../../_static/jquery.js"></script>
     <script src="../../../_static/underscore.js"></script>
@@ -37,7 +38,10 @@
     <link rel="next" title="Running Ballista on Raspberry Pi" href="raspberrypi.html" />
     <link rel="prev" title="Starting a Ballista cluster using Docker Compose" href="docker-compose.html" />
     <meta name="viewport" content="width=device-width, initial-scale=1" />
-    <meta name="docsearch:language" content="en" />
+    <meta name="docsearch:language" content="None">
+    
+
+    <!-- Google Analytics -->
     
   </head>
   <body data-spy="scroll" data-target="#bd-toc-nav" data-offset="80">
@@ -53,6 +57,7 @@
             
             <!-- Only show if we have sidebars configured, else just a small margin  -->
             <div class="col-12 col-md-3 bd-sidebar">
+              <div class="sidebar-start-items">
 <a class="navbar-brand" href="../../../index.html">
   <img src="../../../_static/images/DataFusion-Logo-Background-White.png" class="logo" alt="logo">
 </a>
@@ -65,7 +70,7 @@
 <nav class="bd-links" id="bd-docs-nav" aria-label="Main navigation">
   <div class="bd-toc-item active">
     
-    <p class="caption">
+    <p>
  <span class="caption-text">
   Supported Environments
  </span>
@@ -174,7 +179,7 @@
   </a>
  </li>
 </ul>
-<p class="caption">
+<p>
  <span class="caption-text">
   User Guide
  </span>
@@ -210,6 +215,11 @@
    </i>
   </label>
   <ul>
+   <li class="toctree-l2">
+    <a class="reference internal" href="../../sql/sql_status.html">
+     Status
+    </a>
+   </li>
    <li class="toctree-l2">
     <a class="reference internal" href="../../sql/select.html">
      SELECT syntax
@@ -314,12 +324,17 @@
   </a>
  </li>
 </ul>
-<p class="caption">
+<p>
  <span class="caption-text">
   Specification
  </span>
 </p>
 <ul class="nav bd-sidenav">
+ <li class="toctree-l1">
+  <a class="reference internal" href="../../../specification/roadmap.html">
+   Roadmap
+  </a>
+ </li>
  <li class="toctree-l1">
   <a class="reference internal" href="../../../specification/invariants.html">
    DataFusion’s Invariants
@@ -330,8 +345,13 @@
    Datafusion output field name semantic
   </a>
  </li>
+ <li class="toctree-l1">
+  <a class="reference internal" href="../../../specification/quarterly_roadmap.html">
+   Roadmap
+  </a>
+ </li>
 </ul>
-<p class="caption">
+<p>
  <span class="caption-text">
   README
  </span>
@@ -348,7 +368,7 @@
   </a>
  </li>
 </ul>
-<p class="caption">
+<p>
  <span class="caption-text">
   Community
  </span>
@@ -364,11 +384,19 @@
    Issue tracker
   </a>
  </li>
+ <li class="toctree-l1">
+  <a class="reference external" href="https://github.com/apache/arrow-datafusion/blob/master/CODE_OF_CONDUCT.md">
+   Code of conduct
+  </a>
+ </li>
 </ul>
 
     
   </div>
 </nav>
+              </div>
+              <div class="sidebar-end-items">
+              </div>
             </div>
             
           
@@ -476,7 +504,7 @@
   specific language governing permissions and limitations
   under the License.
 -->
-<div class="section" id="deploying-ballista-with-kubernetes">
+<section id="deploying-ballista-with-kubernetes">
 <h1>Deploying Ballista with Kubernetes<a class="headerlink" href="#deploying-ballista-with-kubernetes" title="Permalink to this headline">¶</a></h1>
 <p>Ballista can be deployed to any Kubernetes cluster using the following instructions. These instructions assume that
 you are already comfortable managing Kubernetes deployments.</p>
@@ -488,15 +516,15 @@ <h1>Deploying Ballista with Kubernetes<a class="headerlink" href="#deploying-bal
 <li><p>k8s persistent volume and persistent volume claims to make local data accessible to Ballista</p></li>
 <li><p><em>(optional)</em> a <a class="reference external" href="http://keda.sh">keda</a> instance for autoscaling the number of executors</p></li>
 </ul>
-<div class="section" id="testing-locally">
+<section id="testing-locally">
 <h2>Testing locally<a class="headerlink" href="#testing-locally" title="Permalink to this headline">¶</a></h2>
 <p><a class="reference external" href="https://microk8s.io/">Microk8s</a> is recommended for installing a local k8s cluster. Once Microk8s is installed, DNS
 must be enabled using the following command.</p>
 <div class="highlight-bash notranslate"><div class="highlight"><pre><span></span>microk8s <span class="nb">enable</span> dns
 </pre></div>
 </div>
-</div>
-<div class="section" id="limitations">
+</section>
+<section id="limitations">
 <h2>Limitations<a class="headerlink" href="#limitations" title="Permalink to this headline">¶</a></h2>
 <p>Ballista is at an early stage of development and therefore has some significant limitations:</p>
 <ul class="simple">
@@ -505,8 +533,8 @@ <h2>Limitations<a class="headerlink" href="#limitations" title="Permalink to thi
 <li><p>Only a single scheduler instance is currently supported unless the scheduler is configured to use <code class="docutils literal notranslate"><span class="pre">etcd</span></code> as a
 backing store.</p></li>
 </ul>
-</div>
-<div class="section" id="build-docker-image">
+</section>
+<section id="build-docker-image">
 <h2>Build Docker image<a class="headerlink" href="#build-docker-image" title="Permalink to this headline">¶</a></h2>
 <p>There is no officially published Docker image so it is currently necessary to build the image from source instead.</p>
 <p>Run the following commands to clone the source repository and build the Docker image.</p>
@@ -516,16 +544,16 @@ <h2>Build Docker image<a class="headerlink" href="#build-docker-image" title="Pe
 </pre></div>
 </div>
 <p>This will create an image with the tag <code class="docutils literal notranslate"><span class="pre">ballista:0.6.0</span></code>.</p>
-</div>
-<div class="section" id="publishing-your-images">
+</section>
+<section id="publishing-your-images">
 <h2>Publishing your images<a class="headerlink" href="#publishing-your-images" title="Permalink to this headline">¶</a></h2>
 <p>Once the images have been built, you can retag them and can push them to your favourite docker registry.</p>
 <div class="highlight-bash notranslate"><div class="highlight"><pre><span></span>docker tag ballista:0.6.0 &lt;your-repo&gt;/ballista:0.6.0
 docker push &lt;your-repo&gt;/ballista:0.6.0
 </pre></div>
 </div>
-</div>
-<div class="section" id="create-persistent-volume-and-persistent-volume-claim">
+</section>
+<section id="create-persistent-volume-and-persistent-volume-claim">
 <h2>Create Persistent Volume and Persistent Volume Claim<a class="headerlink" href="#create-persistent-volume-and-persistent-volume-claim" title="Permalink to this headline">¶</a></h2>
 <p>Copy the following yaml to a <code class="docutils literal notranslate"><span class="pre">pv.yaml</span></code> file and apply to the cluster to create a persistent volume and a persistent
 volume claim so that the specified host directory is available to the containers. This is where any data should be
@@ -567,8 +595,8 @@ <h2>Create Persistent Volume and Persistent Volume Claim<a class="headerlink" hr
 persistentvolumeclaim/data-pv-claim created
 </pre></div>
 </div>
-</div>
-<div class="section" id="deploying-ballista-scheduler-and-executors">
+</section>
+<section id="deploying-ballista-scheduler-and-executors">
 <h2>Deploying Ballista Scheduler and Executors<a class="headerlink" href="#deploying-ballista-scheduler-and-executors" title="Permalink to this headline">¶</a></h2>
 <p>Copy the following yaml to a <code class="docutils literal notranslate"><span class="pre">cluster.yaml</span></code> file and change <code class="docutils literal notranslate"><span class="pre">&lt;your-image&gt;</span></code> with the name of your Ballista Docker image.</p>
 <div class="highlight-yaml notranslate"><div class="highlight"><pre><span></span><span class="nt">apiVersion</span><span class="p">:</span> <span class="l l-Scalar l-Scalar-Plain">v1</span>
@@ -674,8 +702,8 @@ <h2>Deploying Ballista Scheduler and Executors<a class="headerlink" href="#deplo
 [2021-02-19T00:24:17Z INFO  ballista::scheduler] Received register_executor request for ExecutorMetadata { id: &quot;816e4502-a876-4ed8-b33f-86d243dcf63f&quot;, host: &quot;10.1.23.150&quot;, port: 50051 }
 </pre></div>
 </div>
-</div>
-<div class="section" id="port-forwarding">
+</section>
+<section id="port-forwarding">
 <h2>Port Forwarding<a class="headerlink" href="#port-forwarding" title="Permalink to this headline">¶</a></h2>
 <p>If you want to run applications outside of the cluster and have them connect to the scheduler then it is necessary to
 set up port forwarding.</p>
@@ -690,15 +718,15 @@ <h2>Port Forwarding<a class="headerlink" href="#port-forwarding" title="Permalin
 <div class="highlight-bash notranslate"><div class="highlight"><pre><span></span>kubectl port-forward service/ballista-scheduler <span class="m">50050</span>:50050
 </pre></div>
 </div>
-</div>
-<div class="section" id="deleting-the-ballista-cluster">
+</section>
+<section id="deleting-the-ballista-cluster">
 <h2>Deleting the Ballista cluster<a class="headerlink" href="#deleting-the-ballista-cluster" title="Permalink to this headline">¶</a></h2>
 <p>Run the following kubectl command to delete the cluster.</p>
 <div class="highlight-bash notranslate"><div class="highlight"><pre><span></span>kubectl delete -f cluster.yaml
 </pre></div>
 </div>
-</div>
-<div class="section" id="adding-autoscaling-for-executors">
+</section>
+<section id="adding-autoscaling-for-executors">
 <h2>Adding autoscaling for executors<a class="headerlink" href="#adding-autoscaling-for-executors" title="Permalink to this headline">¶</a></h2>
 <p>Ballista supports autoscaling for executors through <a class="reference external" href="http://keda.sh">Keda</a>. Keda allows scaling a deployment
 through custom metrics which are exposed through the Ballista scheduler, and it can even scale the number of
@@ -734,19 +762,30 @@ <h2>Adding autoscaling for executors<a class="headerlink" href="#adding-autoscal
 you launch a query. Please note that Keda will perform a scan once every 30 seconds, so it might take a bit to
 scale the executors.</p>
 <p>Please visit Keda’s <a class="reference external" href="https://keda.sh/docs/2.3/concepts/scaling-deployments/">documentation page</a> for more information.</p>
-</div>
-</div>
+</section>
+</section>
 
 
               </div>
               
               
-              <div class='prev-next-bottom'>
-                
-    <a class='left-prev' id="prev-link" href="docker-compose.html" title="previous page">Starting a Ballista cluster using Docker Compose</a>
-    <a class='right-next' id="next-link" href="raspberrypi.html" title="next page">Running Ballista on Raspberry Pi</a>
-
-              </div>
+              <!-- Previous / next buttons -->
+<div class='prev-next-area'>
+    <a class='left-prev' id="prev-link" href="docker-compose.html" title="previous page">
+        <i class="fas fa-angle-left"></i>
+        <div class="prev-next-info">
+            <p class="prev-next-subtitle">previous</p>
+            <p class="prev-next-title">Starting a Ballista cluster using Docker Compose</p>
+        </div>
+    </a>
+    <a class='right-next' id="next-link" href="raspberrypi.html" title="next page">
+    <div class="prev-next-info">
+        <p class="prev-next-subtitle">next</p>
+        <p class="prev-next-title">Running Ballista on Raspberry Pi</p>
+    </div>
+    <i class="fas fa-angle-right"></i>
+    </a>
+</div>
               
           </main>
           
@@ -754,20 +793,19 @@ <h2>Adding autoscaling for executors<a class="headerlink" href="#adding-autoscal
       </div>
     </div>
   
-  <script src="../../../_static/js/index.1c5a1a01449ed65a7b51.js"></script>
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+    <script src="../../../_static/scripts/pydata-sphinx-theme.js?digest=1999514e3f237ded88cf"></script>
   <footer class="footer mt-5 mt-md-0">
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       <p class="copyright">
-    &copy; Copyright 2021, Apache Software Foundation.<br/>
+    &copy; Copyright 2021, Apache Software Foundation.<br>
 </p>
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       <p class="sphinx-version">
-Created using <a href="http://sphinx-doc.org/">Sphinx</a> 2.4.4.<br/>
+Created using <a href="http://sphinx-doc.org/">Sphinx</a> 2.4.4.<br>
 </p>
     </div>
     
diff --git a/datafusion/user-guide/distributed/deployment/raspberrypi.html b/datafusion/user-guide/distributed/deployment/raspberrypi.html
index f5c269e1e6fa..2efe727ca61b 100644
--- a/datafusion/user-guide/distributed/deployment/raspberrypi.html
+++ b/datafusion/user-guide/distributed/deployment/raspberrypi.html
@@ -3,30 +3,31 @@
 
 <html xmlns="http://www.w3.org/1999/xhtml">
   <head>
-    <meta charset="utf-8" />
+    <meta charset="utf-8" /><meta name="generator" content="Docutils 0.17.1: http://docutils.sourceforge.net/" />
+
     <title>Running Ballista on Raspberry Pi &#8212; Arrow Datafusion  documentation</title>
     
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-  <link href="../../../_static/css/index.c5995385ac14fb8791e8eb36b4908be2.css" rel="stylesheet" />
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+    <link href="../../../_static/styles/theme.css?digest=1999514e3f237ded88cf" rel="stylesheet">
+<link href="../../../_static/styles/pydata-sphinx-theme.css?digest=1999514e3f237ded88cf" rel="stylesheet">
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-    href="../../../_static/vendor/fontawesome/5.13.0/css/all.min.css">
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-    href="../../../_static/vendor/fontawesome/5.13.0/webfonts/fa-brands-400.woff2">
-
+    <link rel="stylesheet"
+      href="../../../_static/vendor/fontawesome/5.13.0/css/all.min.css">
+    <link rel="preload" as="font" type="font/woff2" crossorigin
+      href="../../../_static/vendor/fontawesome/5.13.0/webfonts/fa-solid-900.woff2">
+    <link rel="preload" as="font" type="font/woff2" crossorigin
+      href="../../../_static/vendor/fontawesome/5.13.0/webfonts/fa-brands-400.woff2">
+  
     
       
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-  <link rel="preload" as="script" href="../../../_static/js/index.1c5a1a01449ed65a7b51.js">
-
+    <link rel="preload" as="script" href="../../../_static/scripts/pydata-sphinx-theme.js?digest=1999514e3f237ded88cf">
+  
     <script id="documentation_options" data-url_root="../../../" src="../../../_static/documentation_options.js"></script>
     <script src="../../../_static/jquery.js"></script>
     <script src="../../../_static/underscore.js"></script>
@@ -37,7 +38,10 @@
     <link rel="next" title="Configuration" href="configuration.html" />
     <link rel="prev" title="Deploying Ballista with Kubernetes" href="kubernetes.html" />
     <meta name="viewport" content="width=device-width, initial-scale=1" />
-    <meta name="docsearch:language" content="en" />
+    <meta name="docsearch:language" content="None">
+    
+
+    <!-- Google Analytics -->
     
   </head>
   <body data-spy="scroll" data-target="#bd-toc-nav" data-offset="80">
@@ -53,6 +57,7 @@
             
             <!-- Only show if we have sidebars configured, else just a small margin  -->
             <div class="col-12 col-md-3 bd-sidebar">
+              <div class="sidebar-start-items">
 <a class="navbar-brand" href="../../../index.html">
   <img src="../../../_static/images/DataFusion-Logo-Background-White.png" class="logo" alt="logo">
 </a>
@@ -65,7 +70,7 @@
 <nav class="bd-links" id="bd-docs-nav" aria-label="Main navigation">
   <div class="bd-toc-item active">
     
-    <p class="caption">
+    <p>
  <span class="caption-text">
   Supported Environments
  </span>
@@ -174,7 +179,7 @@
   </a>
  </li>
 </ul>
-<p class="caption">
+<p>
  <span class="caption-text">
   User Guide
  </span>
@@ -210,6 +215,11 @@
    </i>
   </label>
   <ul>
+   <li class="toctree-l2">
+    <a class="reference internal" href="../../sql/sql_status.html">
+     Status
+    </a>
+   </li>
    <li class="toctree-l2">
     <a class="reference internal" href="../../sql/select.html">
      SELECT syntax
@@ -314,12 +324,17 @@
   </a>
  </li>
 </ul>
-<p class="caption">
+<p>
  <span class="caption-text">
   Specification
  </span>
 </p>
 <ul class="nav bd-sidenav">
+ <li class="toctree-l1">
+  <a class="reference internal" href="../../../specification/roadmap.html">
+   Roadmap
+  </a>
+ </li>
  <li class="toctree-l1">
   <a class="reference internal" href="../../../specification/invariants.html">
    DataFusion’s Invariants
@@ -330,8 +345,13 @@
    Datafusion output field name semantic
   </a>
  </li>
+ <li class="toctree-l1">
+  <a class="reference internal" href="../../../specification/quarterly_roadmap.html">
+   Roadmap
+  </a>
+ </li>
 </ul>
-<p class="caption">
+<p>
  <span class="caption-text">
   README
  </span>
@@ -348,7 +368,7 @@
   </a>
  </li>
 </ul>
-<p class="caption">
+<p>
  <span class="caption-text">
   Community
  </span>
@@ -364,11 +384,19 @@
    Issue tracker
   </a>
  </li>
+ <li class="toctree-l1">
+  <a class="reference external" href="https://github.com/apache/arrow-datafusion/blob/master/CODE_OF_CONDUCT.md">
+   Code of conduct
+  </a>
+ </li>
 </ul>
 
     
   </div>
 </nav>
+              </div>
+              <div class="sidebar-end-items">
+              </div>
             </div>
             
           
@@ -456,19 +484,19 @@
   specific language governing permissions and limitations
   under the License.
 -->
-<div class="section" id="running-ballista-on-raspberry-pi">
+<section id="running-ballista-on-raspberry-pi">
 <h1>Running Ballista on Raspberry Pi<a class="headerlink" href="#running-ballista-on-raspberry-pi" title="Permalink to this headline">¶</a></h1>
 <p>The Raspberry Pi single-board computer provides a fun and relatively inexpensive way to get started with distributed
 computing.</p>
 <p>These instructions have been tested using an Ubuntu Linux desktop as the host, and a
 <a class="reference external" href="https://www.raspberrypi.org/products/raspberry-pi-4-model-b/">Raspberry Pi 4 Model B</a> with 4 GB RAM as the target.</p>
-<div class="section" id="preparing-the-raspberry-pi">
+<section id="preparing-the-raspberry-pi">
 <h2>Preparing the Raspberry Pi<a class="headerlink" href="#preparing-the-raspberry-pi" title="Permalink to this headline">¶</a></h2>
 <p>We recommend installing the 64-bit version of <a class="reference external" href="https://ubuntu.com/raspberry-pi">Ubuntu for Raspberry Pi</a>.</p>
 <p>The Rust implementation of Arrow does not work correctly on 32-bit ARM architectures
 (<a class="reference external" href="https://github.com/apache/arrow-rs/issues/109">issue</a>).</p>
-</div>
-<div class="section" id="cross-compiling-datafusion-for-the-raspberry-pi">
+</section>
+<section id="cross-compiling-datafusion-for-the-raspberry-pi">
 <h2>Cross Compiling DataFusion for the Raspberry Pi<a class="headerlink" href="#cross-compiling-datafusion-for-the-raspberry-pi" title="Permalink to this headline">¶</a></h2>
 <p>We do not yet publish official Docker images as part of the release process, although we do plan to do this in the
 future (<a class="reference external" href="https://github.com/apache/arrow-datafusion/issues/228">issue #228</a>).</p>
@@ -489,8 +517,8 @@ <h2>Cross Compiling DataFusion for the Raspberry Pi<a class="headerlink" href="#
 <div class="highlight-bash notranslate"><div class="highlight"><pre><span></span>cross <span class="nb">test</span> --target aarch64-unknown-linux-gnu
 </pre></div>
 </div>
-</div>
-<div class="section" id="deploying-the-binaries-to-raspberry-pi">
+</section>
+<section id="deploying-the-binaries-to-raspberry-pi">
 <h2>Deploying the binaries to Raspberry Pi<a class="headerlink" href="#deploying-the-binaries-to-raspberry-pi" title="Permalink to this headline">¶</a></h2>
 <p>You should now be able to copy the executable to the Raspberry Pi using scp on Linux. You will need to change the IP
 address in these commands to be the IP address for your Raspberry Pi. The easiest way to find this is to connect a
@@ -505,8 +533,8 @@ <h2>Deploying the binaries to Raspberry Pi<a class="headerlink" href="#deploying
 </pre></div>
 </div>
 <p>It is now possible to run the Ballista scheduler and executor natively on the Pi.</p>
-</div>
-<div class="section" id="docker">
+</section>
+<section id="docker">
 <h2>Docker<a class="headerlink" href="#docker" title="Permalink to this headline">¶</a></h2>
 <p>Using Docker’s <code class="docutils literal notranslate"><span class="pre">buildx</span></code> cross-platform functionality, we can also build a docker image targeting ARM64
 from any desktop environment. This will require write access to a Docker repository
@@ -535,25 +563,36 @@ <h2>Docker<a class="headerlink" href="#docker" title="Permalink to this headline
 </div>
 <p>Note that it will be necessary to mount appropriate volumes into the containers and also configure networking
 so that the Docker containers can communicate with each other. This can be achieved using Docker compose or Kubernetes.</p>
-</div>
-<div class="section" id="kubernetes">
+</section>
+<section id="kubernetes">
 <h2>Kubernetes<a class="headerlink" href="#kubernetes" title="Permalink to this headline">¶</a></h2>
 <p>With Docker images built using the instructions above, it is now possible to deploy Ballista to a Kubernetes cluster
 running on one of more Raspberry Pi computers. Refer to the instructions in the <a class="reference internal" href="kubernetes.html"><span class="doc std std-doc">Kubernetes</span></a> chapter
 for more information, and remember to change the Docker image name to <code class="docutils literal notranslate"><span class="pre">myrepo/ballista-arm64</span></code>.</p>
-</div>
-</div>
+</section>
+</section>
 
 
               </div>
               
               
-              <div class='prev-next-bottom'>
-                
-    <a class='left-prev' id="prev-link" href="kubernetes.html" title="previous page">Deploying Ballista with Kubernetes</a>
-    <a class='right-next' id="next-link" href="configuration.html" title="next page">Configuration</a>
-
-              </div>
+              <!-- Previous / next buttons -->
+<div class='prev-next-area'>
+    <a class='left-prev' id="prev-link" href="kubernetes.html" title="previous page">
+        <i class="fas fa-angle-left"></i>
+        <div class="prev-next-info">
+            <p class="prev-next-subtitle">previous</p>
+            <p class="prev-next-title">Deploying Ballista with Kubernetes</p>
+        </div>
+    </a>
+    <a class='right-next' id="next-link" href="configuration.html" title="next page">
+    <div class="prev-next-info">
+        <p class="prev-next-subtitle">next</p>
+        <p class="prev-next-title">Configuration</p>
+    </div>
+    <i class="fas fa-angle-right"></i>
+    </a>
+</div>
               
           </main>
           
@@ -561,20 +600,19 @@ <h2>Kubernetes<a class="headerlink" href="#kubernetes" title="Permalink to this
       </div>
     </div>
   
-  <script src="../../../_static/js/index.1c5a1a01449ed65a7b51.js"></script>
-
+    <script src="../../../_static/scripts/pydata-sphinx-theme.js?digest=1999514e3f237ded88cf"></script>
   <footer class="footer mt-5 mt-md-0">
   <div class="container">
     
     <div class="footer-item">
       <p class="copyright">
-    &copy; Copyright 2021, Apache Software Foundation.<br/>
+    &copy; Copyright 2021, Apache Software Foundation.<br>
 </p>
     </div>
     
     <div class="footer-item">
       <p class="sphinx-version">
-Created using <a href="http://sphinx-doc.org/">Sphinx</a> 2.4.4.<br/>
+Created using <a href="http://sphinx-doc.org/">Sphinx</a> 2.4.4.<br>
 </p>
     </div>
     
diff --git a/datafusion/user-guide/distributed/index.html b/datafusion/user-guide/distributed/index.html
index e076e3ea2535..7b938336b07e 100644
--- a/datafusion/user-guide/distributed/index.html
+++ b/datafusion/user-guide/distributed/index.html
@@ -3,30 +3,31 @@
 
 <html xmlns="http://www.w3.org/1999/xhtml">
   <head>
-    <meta charset="utf-8" />
+    <meta charset="utf-8" /><meta name="generator" content="Docutils 0.17.1: http://docutils.sourceforge.net/" />
+
     <title>Ballista Distributed Compute &#8212; Arrow Datafusion  documentation</title>
     
-  <link href="../../_static/css/theme.css" rel="stylesheet" />
-  <link href="../../_static/css/index.c5995385ac14fb8791e8eb36b4908be2.css" rel="stylesheet" />
-
+    <link href="../../_static/styles/theme.css?digest=1999514e3f237ded88cf" rel="stylesheet">
+<link href="../../_static/styles/pydata-sphinx-theme.css?digest=1999514e3f237ded88cf" rel="stylesheet">
+  
     
-  <link rel="stylesheet"
-    href="../../_static/vendor/fontawesome/5.13.0/css/all.min.css">
-  <link rel="preload" as="font" type="font/woff2" crossorigin
-    href="../../_static/vendor/fontawesome/5.13.0/webfonts/fa-solid-900.woff2">
-  <link rel="preload" as="font" type="font/woff2" crossorigin
-    href="../../_static/vendor/fontawesome/5.13.0/webfonts/fa-brands-400.woff2">
-
+    <link rel="stylesheet"
+      href="../../_static/vendor/fontawesome/5.13.0/css/all.min.css">
+    <link rel="preload" as="font" type="font/woff2" crossorigin
+      href="../../_static/vendor/fontawesome/5.13.0/webfonts/fa-solid-900.woff2">
+    <link rel="preload" as="font" type="font/woff2" crossorigin
+      href="../../_static/vendor/fontawesome/5.13.0/webfonts/fa-brands-400.woff2">
+  
     
       
-
+  
     
-    <link rel="stylesheet" href="../../_static/basic.css" type="text/css" />
+    <link rel="stylesheet" href="../../_static/styles/pydata-sphinx-theme.css" type="text/css" />
     <link rel="stylesheet" href="../../_static/pygments.css" type="text/css" />
     <link rel="stylesheet" type="text/css" href="../../_static/theme_overrides.css" />
     
-  <link rel="preload" as="script" href="../../_static/js/index.1c5a1a01449ed65a7b51.js">
-
+    <link rel="preload" as="script" href="../../_static/scripts/pydata-sphinx-theme.js?digest=1999514e3f237ded88cf">
+  
     <script id="documentation_options" data-url_root="../../" src="../../_static/documentation_options.js"></script>
     <script src="../../_static/jquery.js"></script>
     <script src="../../_static/underscore.js"></script>
@@ -37,7 +38,10 @@
     <link rel="next" title="Overview" href="introduction.html" />
     <link rel="prev" title="Datafusion-Specific Functions" href="../sql/datafusion-functions.html" />
     <meta name="viewport" content="width=device-width, initial-scale=1" />
-    <meta name="docsearch:language" content="en" />
+    <meta name="docsearch:language" content="None">
+    
+
+    <!-- Google Analytics -->
     
   </head>
   <body data-spy="scroll" data-target="#bd-toc-nav" data-offset="80">
@@ -53,6 +57,7 @@
             
             <!-- Only show if we have sidebars configured, else just a small margin  -->
             <div class="col-12 col-md-3 bd-sidebar">
+              <div class="sidebar-start-items">
 <a class="navbar-brand" href="../../index.html">
   <img src="../../_static/images/DataFusion-Logo-Background-White.png" class="logo" alt="logo">
 </a>
@@ -65,7 +70,7 @@
 <nav class="bd-links" id="bd-docs-nav" aria-label="Main navigation">
   <div class="bd-toc-item active">
     
-    <p class="caption">
+    <p>
  <span class="caption-text">
   Supported Environments
  </span>
@@ -174,7 +179,7 @@
   </a>
  </li>
 </ul>
-<p class="caption">
+<p>
  <span class="caption-text">
   User Guide
  </span>
@@ -210,6 +215,11 @@
    </i>
   </label>
   <ul>
+   <li class="toctree-l2">
+    <a class="reference internal" href="../sql/sql_status.html">
+     Status
+    </a>
+   </li>
    <li class="toctree-l2">
     <a class="reference internal" href="../sql/select.html">
      SELECT syntax
@@ -314,12 +324,17 @@
   </a>
  </li>
 </ul>
-<p class="caption">
+<p>
  <span class="caption-text">
   Specification
  </span>
 </p>
 <ul class="nav bd-sidenav">
+ <li class="toctree-l1">
+  <a class="reference internal" href="../../specification/roadmap.html">
+   Roadmap
+  </a>
+ </li>
  <li class="toctree-l1">
   <a class="reference internal" href="../../specification/invariants.html">
    DataFusion’s Invariants
@@ -330,8 +345,13 @@
    Datafusion output field name semantic
   </a>
  </li>
+ <li class="toctree-l1">
+  <a class="reference internal" href="../../specification/quarterly_roadmap.html">
+   Roadmap
+  </a>
+ </li>
 </ul>
-<p class="caption">
+<p>
  <span class="caption-text">
   README
  </span>
@@ -348,7 +368,7 @@
   </a>
  </li>
 </ul>
-<p class="caption">
+<p>
  <span class="caption-text">
   Community
  </span>
@@ -364,11 +384,19 @@
    Issue tracker
   </a>
  </li>
+ <li class="toctree-l1">
+  <a class="reference external" href="https://github.com/apache/arrow-datafusion/blob/master/CODE_OF_CONDUCT.md">
+   Code of conduct
+  </a>
+ </li>
 </ul>
 
     
   </div>
 </nav>
+              </div>
+              <div class="sidebar-end-items">
+              </div>
             </div>
             
           
@@ -408,7 +436,7 @@
               
               <div>
                 
-  <div class="section" id="ballista-distributed-compute">
+  <section id="ballista-distributed-compute">
 <h1>Ballista Distributed Compute<a class="headerlink" href="#ballista-distributed-compute" title="Permalink to this headline">¶</a></h1>
 <div class="toctree-wrapper compound">
 <ul>
@@ -433,18 +461,29 @@ <h1>Ballista Distributed Compute<a class="headerlink" href="#ballista-distribute
 </li>
 </ul>
 </div>
-</div>
+</section>
 
 
               </div>
               
               
-              <div class='prev-next-bottom'>
-                
-    <a class='left-prev' id="prev-link" href="../sql/datafusion-functions.html" title="previous page">Datafusion-Specific Functions</a>
-    <a class='right-next' id="next-link" href="introduction.html" title="next page">Overview</a>
-
-              </div>
+              <!-- Previous / next buttons -->
+<div class='prev-next-area'>
+    <a class='left-prev' id="prev-link" href="../sql/datafusion-functions.html" title="previous page">
+        <i class="fas fa-angle-left"></i>
+        <div class="prev-next-info">
+            <p class="prev-next-subtitle">previous</p>
+            <p class="prev-next-title">Datafusion-Specific Functions</p>
+        </div>
+    </a>
+    <a class='right-next' id="next-link" href="introduction.html" title="next page">
+    <div class="prev-next-info">
+        <p class="prev-next-subtitle">next</p>
+        <p class="prev-next-title">Overview</p>
+    </div>
+    <i class="fas fa-angle-right"></i>
+    </a>
+</div>
               
           </main>
           
@@ -452,20 +491,19 @@ <h1>Ballista Distributed Compute<a class="headerlink" href="#ballista-distribute
       </div>
     </div>
   
-  <script src="../../_static/js/index.1c5a1a01449ed65a7b51.js"></script>
-
+    <script src="../../_static/scripts/pydata-sphinx-theme.js?digest=1999514e3f237ded88cf"></script>
   <footer class="footer mt-5 mt-md-0">
   <div class="container">
     
     <div class="footer-item">
       <p class="copyright">
-    &copy; Copyright 2021, Apache Software Foundation.<br/>
+    &copy; Copyright 2021, Apache Software Foundation.<br>
 </p>
     </div>
     
     <div class="footer-item">
       <p class="sphinx-version">
-Created using <a href="http://sphinx-doc.org/">Sphinx</a> 2.4.4.<br/>
+Created using <a href="http://sphinx-doc.org/">Sphinx</a> 2.4.4.<br>
 </p>
     </div>
     
diff --git a/datafusion/user-guide/distributed/introduction.html b/datafusion/user-guide/distributed/introduction.html
index 4a4455bbb889..48fbcc45547a 100644
--- a/datafusion/user-guide/distributed/introduction.html
+++ b/datafusion/user-guide/distributed/introduction.html
@@ -3,30 +3,31 @@
 
 <html xmlns="http://www.w3.org/1999/xhtml">
   <head>
-    <meta charset="utf-8" />
+    <meta charset="utf-8" /><meta name="generator" content="Docutils 0.17.1: http://docutils.sourceforge.net/" />
+
     <title>Overview &#8212; Arrow Datafusion  documentation</title>
     
-  <link href="../../_static/css/theme.css" rel="stylesheet" />
-  <link href="../../_static/css/index.c5995385ac14fb8791e8eb36b4908be2.css" rel="stylesheet" />
-
+    <link href="../../_static/styles/theme.css?digest=1999514e3f237ded88cf" rel="stylesheet">
+<link href="../../_static/styles/pydata-sphinx-theme.css?digest=1999514e3f237ded88cf" rel="stylesheet">
+  
     
-  <link rel="stylesheet"
-    href="../../_static/vendor/fontawesome/5.13.0/css/all.min.css">
-  <link rel="preload" as="font" type="font/woff2" crossorigin
-    href="../../_static/vendor/fontawesome/5.13.0/webfonts/fa-solid-900.woff2">
-  <link rel="preload" as="font" type="font/woff2" crossorigin
-    href="../../_static/vendor/fontawesome/5.13.0/webfonts/fa-brands-400.woff2">
-
+    <link rel="stylesheet"
+      href="../../_static/vendor/fontawesome/5.13.0/css/all.min.css">
+    <link rel="preload" as="font" type="font/woff2" crossorigin
+      href="../../_static/vendor/fontawesome/5.13.0/webfonts/fa-solid-900.woff2">
+    <link rel="preload" as="font" type="font/woff2" crossorigin
+      href="../../_static/vendor/fontawesome/5.13.0/webfonts/fa-brands-400.woff2">
+  
     
       
-
+  
     
-    <link rel="stylesheet" href="../../_static/basic.css" type="text/css" />
+    <link rel="stylesheet" href="../../_static/styles/pydata-sphinx-theme.css" type="text/css" />
     <link rel="stylesheet" href="../../_static/pygments.css" type="text/css" />
     <link rel="stylesheet" type="text/css" href="../../_static/theme_overrides.css" />
     
-  <link rel="preload" as="script" href="../../_static/js/index.1c5a1a01449ed65a7b51.js">
-
+    <link rel="preload" as="script" href="../../_static/scripts/pydata-sphinx-theme.js?digest=1999514e3f237ded88cf">
+  
     <script id="documentation_options" data-url_root="../../" src="../../_static/documentation_options.js"></script>
     <script src="../../_static/jquery.js"></script>
     <script src="../../_static/underscore.js"></script>
@@ -37,7 +38,10 @@
     <link rel="next" title="Start a Ballista Cluster" href="deployment/index.html" />
     <link rel="prev" title="Ballista Distributed Compute" href="index.html" />
     <meta name="viewport" content="width=device-width, initial-scale=1" />
-    <meta name="docsearch:language" content="en" />
+    <meta name="docsearch:language" content="None">
+    
+
+    <!-- Google Analytics -->
     
   </head>
   <body data-spy="scroll" data-target="#bd-toc-nav" data-offset="80">
@@ -53,6 +57,7 @@
             
             <!-- Only show if we have sidebars configured, else just a small margin  -->
             <div class="col-12 col-md-3 bd-sidebar">
+              <div class="sidebar-start-items">
 <a class="navbar-brand" href="../../index.html">
   <img src="../../_static/images/DataFusion-Logo-Background-White.png" class="logo" alt="logo">
 </a>
@@ -65,7 +70,7 @@
 <nav class="bd-links" id="bd-docs-nav" aria-label="Main navigation">
   <div class="bd-toc-item active">
     
-    <p class="caption">
+    <p>
  <span class="caption-text">
   Supported Environments
  </span>
@@ -174,7 +179,7 @@
   </a>
  </li>
 </ul>
-<p class="caption">
+<p>
  <span class="caption-text">
   User Guide
  </span>
@@ -210,6 +215,11 @@
    </i>
   </label>
   <ul>
+   <li class="toctree-l2">
+    <a class="reference internal" href="../sql/sql_status.html">
+     Status
+    </a>
+   </li>
    <li class="toctree-l2">
     <a class="reference internal" href="../sql/select.html">
      SELECT syntax
@@ -314,12 +324,17 @@
   </a>
  </li>
 </ul>
-<p class="caption">
+<p>
  <span class="caption-text">
   Specification
  </span>
 </p>
 <ul class="nav bd-sidenav">
+ <li class="toctree-l1">
+  <a class="reference internal" href="../../specification/roadmap.html">
+   Roadmap
+  </a>
+ </li>
  <li class="toctree-l1">
   <a class="reference internal" href="../../specification/invariants.html">
    DataFusion’s Invariants
@@ -330,8 +345,13 @@
    Datafusion output field name semantic
   </a>
  </li>
+ <li class="toctree-l1">
+  <a class="reference internal" href="../../specification/quarterly_roadmap.html">
+   Roadmap
+  </a>
+ </li>
 </ul>
-<p class="caption">
+<p>
  <span class="caption-text">
   README
  </span>
@@ -348,7 +368,7 @@
   </a>
  </li>
 </ul>
-<p class="caption">
+<p>
  <span class="caption-text">
   Community
  </span>
@@ -364,11 +384,19 @@
    Issue tracker
   </a>
  </li>
+ <li class="toctree-l1">
+  <a class="reference external" href="https://github.com/apache/arrow-datafusion/blob/master/CODE_OF_CONDUCT.md">
+   Code of conduct
+  </a>
+ </li>
 </ul>
 
     
   </div>
 </nav>
+              </div>
+              <div class="sidebar-end-items">
+              </div>
             </div>
             
           
@@ -441,7 +469,7 @@
   specific language governing permissions and limitations
   under the License.
 -->
-<div class="section" id="overview">
+<section id="overview">
 <h1>Overview<a class="headerlink" href="#overview" title="Permalink to this headline">¶</a></h1>
 <p>Ballista is a distributed compute platform primarily implemented in Rust, and powered by Apache Arrow. It is
 built on an architecture that allows other programming languages to be supported as first-class citizens without paying
@@ -453,7 +481,7 @@ <h1>Overview<a class="headerlink" href="#overview" title="Permalink to this head
 <li><p><a class="reference external" href="https://developers.google.com/protocol-buffers">Google Protocol Buffers</a> for serializing query plans.</p></li>
 <li><p><a class="reference external" href="https://github.com/apache/arrow-datafusion/">DataFusion</a> for query execution.</p></li>
 </ul>
-<div class="section" id="how-does-this-compare-to-apache-spark">
+<section id="how-does-this-compare-to-apache-spark">
 <h2>How does this compare to Apache Spark?<a class="headerlink" href="#how-does-this-compare-to-apache-spark" title="Permalink to this headline">¶</a></h2>
 <p>Although Ballista is largely inspired by Apache Spark, there are some key differences.</p>
 <ul class="simple">
@@ -468,23 +496,34 @@ <h2>How does this compare to Apache Spark?<a class="headerlink" href="#how-does-
 <li><p>The use of Apache Arrow as the memory model and network protocol means that data can be exchanged between executors
 in any programming language with minimal serialization overhead.</p></li>
 </ul>
-</div>
-<div class="section" id="status">
+</section>
+<section id="status">
 <h2>Status<a class="headerlink" href="#status" title="Permalink to this headline">¶</a></h2>
 <p>Ballista is still in the early stages of development but is capable of executing complex analytical queries at scale.</p>
-</div>
-</div>
+</section>
+</section>
 
 
               </div>
               
               
-              <div class='prev-next-bottom'>
-                
-    <a class='left-prev' id="prev-link" href="index.html" title="previous page">Ballista Distributed Compute</a>
-    <a class='right-next' id="next-link" href="deployment/index.html" title="next page">Start a Ballista Cluster</a>
-
-              </div>
+              <!-- Previous / next buttons -->
+<div class='prev-next-area'>
+    <a class='left-prev' id="prev-link" href="index.html" title="previous page">
+        <i class="fas fa-angle-left"></i>
+        <div class="prev-next-info">
+            <p class="prev-next-subtitle">previous</p>
+            <p class="prev-next-title">Ballista Distributed Compute</p>
+        </div>
+    </a>
+    <a class='right-next' id="next-link" href="deployment/index.html" title="next page">
+    <div class="prev-next-info">
+        <p class="prev-next-subtitle">next</p>
+        <p class="prev-next-title">Start a Ballista Cluster</p>
+    </div>
+    <i class="fas fa-angle-right"></i>
+    </a>
+</div>
               
           </main>
           
@@ -492,20 +531,19 @@ <h2>Status<a class="headerlink" href="#status" title="Permalink to this headline
       </div>
     </div>
   
-  <script src="../../_static/js/index.1c5a1a01449ed65a7b51.js"></script>
-
+    <script src="../../_static/scripts/pydata-sphinx-theme.js?digest=1999514e3f237ded88cf"></script>
   <footer class="footer mt-5 mt-md-0">
   <div class="container">
     
     <div class="footer-item">
       <p class="copyright">
-    &copy; Copyright 2021, Apache Software Foundation.<br/>
+    &copy; Copyright 2021, Apache Software Foundation.<br>
 </p>
     </div>
     
     <div class="footer-item">
       <p class="sphinx-version">
-Created using <a href="http://sphinx-doc.org/">Sphinx</a> 2.4.4.<br/>
+Created using <a href="http://sphinx-doc.org/">Sphinx</a> 2.4.4.<br>
 </p>
     </div>
     
diff --git a/datafusion/user-guide/example-usage.html b/datafusion/user-guide/example-usage.html
index 34237d6aebb3..51b3541dfdb1 100644
--- a/datafusion/user-guide/example-usage.html
+++ b/datafusion/user-guide/example-usage.html
@@ -3,30 +3,31 @@
 
 <html xmlns="http://www.w3.org/1999/xhtml">
   <head>
-    <meta charset="utf-8" />
+    <meta charset="utf-8" /><meta name="generator" content="Docutils 0.17.1: http://docutils.sourceforge.net/" />
+
     <title>Example Usage &#8212; Arrow Datafusion  documentation</title>
     
-  <link href="../_static/css/theme.css" rel="stylesheet" />
-  <link href="../_static/css/index.c5995385ac14fb8791e8eb36b4908be2.css" rel="stylesheet" />
-
+    <link href="../_static/styles/theme.css?digest=1999514e3f237ded88cf" rel="stylesheet">
+<link href="../_static/styles/pydata-sphinx-theme.css?digest=1999514e3f237ded88cf" rel="stylesheet">
+  
     
-  <link rel="stylesheet"
-    href="../_static/vendor/fontawesome/5.13.0/css/all.min.css">
-  <link rel="preload" as="font" type="font/woff2" crossorigin
-    href="../_static/vendor/fontawesome/5.13.0/webfonts/fa-solid-900.woff2">
-  <link rel="preload" as="font" type="font/woff2" crossorigin
-    href="../_static/vendor/fontawesome/5.13.0/webfonts/fa-brands-400.woff2">
-
+    <link rel="stylesheet"
+      href="../_static/vendor/fontawesome/5.13.0/css/all.min.css">
+    <link rel="preload" as="font" type="font/woff2" crossorigin
+      href="../_static/vendor/fontawesome/5.13.0/webfonts/fa-solid-900.woff2">
+    <link rel="preload" as="font" type="font/woff2" crossorigin
+      href="../_static/vendor/fontawesome/5.13.0/webfonts/fa-brands-400.woff2">
+  
     
       
-
+  
     
-    <link rel="stylesheet" href="../_static/basic.css" type="text/css" />
+    <link rel="stylesheet" href="../_static/styles/pydata-sphinx-theme.css" type="text/css" />
     <link rel="stylesheet" href="../_static/pygments.css" type="text/css" />
     <link rel="stylesheet" type="text/css" href="../_static/theme_overrides.css" />
     
-  <link rel="preload" as="script" href="../_static/js/index.1c5a1a01449ed65a7b51.js">
-
+    <link rel="preload" as="script" href="../_static/scripts/pydata-sphinx-theme.js?digest=1999514e3f237ded88cf">
+  
     <script id="documentation_options" data-url_root="../" src="../_static/documentation_options.js"></script>
     <script src="../_static/jquery.js"></script>
     <script src="../_static/underscore.js"></script>
@@ -37,7 +38,10 @@
     <link rel="next" title="Using DataFusion as a library" href="library.html" />
     <link rel="prev" title="Introduction" href="introduction.html" />
     <meta name="viewport" content="width=device-width, initial-scale=1" />
-    <meta name="docsearch:language" content="en" />
+    <meta name="docsearch:language" content="None">
+    
+
+    <!-- Google Analytics -->
     
   </head>
   <body data-spy="scroll" data-target="#bd-toc-nav" data-offset="80">
@@ -53,6 +57,7 @@
             
             <!-- Only show if we have sidebars configured, else just a small margin  -->
             <div class="col-12 col-md-3 bd-sidebar">
+              <div class="sidebar-start-items">
 <a class="navbar-brand" href="../index.html">
   <img src="../_static/images/DataFusion-Logo-Background-White.png" class="logo" alt="logo">
 </a>
@@ -65,7 +70,7 @@
 <nav class="bd-links" id="bd-docs-nav" aria-label="Main navigation">
   <div class="bd-toc-item active">
     
-    <p class="caption">
+    <p>
  <span class="caption-text">
   Supported Environments
  </span>
@@ -174,7 +179,7 @@
   </a>
  </li>
 </ul>
-<p class="caption">
+<p>
  <span class="caption-text">
   User Guide
  </span>
@@ -210,6 +215,11 @@
    </i>
   </label>
   <ul>
+   <li class="toctree-l2">
+    <a class="reference internal" href="sql/sql_status.html">
+     Status
+    </a>
+   </li>
    <li class="toctree-l2">
     <a class="reference internal" href="sql/select.html">
      SELECT syntax
@@ -314,7 +324,7 @@
   </a>
  </li>
 </ul>
-<p class="caption">
+<p>
  <span class="caption-text">
   Specification
  </span>
@@ -335,8 +345,13 @@
    Datafusion output field name semantic
   </a>
  </li>
+ <li class="toctree-l1">
+  <a class="reference internal" href="../specification/quarterly_roadmap.html">
+   Roadmap
+  </a>
+ </li>
 </ul>
-<p class="caption">
+<p>
  <span class="caption-text">
   README
  </span>
@@ -353,7 +368,7 @@
   </a>
  </li>
 </ul>
-<p class="caption">
+<p>
  <span class="caption-text">
   Community
  </span>
@@ -379,6 +394,9 @@
     
   </div>
 </nav>
+              </div>
+              <div class="sidebar-end-items">
+              </div>
             </div>
             
           
@@ -436,7 +454,7 @@
   specific language governing permissions and limitations
   under the License.
 -->
-<div class="section" id="example-usage">
+<section id="example-usage">
 <h1>Example Usage<a class="headerlink" href="#example-usage" title="Permalink to this headline">¶</a></h1>
 <p>Run a SQL query against data stored in a CSV:</p>
 <div class="highlight-rust notranslate"><div class="highlight"><pre><span></span><span class="k">use</span><span class="w"> </span><span class="n">datafusion</span>::<span class="n">prelude</span>::<span class="o">*</span><span class="p">;</span><span class="w"></span>
@@ -482,18 +500,29 @@ <h1>Example Usage<a class="headerlink" href="#example-usage" title="Permalink to
 +---+--------+
 </pre></div>
 </div>
-</div>
+</section>
 
 
               </div>
               
               
-              <div class='prev-next-bottom'>
-                
-    <a class='left-prev' id="prev-link" href="introduction.html" title="previous page">Introduction</a>
-    <a class='right-next' id="next-link" href="library.html" title="next page">Using DataFusion as a library</a>
-
-              </div>
+              <!-- Previous / next buttons -->
+<div class='prev-next-area'>
+    <a class='left-prev' id="prev-link" href="introduction.html" title="previous page">
+        <i class="fas fa-angle-left"></i>
+        <div class="prev-next-info">
+            <p class="prev-next-subtitle">previous</p>
+            <p class="prev-next-title">Introduction</p>
+        </div>
+    </a>
+    <a class='right-next' id="next-link" href="library.html" title="next page">
+    <div class="prev-next-info">
+        <p class="prev-next-subtitle">next</p>
+        <p class="prev-next-title">Using DataFusion as a library</p>
+    </div>
+    <i class="fas fa-angle-right"></i>
+    </a>
+</div>
               
           </main>
           
@@ -501,20 +530,19 @@ <h1>Example Usage<a class="headerlink" href="#example-usage" title="Permalink to
       </div>
     </div>
   
-  <script src="../_static/js/index.1c5a1a01449ed65a7b51.js"></script>
-
+    <script src="../_static/scripts/pydata-sphinx-theme.js?digest=1999514e3f237ded88cf"></script>
   <footer class="footer mt-5 mt-md-0">
   <div class="container">
     
     <div class="footer-item">
       <p class="copyright">
-    &copy; Copyright 2021, Apache Software Foundation.<br/>
+    &copy; Copyright 2021, Apache Software Foundation.<br>
 </p>
     </div>
     
     <div class="footer-item">
       <p class="sphinx-version">
-Created using <a href="http://sphinx-doc.org/">Sphinx</a> 2.4.4.<br/>
+Created using <a href="http://sphinx-doc.org/">Sphinx</a> 2.4.4.<br>
 </p>
     </div>
     
diff --git a/datafusion/user-guide/faq.html b/datafusion/user-guide/faq.html
index 89059da3d8ed..7b1a39c9ea82 100644
--- a/datafusion/user-guide/faq.html
+++ b/datafusion/user-guide/faq.html
@@ -3,30 +3,31 @@
 
 <html xmlns="http://www.w3.org/1999/xhtml">
   <head>
-    <meta charset="utf-8" />
+    <meta charset="utf-8" /><meta name="generator" content="Docutils 0.17.1: http://docutils.sourceforge.net/" />
+
     <title>Frequently Asked Questions &#8212; Arrow Datafusion  documentation</title>
     
-  <link href="../_static/css/theme.css" rel="stylesheet" />
-  <link href="../_static/css/index.c5995385ac14fb8791e8eb36b4908be2.css" rel="stylesheet" />
-
+    <link href="../_static/styles/theme.css?digest=1999514e3f237ded88cf" rel="stylesheet">
+<link href="../_static/styles/pydata-sphinx-theme.css?digest=1999514e3f237ded88cf" rel="stylesheet">
+  
     
-  <link rel="stylesheet"
-    href="../_static/vendor/fontawesome/5.13.0/css/all.min.css">
-  <link rel="preload" as="font" type="font/woff2" crossorigin
-    href="../_static/vendor/fontawesome/5.13.0/webfonts/fa-solid-900.woff2">
-  <link rel="preload" as="font" type="font/woff2" crossorigin
-    href="../_static/vendor/fontawesome/5.13.0/webfonts/fa-brands-400.woff2">
-
+    <link rel="stylesheet"
+      href="../_static/vendor/fontawesome/5.13.0/css/all.min.css">
+    <link rel="preload" as="font" type="font/woff2" crossorigin
+      href="../_static/vendor/fontawesome/5.13.0/webfonts/fa-solid-900.woff2">
+    <link rel="preload" as="font" type="font/woff2" crossorigin
+      href="../_static/vendor/fontawesome/5.13.0/webfonts/fa-brands-400.woff2">
+  
     
       
-
+  
     
-    <link rel="stylesheet" href="../_static/basic.css" type="text/css" />
+    <link rel="stylesheet" href="../_static/styles/pydata-sphinx-theme.css" type="text/css" />
     <link rel="stylesheet" href="../_static/pygments.css" type="text/css" />
     <link rel="stylesheet" type="text/css" href="../_static/theme_overrides.css" />
     
-  <link rel="preload" as="script" href="../_static/js/index.1c5a1a01449ed65a7b51.js">
-
+    <link rel="preload" as="script" href="../_static/scripts/pydata-sphinx-theme.js?digest=1999514e3f237ded88cf">
+  
     <script id="documentation_options" data-url_root="../" src="../_static/documentation_options.js"></script>
     <script src="../_static/jquery.js"></script>
     <script src="../_static/underscore.js"></script>
@@ -34,10 +35,13 @@
     <script src="../_static/language_data.js"></script>
     <link rel="index" title="Index" href="../genindex.html" />
     <link rel="search" title="Search" href="../search.html" />
-    <link rel="next" title="DataFusion’s Invariants" href="../specification/invariants.html" />
+    <link rel="next" title="Roadmap" href="../specification/roadmap.html" />
     <link rel="prev" title="Python" href="distributed/clients/python.html" />
     <meta name="viewport" content="width=device-width, initial-scale=1" />
-    <meta name="docsearch:language" content="en" />
+    <meta name="docsearch:language" content="None">
+    
+
+    <!-- Google Analytics -->
     
   </head>
   <body data-spy="scroll" data-target="#bd-toc-nav" data-offset="80">
@@ -53,6 +57,7 @@
             
             <!-- Only show if we have sidebars configured, else just a small margin  -->
             <div class="col-12 col-md-3 bd-sidebar">
+              <div class="sidebar-start-items">
 <a class="navbar-brand" href="../index.html">
   <img src="../_static/images/DataFusion-Logo-Background-White.png" class="logo" alt="logo">
 </a>
@@ -65,7 +70,7 @@
 <nav class="bd-links" id="bd-docs-nav" aria-label="Main navigation">
   <div class="bd-toc-item active">
     
-    <p class="caption">
+    <p>
  <span class="caption-text">
   Supported Environments
  </span>
@@ -174,7 +179,7 @@
   </a>
  </li>
 </ul>
-<p class="caption">
+<p>
  <span class="caption-text">
   User Guide
  </span>
@@ -210,6 +215,11 @@
    </i>
   </label>
   <ul>
+   <li class="toctree-l2">
+    <a class="reference internal" href="sql/sql_status.html">
+     Status
+    </a>
+   </li>
    <li class="toctree-l2">
     <a class="reference internal" href="sql/select.html">
      SELECT syntax
@@ -314,12 +324,17 @@
   </a>
  </li>
 </ul>
-<p class="caption">
+<p>
  <span class="caption-text">
   Specification
  </span>
 </p>
 <ul class="nav bd-sidenav">
+ <li class="toctree-l1">
+  <a class="reference internal" href="../specification/roadmap.html">
+   Roadmap
+  </a>
+ </li>
  <li class="toctree-l1">
   <a class="reference internal" href="../specification/invariants.html">
    DataFusion’s Invariants
@@ -330,8 +345,13 @@
    Datafusion output field name semantic
   </a>
  </li>
+ <li class="toctree-l1">
+  <a class="reference internal" href="../specification/quarterly_roadmap.html">
+   Roadmap
+  </a>
+ </li>
 </ul>
-<p class="caption">
+<p>
  <span class="caption-text">
   README
  </span>
@@ -348,7 +368,7 @@
   </a>
  </li>
 </ul>
-<p class="caption">
+<p>
  <span class="caption-text">
   Community
  </span>
@@ -364,11 +384,19 @@
    Issue tracker
   </a>
  </li>
+ <li class="toctree-l1">
+  <a class="reference external" href="https://github.com/apache/arrow-datafusion/blob/master/CODE_OF_CONDUCT.md">
+   Code of conduct
+  </a>
+ </li>
 </ul>
 
     
   </div>
 </nav>
+              </div>
+              <div class="sidebar-end-items">
+              </div>
             </div>
             
           
@@ -436,9 +464,9 @@
   specific language governing permissions and limitations
   under the License.
 -->
-<div class="section" id="frequently-asked-questions">
+<section id="frequently-asked-questions">
 <h1>Frequently Asked Questions<a class="headerlink" href="#frequently-asked-questions" title="Permalink to this headline">¶</a></h1>
-<div class="section" id="what-is-the-relationship-between-apache-arrow-datafusion-and-ballista">
+<section id="what-is-the-relationship-between-apache-arrow-datafusion-and-ballista">
 <h2>What is the relationship between Apache Arrow, DataFusion, and Ballista?<a class="headerlink" href="#what-is-the-relationship-between-apache-arrow-datafusion-and-ballista" title="Permalink to this headline">¶</a></h2>
 <p>Apache Arrow is a library which provides a standardized memory representation for columnar data. It also provides
 “kernels” for performing common operations on this data.</p>
@@ -446,19 +474,30 @@ <h2>What is the relationship between Apache Arrow, DataFusion, and Ballista?<a c
 model and computational kernels. It is designed to run within a single process, using threads
 for parallel query execution.</p>
 <p>Ballista is a distributed compute platform built on DataFusion.</p>
-</div>
-</div>
+</section>
+</section>
 
 
               </div>
               
               
-              <div class='prev-next-bottom'>
-                
-    <a class='left-prev' id="prev-link" href="distributed/clients/python.html" title="previous page">Python</a>
-    <a class='right-next' id="next-link" href="../specification/invariants.html" title="next page">DataFusion’s Invariants</a>
-
-              </div>
+              <!-- Previous / next buttons -->
+<div class='prev-next-area'>
+    <a class='left-prev' id="prev-link" href="distributed/clients/python.html" title="previous page">
+        <i class="fas fa-angle-left"></i>
+        <div class="prev-next-info">
+            <p class="prev-next-subtitle">previous</p>
+            <p class="prev-next-title">Python</p>
+        </div>
+    </a>
+    <a class='right-next' id="next-link" href="../specification/roadmap.html" title="next page">
+    <div class="prev-next-info">
+        <p class="prev-next-subtitle">next</p>
+        <p class="prev-next-title">Roadmap</p>
+    </div>
+    <i class="fas fa-angle-right"></i>
+    </a>
+</div>
               
           </main>
           
@@ -466,20 +505,19 @@ <h2>What is the relationship between Apache Arrow, DataFusion, and Ballista?<a c
       </div>
     </div>
   
-  <script src="../_static/js/index.1c5a1a01449ed65a7b51.js"></script>
-
+    <script src="../_static/scripts/pydata-sphinx-theme.js?digest=1999514e3f237ded88cf"></script>
   <footer class="footer mt-5 mt-md-0">
   <div class="container">
     
     <div class="footer-item">
       <p class="copyright">
-    &copy; Copyright 2021, Apache Software Foundation.<br/>
+    &copy; Copyright 2021, Apache Software Foundation.<br>
 </p>
     </div>
     
     <div class="footer-item">
       <p class="sphinx-version">
-Created using <a href="http://sphinx-doc.org/">Sphinx</a> 2.4.4.<br/>
+Created using <a href="http://sphinx-doc.org/">Sphinx</a> 2.4.4.<br>
 </p>
     </div>
     
diff --git a/datafusion/user-guide/introduction.html b/datafusion/user-guide/introduction.html
index 119e180e515a..cade389ec1f1 100644
--- a/datafusion/user-guide/introduction.html
+++ b/datafusion/user-guide/introduction.html
@@ -3,30 +3,31 @@
 
 <html xmlns="http://www.w3.org/1999/xhtml">
   <head>
-    <meta charset="utf-8" />
+    <meta charset="utf-8" /><meta name="generator" content="Docutils 0.17.1: http://docutils.sourceforge.net/" />
+
     <title>Introduction &#8212; Arrow Datafusion  documentation</title>
     
-  <link href="../_static/css/theme.css" rel="stylesheet" />
-  <link href="../_static/css/index.c5995385ac14fb8791e8eb36b4908be2.css" rel="stylesheet" />
-
+    <link href="../_static/styles/theme.css?digest=1999514e3f237ded88cf" rel="stylesheet">
+<link href="../_static/styles/pydata-sphinx-theme.css?digest=1999514e3f237ded88cf" rel="stylesheet">
+  
     
-  <link rel="stylesheet"
-    href="../_static/vendor/fontawesome/5.13.0/css/all.min.css">
-  <link rel="preload" as="font" type="font/woff2" crossorigin
-    href="../_static/vendor/fontawesome/5.13.0/webfonts/fa-solid-900.woff2">
-  <link rel="preload" as="font" type="font/woff2" crossorigin
-    href="../_static/vendor/fontawesome/5.13.0/webfonts/fa-brands-400.woff2">
-
+    <link rel="stylesheet"
+      href="../_static/vendor/fontawesome/5.13.0/css/all.min.css">
+    <link rel="preload" as="font" type="font/woff2" crossorigin
+      href="../_static/vendor/fontawesome/5.13.0/webfonts/fa-solid-900.woff2">
+    <link rel="preload" as="font" type="font/woff2" crossorigin
+      href="../_static/vendor/fontawesome/5.13.0/webfonts/fa-brands-400.woff2">
+  
     
       
-
+  
     
-    <link rel="stylesheet" href="../_static/basic.css" type="text/css" />
+    <link rel="stylesheet" href="../_static/styles/pydata-sphinx-theme.css" type="text/css" />
     <link rel="stylesheet" href="../_static/pygments.css" type="text/css" />
     <link rel="stylesheet" type="text/css" href="../_static/theme_overrides.css" />
     
-  <link rel="preload" as="script" href="../_static/js/index.1c5a1a01449ed65a7b51.js">
-
+    <link rel="preload" as="script" href="../_static/scripts/pydata-sphinx-theme.js?digest=1999514e3f237ded88cf">
+  
     <script id="documentation_options" data-url_root="../" src="../_static/documentation_options.js"></script>
     <script src="../_static/jquery.js"></script>
     <script src="../_static/underscore.js"></script>
@@ -37,7 +38,10 @@
     <link rel="next" title="Example Usage" href="example-usage.html" />
     <link rel="prev" title="DataFusion Command-line" href="../cli/index.html" />
     <meta name="viewport" content="width=device-width, initial-scale=1" />
-    <meta name="docsearch:language" content="en" />
+    <meta name="docsearch:language" content="None">
+    
+
+    <!-- Google Analytics -->
     
   </head>
   <body data-spy="scroll" data-target="#bd-toc-nav" data-offset="80">
@@ -53,6 +57,7 @@
             
             <!-- Only show if we have sidebars configured, else just a small margin  -->
             <div class="col-12 col-md-3 bd-sidebar">
+              <div class="sidebar-start-items">
 <a class="navbar-brand" href="../index.html">
   <img src="../_static/images/DataFusion-Logo-Background-White.png" class="logo" alt="logo">
 </a>
@@ -65,7 +70,7 @@
 <nav class="bd-links" id="bd-docs-nav" aria-label="Main navigation">
   <div class="bd-toc-item active">
     
-    <p class="caption">
+    <p>
  <span class="caption-text">
   Supported Environments
  </span>
@@ -174,7 +179,7 @@
   </a>
  </li>
 </ul>
-<p class="caption">
+<p>
  <span class="caption-text">
   User Guide
  </span>
@@ -210,6 +215,11 @@
    </i>
   </label>
   <ul>
+   <li class="toctree-l2">
+    <a class="reference internal" href="sql/sql_status.html">
+     Status
+    </a>
+   </li>
    <li class="toctree-l2">
     <a class="reference internal" href="sql/select.html">
      SELECT syntax
@@ -314,12 +324,17 @@
   </a>
  </li>
 </ul>
-<p class="caption">
+<p>
  <span class="caption-text">
   Specification
  </span>
 </p>
 <ul class="nav bd-sidenav">
+ <li class="toctree-l1">
+  <a class="reference internal" href="../specification/roadmap.html">
+   Roadmap
+  </a>
+ </li>
  <li class="toctree-l1">
   <a class="reference internal" href="../specification/invariants.html">
    DataFusion’s Invariants
@@ -330,8 +345,13 @@
    Datafusion output field name semantic
   </a>
  </li>
+ <li class="toctree-l1">
+  <a class="reference internal" href="../specification/quarterly_roadmap.html">
+   Roadmap
+  </a>
+ </li>
 </ul>
-<p class="caption">
+<p>
  <span class="caption-text">
   README
  </span>
@@ -348,7 +368,7 @@
   </a>
  </li>
 </ul>
-<p class="caption">
+<p>
  <span class="caption-text">
   Community
  </span>
@@ -364,11 +384,19 @@
    Issue tracker
   </a>
  </li>
+ <li class="toctree-l1">
+  <a class="reference external" href="https://github.com/apache/arrow-datafusion/blob/master/CODE_OF_CONDUCT.md">
+   Code of conduct
+  </a>
+ </li>
 </ul>
 
     
   </div>
 </nav>
+              </div>
+              <div class="sidebar-end-items">
+              </div>
             </div>
             
           
@@ -441,7 +469,7 @@
   specific language governing permissions and limitations
   under the License.
 -->
-<div class="section" id="introduction">
+<section id="introduction">
 <h1>Introduction<a class="headerlink" href="#introduction" title="Permalink to this headline">¶</a></h1>
 <p>DataFusion is an extensible query execution framework, written in
 Rust, that uses <a class="reference external" href="https://arrow.apache.org">Apache Arrow</a> as its
@@ -450,14 +478,14 @@ <h1>Introduction<a class="headerlink" href="#introduction" title="Permalink to t
 logical query plans as well as a query optimizer and execution engine
 capable of parallel execution against partitioned data sources (CSV
 and Parquet) using threads.</p>
-<div class="section" id="use-cases">
+<section id="use-cases">
 <h2>Use Cases<a class="headerlink" href="#use-cases" title="Permalink to this headline">¶</a></h2>
 <p>DataFusion is used to create modern, fast and efficient data
 pipelines, ETL processes, and database systems, which need the
 performance of Rust and Apache Arrow and want to provide their users
 the convenience of an SQL interface or a DataFrame API.</p>
-</div>
-<div class="section" id="why-datafusion">
+</section>
+<section id="why-datafusion">
 <h2>Why DataFusion?<a class="headerlink" href="#why-datafusion" title="Permalink to this headline">¶</a></h2>
 <ul class="simple">
 <li><p><em>High Performance</em>: Leveraging Rust and Arrow’s memory model, DataFusion achieves very high performance</p></li>
@@ -465,19 +493,30 @@ <h2>Why DataFusion?<a class="headerlink" href="#why-datafusion" title="Permalink
 <li><p><em>Easy to Embed</em>: Allowing extension at almost any point in its design, DataFusion can be tailored for your specific usecase</p></li>
 <li><p><em>High Quality</em>: Extensively tested, both by itself and with the rest of the Arrow ecosystem, DataFusion can be used as the foundation for production systems.</p></li>
 </ul>
-</div>
-</div>
+</section>
+</section>
 
 
               </div>
               
               
-              <div class='prev-next-bottom'>
-                
-    <a class='left-prev' id="prev-link" href="../cli/index.html" title="previous page">DataFusion Command-line</a>
-    <a class='right-next' id="next-link" href="example-usage.html" title="next page">Example Usage</a>
-
-              </div>
+              <!-- Previous / next buttons -->
+<div class='prev-next-area'>
+    <a class='left-prev' id="prev-link" href="../cli/index.html" title="previous page">
+        <i class="fas fa-angle-left"></i>
+        <div class="prev-next-info">
+            <p class="prev-next-subtitle">previous</p>
+            <p class="prev-next-title">DataFusion Command-line</p>
+        </div>
+    </a>
+    <a class='right-next' id="next-link" href="example-usage.html" title="next page">
+    <div class="prev-next-info">
+        <p class="prev-next-subtitle">next</p>
+        <p class="prev-next-title">Example Usage</p>
+    </div>
+    <i class="fas fa-angle-right"></i>
+    </a>
+</div>
               
           </main>
           
@@ -485,20 +524,19 @@ <h2>Why DataFusion?<a class="headerlink" href="#why-datafusion" title="Permalink
       </div>
     </div>
   
-  <script src="../_static/js/index.1c5a1a01449ed65a7b51.js"></script>
-
+    <script src="../_static/scripts/pydata-sphinx-theme.js?digest=1999514e3f237ded88cf"></script>
   <footer class="footer mt-5 mt-md-0">
   <div class="container">
     
     <div class="footer-item">
       <p class="copyright">
-    &copy; Copyright 2021, Apache Software Foundation.<br/>
+    &copy; Copyright 2021, Apache Software Foundation.<br>
 </p>
     </div>
     
     <div class="footer-item">
       <p class="sphinx-version">
-Created using <a href="http://sphinx-doc.org/">Sphinx</a> 2.4.4.<br/>
+Created using <a href="http://sphinx-doc.org/">Sphinx</a> 2.4.4.<br>
 </p>
     </div>
     
diff --git a/datafusion/user-guide/library.html b/datafusion/user-guide/library.html
index abc081cc3a79..34d878db8eeb 100644
--- a/datafusion/user-guide/library.html
+++ b/datafusion/user-guide/library.html
@@ -3,30 +3,31 @@
 
 <html xmlns="http://www.w3.org/1999/xhtml">
   <head>
-    <meta charset="utf-8" />
+    <meta charset="utf-8" /><meta name="generator" content="Docutils 0.17.1: http://docutils.sourceforge.net/" />
+
     <title>Using DataFusion as a library &#8212; Arrow Datafusion  documentation</title>
     
-  <link href="../_static/css/theme.css" rel="stylesheet" />
-  <link href="../_static/css/index.c5995385ac14fb8791e8eb36b4908be2.css" rel="stylesheet" />
-
+    <link href="../_static/styles/theme.css?digest=1999514e3f237ded88cf" rel="stylesheet">
+<link href="../_static/styles/pydata-sphinx-theme.css?digest=1999514e3f237ded88cf" rel="stylesheet">
+  
     
-  <link rel="stylesheet"
-    href="../_static/vendor/fontawesome/5.13.0/css/all.min.css">
-  <link rel="preload" as="font" type="font/woff2" crossorigin
-    href="../_static/vendor/fontawesome/5.13.0/webfonts/fa-solid-900.woff2">
-  <link rel="preload" as="font" type="font/woff2" crossorigin
-    href="../_static/vendor/fontawesome/5.13.0/webfonts/fa-brands-400.woff2">
-
+    <link rel="stylesheet"
+      href="../_static/vendor/fontawesome/5.13.0/css/all.min.css">
+    <link rel="preload" as="font" type="font/woff2" crossorigin
+      href="../_static/vendor/fontawesome/5.13.0/webfonts/fa-solid-900.woff2">
+    <link rel="preload" as="font" type="font/woff2" crossorigin
+      href="../_static/vendor/fontawesome/5.13.0/webfonts/fa-brands-400.woff2">
+  
     
       
-
+  
     
-    <link rel="stylesheet" href="../_static/basic.css" type="text/css" />
+    <link rel="stylesheet" href="../_static/styles/pydata-sphinx-theme.css" type="text/css" />
     <link rel="stylesheet" href="../_static/pygments.css" type="text/css" />
     <link rel="stylesheet" type="text/css" href="../_static/theme_overrides.css" />
     
-  <link rel="preload" as="script" href="../_static/js/index.1c5a1a01449ed65a7b51.js">
-
+    <link rel="preload" as="script" href="../_static/scripts/pydata-sphinx-theme.js?digest=1999514e3f237ded88cf">
+  
     <script id="documentation_options" data-url_root="../" src="../_static/documentation_options.js"></script>
     <script src="../_static/jquery.js"></script>
     <script src="../_static/underscore.js"></script>
@@ -37,7 +38,10 @@
     <link rel="next" title="DataFusion Command-line Interface" href="cli.html" />
     <link rel="prev" title="Example Usage" href="example-usage.html" />
     <meta name="viewport" content="width=device-width, initial-scale=1" />
-    <meta name="docsearch:language" content="en" />
+    <meta name="docsearch:language" content="None">
+    
+
+    <!-- Google Analytics -->
     
   </head>
   <body data-spy="scroll" data-target="#bd-toc-nav" data-offset="80">
@@ -53,6 +57,7 @@
             
             <!-- Only show if we have sidebars configured, else just a small margin  -->
             <div class="col-12 col-md-3 bd-sidebar">
+              <div class="sidebar-start-items">
 <a class="navbar-brand" href="../index.html">
   <img src="../_static/images/DataFusion-Logo-Background-White.png" class="logo" alt="logo">
 </a>
@@ -65,7 +70,7 @@
 <nav class="bd-links" id="bd-docs-nav" aria-label="Main navigation">
   <div class="bd-toc-item active">
     
-    <p class="caption">
+    <p>
  <span class="caption-text">
   Supported Environments
  </span>
@@ -174,7 +179,7 @@
   </a>
  </li>
 </ul>
-<p class="caption">
+<p>
  <span class="caption-text">
   User Guide
  </span>
@@ -210,6 +215,11 @@
    </i>
   </label>
   <ul>
+   <li class="toctree-l2">
+    <a class="reference internal" href="sql/sql_status.html">
+     Status
+    </a>
+   </li>
    <li class="toctree-l2">
     <a class="reference internal" href="sql/select.html">
      SELECT syntax
@@ -314,7 +324,7 @@
   </a>
  </li>
 </ul>
-<p class="caption">
+<p>
  <span class="caption-text">
   Specification
  </span>
@@ -335,8 +345,13 @@
    Datafusion output field name semantic
   </a>
  </li>
+ <li class="toctree-l1">
+  <a class="reference internal" href="../specification/quarterly_roadmap.html">
+   Roadmap
+  </a>
+ </li>
 </ul>
-<p class="caption">
+<p>
  <span class="caption-text">
   README
  </span>
@@ -353,7 +368,7 @@
   </a>
  </li>
 </ul>
-<p class="caption">
+<p>
  <span class="caption-text">
   Community
  </span>
@@ -379,6 +394,9 @@
     
   </div>
 </nav>
+              </div>
+              <div class="sidebar-end-items">
+              </div>
             </div>
             
           
@@ -451,9 +469,9 @@
   specific language governing permissions and limitations
   under the License.
 -->
-<div class="section" id="using-datafusion-as-a-library">
+<section id="using-datafusion-as-a-library">
 <h1>Using DataFusion as a library<a class="headerlink" href="#using-datafusion-as-a-library" title="Permalink to this headline">¶</a></h1>
-<div class="section" id="default-configuration">
+<section id="default-configuration">
 <h2>Default Configuration<a class="headerlink" href="#default-configuration" title="Permalink to this headline">¶</a></h2>
 <p>DataFusion is <a class="reference external" href="https://crates.io/crates/datafusion">published on crates.io</a>, and is <a class="reference external" href="https://docs.rs/datafusion/">well documented on docs.rs</a>.</p>
 <p>To get started, add the following to your <code class="docutils literal notranslate"><span class="pre">Cargo.toml</span></code> file:</p>
@@ -461,8 +479,8 @@ <h2>Default Configuration<a class="headerlink" href="#default-configuration" tit
 <span class="n">datafusion</span> <span class="o">=</span> <span class="s">&quot;5.1.0&quot;</span>
 </pre></div>
 </div>
-</div>
-<div class="section" id="optimized-configuration">
+</section>
+<section id="optimized-configuration">
 <h2>Optimized Configuration<a class="headerlink" href="#optimized-configuration" title="Permalink to this headline">¶</a></h2>
 <p>For an optimized build several steps are required. First, use the below in your <code class="docutils literal notranslate"><span class="pre">Cargo.toml</span></code>. It is
 worth noting that using the settings in the <code class="docutils literal notranslate"><span class="pre">[profile.release]</span></code> section will significantly increase the build time.</p>
@@ -487,19 +505,30 @@ <h2>Optimized Configuration<a class="headerlink" href="#optimized-configuration"
 <div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="n">RUSTFLAGS</span><span class="o">=</span><span class="s1">&#39;-C target-cpu=native&#39;</span> <span class="n">cargo</span> <span class="o">+</span><span class="n">nightly</span> <span class="n">run</span> <span class="o">--</span><span class="n">release</span>
 </pre></div>
 </div>
-</div>
-</div>
+</section>
+</section>
 
 
               </div>
               
               
-              <div class='prev-next-bottom'>
-                
-    <a class='left-prev' id="prev-link" href="example-usage.html" title="previous page">Example Usage</a>
-    <a class='right-next' id="next-link" href="cli.html" title="next page">DataFusion Command-line Interface</a>
-
-              </div>
+              <!-- Previous / next buttons -->
+<div class='prev-next-area'>
+    <a class='left-prev' id="prev-link" href="example-usage.html" title="previous page">
+        <i class="fas fa-angle-left"></i>
+        <div class="prev-next-info">
+            <p class="prev-next-subtitle">previous</p>
+            <p class="prev-next-title">Example Usage</p>
+        </div>
+    </a>
+    <a class='right-next' id="next-link" href="cli.html" title="next page">
+    <div class="prev-next-info">
+        <p class="prev-next-subtitle">next</p>
+        <p class="prev-next-title">DataFusion Command-line Interface</p>
+    </div>
+    <i class="fas fa-angle-right"></i>
+    </a>
+</div>
               
           </main>
           
@@ -507,20 +536,19 @@ <h2>Optimized Configuration<a class="headerlink" href="#optimized-configuration"
       </div>
     </div>
   
-  <script src="../_static/js/index.1c5a1a01449ed65a7b51.js"></script>
-
+    <script src="../_static/scripts/pydata-sphinx-theme.js?digest=1999514e3f237ded88cf"></script>
   <footer class="footer mt-5 mt-md-0">
   <div class="container">
     
     <div class="footer-item">
       <p class="copyright">
-    &copy; Copyright 2021, Apache Software Foundation.<br/>
+    &copy; Copyright 2021, Apache Software Foundation.<br>
 </p>
     </div>
     
     <div class="footer-item">
       <p class="sphinx-version">
-Created using <a href="http://sphinx-doc.org/">Sphinx</a> 2.4.4.<br/>
+Created using <a href="http://sphinx-doc.org/">Sphinx</a> 2.4.4.<br>
 </p>
     </div>
     
diff --git a/datafusion/user-guide/sql/datafusion-functions.html b/datafusion/user-guide/sql/datafusion-functions.html
index 582bb946a6cc..6fca948b55ea 100644
--- a/datafusion/user-guide/sql/datafusion-functions.html
+++ b/datafusion/user-guide/sql/datafusion-functions.html
@@ -3,30 +3,31 @@
 
 <html xmlns="http://www.w3.org/1999/xhtml">
   <head>
-    <meta charset="utf-8" />
+    <meta charset="utf-8" /><meta name="generator" content="Docutils 0.17.1: http://docutils.sourceforge.net/" />
+
     <title>Datafusion-Specific Functions &#8212; Arrow Datafusion  documentation</title>
     
-  <link href="../../_static/css/theme.css" rel="stylesheet" />
-  <link href="../../_static/css/index.c5995385ac14fb8791e8eb36b4908be2.css" rel="stylesheet" />
-
+    <link href="../../_static/styles/theme.css?digest=1999514e3f237ded88cf" rel="stylesheet">
+<link href="../../_static/styles/pydata-sphinx-theme.css?digest=1999514e3f237ded88cf" rel="stylesheet">
+  
     
-  <link rel="stylesheet"
-    href="../../_static/vendor/fontawesome/5.13.0/css/all.min.css">
-  <link rel="preload" as="font" type="font/woff2" crossorigin
-    href="../../_static/vendor/fontawesome/5.13.0/webfonts/fa-solid-900.woff2">
-  <link rel="preload" as="font" type="font/woff2" crossorigin
-    href="../../_static/vendor/fontawesome/5.13.0/webfonts/fa-brands-400.woff2">
-
+    <link rel="stylesheet"
+      href="../../_static/vendor/fontawesome/5.13.0/css/all.min.css">
+    <link rel="preload" as="font" type="font/woff2" crossorigin
+      href="../../_static/vendor/fontawesome/5.13.0/webfonts/fa-solid-900.woff2">
+    <link rel="preload" as="font" type="font/woff2" crossorigin
+      href="../../_static/vendor/fontawesome/5.13.0/webfonts/fa-brands-400.woff2">
+  
     
       
-
+  
     
-    <link rel="stylesheet" href="../../_static/basic.css" type="text/css" />
+    <link rel="stylesheet" href="../../_static/styles/pydata-sphinx-theme.css" type="text/css" />
     <link rel="stylesheet" href="../../_static/pygments.css" type="text/css" />
     <link rel="stylesheet" type="text/css" href="../../_static/theme_overrides.css" />
     
-  <link rel="preload" as="script" href="../../_static/js/index.1c5a1a01449ed65a7b51.js">
-
+    <link rel="preload" as="script" href="../../_static/scripts/pydata-sphinx-theme.js?digest=1999514e3f237ded88cf">
+  
     <script id="documentation_options" data-url_root="../../" src="../../_static/documentation_options.js"></script>
     <script src="../../_static/jquery.js"></script>
     <script src="../../_static/underscore.js"></script>
@@ -37,7 +38,10 @@
     <link rel="next" title="Ballista Distributed Compute" href="../distributed/index.html" />
     <link rel="prev" title="DDL" href="ddl.html" />
     <meta name="viewport" content="width=device-width, initial-scale=1" />
-    <meta name="docsearch:language" content="en" />
+    <meta name="docsearch:language" content="None">
+    
+
+    <!-- Google Analytics -->
     
   </head>
   <body data-spy="scroll" data-target="#bd-toc-nav" data-offset="80">
@@ -53,6 +57,7 @@
             
             <!-- Only show if we have sidebars configured, else just a small margin  -->
             <div class="col-12 col-md-3 bd-sidebar">
+              <div class="sidebar-start-items">
 <a class="navbar-brand" href="../../index.html">
   <img src="../../_static/images/DataFusion-Logo-Background-White.png" class="logo" alt="logo">
 </a>
@@ -65,7 +70,7 @@
 <nav class="bd-links" id="bd-docs-nav" aria-label="Main navigation">
   <div class="bd-toc-item active">
     
-    <p class="caption">
+    <p>
  <span class="caption-text">
   Supported Environments
  </span>
@@ -174,7 +179,7 @@
   </a>
  </li>
 </ul>
-<p class="caption">
+<p>
  <span class="caption-text">
   User Guide
  </span>
@@ -210,6 +215,11 @@
    </i>
   </label>
   <ul class="current">
+   <li class="toctree-l2">
+    <a class="reference internal" href="sql_status.html">
+     Status
+    </a>
+   </li>
    <li class="toctree-l2">
     <a class="reference internal" href="select.html">
      SELECT syntax
@@ -314,12 +324,17 @@
   </a>
  </li>
 </ul>
-<p class="caption">
+<p>
  <span class="caption-text">
   Specification
  </span>
 </p>
 <ul class="nav bd-sidenav">
+ <li class="toctree-l1">
+  <a class="reference internal" href="../../specification/roadmap.html">
+   Roadmap
+  </a>
+ </li>
  <li class="toctree-l1">
   <a class="reference internal" href="../../specification/invariants.html">
    DataFusion’s Invariants
@@ -330,8 +345,13 @@
    Datafusion output field name semantic
   </a>
  </li>
+ <li class="toctree-l1">
+  <a class="reference internal" href="../../specification/quarterly_roadmap.html">
+   Roadmap
+  </a>
+ </li>
 </ul>
-<p class="caption">
+<p>
  <span class="caption-text">
   README
  </span>
@@ -348,7 +368,7 @@
   </a>
  </li>
 </ul>
-<p class="caption">
+<p>
  <span class="caption-text">
   Community
  </span>
@@ -364,11 +384,19 @@
    Issue tracker
   </a>
  </li>
+ <li class="toctree-l1">
+  <a class="reference external" href="https://github.com/apache/arrow-datafusion/blob/master/CODE_OF_CONDUCT.md">
+   Code of conduct
+  </a>
+ </li>
 </ul>
 
     
   </div>
 </nav>
+              </div>
+              <div class="sidebar-end-items">
+              </div>
             </div>
             
           
@@ -467,10 +495,10 @@
   specific language governing permissions and limitations
   under the License.
 -->
-<div class="section" id="datafusion-specific-functions">
+<section id="datafusion-specific-functions">
 <h1>Datafusion-Specific Functions<a class="headerlink" href="#datafusion-specific-functions" title="Permalink to this headline">¶</a></h1>
 <p>These SQL functions are specific to DataFusion, or they are well known and have functionality which is specific to DataFusion. Specifically, the <code class="docutils literal notranslate"><span class="pre">to_timestamp_xx()</span></code> functions exist due to Arrow’s support for multiple timestamp resolutions.</p>
-<div class="section" id="to-timestamp">
+<section id="to-timestamp">
 <h2><code class="docutils literal notranslate"><span class="pre">to_timestamp</span></code><a class="headerlink" href="#to-timestamp" title="Permalink to this headline">¶</a></h2>
 <p><code class="docutils literal notranslate"><span class="pre">to_timestamp()</span></code> is similar to the standard SQL function. It performs conversions to type <code class="docutils literal notranslate"><span class="pre">Timestamp(Nanoseconds,</span> <span class="pre">None)</span></code>, from:</p>
 <ul class="simple">
@@ -488,8 +516,8 @@ <h2><code class="docutils literal notranslate"><span class="pre">to_timestamp</s
 <li><p>Other Timestamp() columns or values</p></li>
 </ul>
 <p>Note that conversions from other Timestamp and Int64 types can also be performed using <code class="docutils literal notranslate"><span class="pre">CAST(..</span> <span class="pre">AS</span> <span class="pre">Timestamp)</span></code>. However, the conversion functionality here is present for consistency with the other <code class="docutils literal notranslate"><span class="pre">to_timestamp_xx()</span></code> functions.</p>
-</div>
-<div class="section" id="to-timestamp-millis">
+</section>
+<section id="to-timestamp-millis">
 <h2><code class="docutils literal notranslate"><span class="pre">to_timestamp_millis</span></code><a class="headerlink" href="#to-timestamp-millis" title="Permalink to this headline">¶</a></h2>
 <p><code class="docutils literal notranslate"><span class="pre">to_timestamp_millis()</span></code> does conversions to type <code class="docutils literal notranslate"><span class="pre">Timestamp(Milliseconds,</span> <span class="pre">None)</span></code>, from:</p>
 <ul class="simple">
@@ -507,8 +535,8 @@ <h2><code class="docutils literal notranslate"><span class="pre">to_timestamp_mi
 <li><p>Other Timestamp() columns or values</p></li>
 </ul>
 <p>Note that <code class="docutils literal notranslate"><span class="pre">CAST(..</span> <span class="pre">AS</span> <span class="pre">Timestamp)</span></code> converts to Timestamps with Nanosecond resolution; this function is the only way to convert/cast to millisecond resolution.</p>
-</div>
-<div class="section" id="to-timestamp-micros">
+</section>
+<section id="to-timestamp-micros">
 <h2><code class="docutils literal notranslate"><span class="pre">to_timestamp_micros</span></code><a class="headerlink" href="#to-timestamp-micros" title="Permalink to this headline">¶</a></h2>
 <p><code class="docutils literal notranslate"><span class="pre">to_timestamp_micros()</span></code> does conversions to type <code class="docutils literal notranslate"><span class="pre">Timestamp(Microseconds,</span> <span class="pre">None)</span></code>, from:</p>
 <ul class="simple">
@@ -526,8 +554,8 @@ <h2><code class="docutils literal notranslate"><span class="pre">to_timestamp_mi
 <li><p>Other Timestamp() columns or values</p></li>
 </ul>
 <p>Note that <code class="docutils literal notranslate"><span class="pre">CAST(..</span> <span class="pre">AS</span> <span class="pre">Timestamp)</span></code> converts to Timestamps with Nanosecond resolution; this function is the only way to convert/cast to microsecond resolution.</p>
-</div>
-<div class="section" id="to-timestamp-seconds">
+</section>
+<section id="to-timestamp-seconds">
 <h2><code class="docutils literal notranslate"><span class="pre">to_timestamp_seconds</span></code><a class="headerlink" href="#to-timestamp-seconds" title="Permalink to this headline">¶</a></h2>
 <p><code class="docutils literal notranslate"><span class="pre">to_timestamp_seconds()</span></code> does conversions to type <code class="docutils literal notranslate"><span class="pre">Timestamp(Seconds,</span> <span class="pre">None)</span></code>, from:</p>
 <ul class="simple">
@@ -545,19 +573,30 @@ <h2><code class="docutils literal notranslate"><span class="pre">to_timestamp_se
 <li><p>Other Timestamp() columns or values</p></li>
 </ul>
 <p>Note that <code class="docutils literal notranslate"><span class="pre">CAST(..</span> <span class="pre">AS</span> <span class="pre">Timestamp)</span></code> converts to Timestamps with Nanosecond resolution; this function is the only way to convert/cast to seconds resolution.</p>
-</div>
-</div>
+</section>
+</section>
 
 
               </div>
               
               
-              <div class='prev-next-bottom'>
-                
-    <a class='left-prev' id="prev-link" href="ddl.html" title="previous page">DDL</a>
-    <a class='right-next' id="next-link" href="../distributed/index.html" title="next page">Ballista Distributed Compute</a>
-
-              </div>
+              <!-- Previous / next buttons -->
+<div class='prev-next-area'>
+    <a class='left-prev' id="prev-link" href="ddl.html" title="previous page">
+        <i class="fas fa-angle-left"></i>
+        <div class="prev-next-info">
+            <p class="prev-next-subtitle">previous</p>
+            <p class="prev-next-title">DDL</p>
+        </div>
+    </a>
+    <a class='right-next' id="next-link" href="../distributed/index.html" title="next page">
+    <div class="prev-next-info">
+        <p class="prev-next-subtitle">next</p>
+        <p class="prev-next-title">Ballista Distributed Compute</p>
+    </div>
+    <i class="fas fa-angle-right"></i>
+    </a>
+</div>
               
           </main>
           
@@ -565,20 +604,19 @@ <h2><code class="docutils literal notranslate"><span class="pre">to_timestamp_se
       </div>
     </div>
   
-  <script src="../../_static/js/index.1c5a1a01449ed65a7b51.js"></script>
-
+    <script src="../../_static/scripts/pydata-sphinx-theme.js?digest=1999514e3f237ded88cf"></script>
   <footer class="footer mt-5 mt-md-0">
   <div class="container">
     
     <div class="footer-item">
       <p class="copyright">
-    &copy; Copyright 2021, Apache Software Foundation.<br/>
+    &copy; Copyright 2021, Apache Software Foundation.<br>
 </p>
     </div>
     
     <div class="footer-item">
       <p class="sphinx-version">
-Created using <a href="http://sphinx-doc.org/">Sphinx</a> 2.4.4.<br/>
+Created using <a href="http://sphinx-doc.org/">Sphinx</a> 2.4.4.<br>
 </p>
     </div>
     
diff --git a/datafusion/user-guide/sql/ddl.html b/datafusion/user-guide/sql/ddl.html
index 7eed84b92da5..8df3e8ea30b8 100644
--- a/datafusion/user-guide/sql/ddl.html
+++ b/datafusion/user-guide/sql/ddl.html
@@ -3,30 +3,31 @@
 
 <html xmlns="http://www.w3.org/1999/xhtml">
   <head>
-    <meta charset="utf-8" />
+    <meta charset="utf-8" /><meta name="generator" content="Docutils 0.17.1: http://docutils.sourceforge.net/" />
+
     <title>DDL &#8212; Arrow Datafusion  documentation</title>
     
-  <link href="../../_static/css/theme.css" rel="stylesheet" />
-  <link href="../../_static/css/index.c5995385ac14fb8791e8eb36b4908be2.css" rel="stylesheet" />
-
+    <link href="../../_static/styles/theme.css?digest=1999514e3f237ded88cf" rel="stylesheet">
+<link href="../../_static/styles/pydata-sphinx-theme.css?digest=1999514e3f237ded88cf" rel="stylesheet">
+  
     
-  <link rel="stylesheet"
-    href="../../_static/vendor/fontawesome/5.13.0/css/all.min.css">
-  <link rel="preload" as="font" type="font/woff2" crossorigin
-    href="../../_static/vendor/fontawesome/5.13.0/webfonts/fa-solid-900.woff2">
-  <link rel="preload" as="font" type="font/woff2" crossorigin
-    href="../../_static/vendor/fontawesome/5.13.0/webfonts/fa-brands-400.woff2">
-
+    <link rel="stylesheet"
+      href="../../_static/vendor/fontawesome/5.13.0/css/all.min.css">
+    <link rel="preload" as="font" type="font/woff2" crossorigin
+      href="../../_static/vendor/fontawesome/5.13.0/webfonts/fa-solid-900.woff2">
+    <link rel="preload" as="font" type="font/woff2" crossorigin
+      href="../../_static/vendor/fontawesome/5.13.0/webfonts/fa-brands-400.woff2">
+  
     
       
-
+  
     
-    <link rel="stylesheet" href="../../_static/basic.css" type="text/css" />
+    <link rel="stylesheet" href="../../_static/styles/pydata-sphinx-theme.css" type="text/css" />
     <link rel="stylesheet" href="../../_static/pygments.css" type="text/css" />
     <link rel="stylesheet" type="text/css" href="../../_static/theme_overrides.css" />
     
-  <link rel="preload" as="script" href="../../_static/js/index.1c5a1a01449ed65a7b51.js">
-
+    <link rel="preload" as="script" href="../../_static/scripts/pydata-sphinx-theme.js?digest=1999514e3f237ded88cf">
+  
     <script id="documentation_options" data-url_root="../../" src="../../_static/documentation_options.js"></script>
     <script src="../../_static/jquery.js"></script>
     <script src="../../_static/underscore.js"></script>
@@ -37,7 +38,10 @@
     <link rel="next" title="Datafusion-Specific Functions" href="datafusion-functions.html" />
     <link rel="prev" title="SELECT syntax" href="select.html" />
     <meta name="viewport" content="width=device-width, initial-scale=1" />
-    <meta name="docsearch:language" content="en" />
+    <meta name="docsearch:language" content="None">
+    
+
+    <!-- Google Analytics -->
     
   </head>
   <body data-spy="scroll" data-target="#bd-toc-nav" data-offset="80">
@@ -53,6 +57,7 @@
             
             <!-- Only show if we have sidebars configured, else just a small margin  -->
             <div class="col-12 col-md-3 bd-sidebar">
+              <div class="sidebar-start-items">
 <a class="navbar-brand" href="../../index.html">
   <img src="../../_static/images/DataFusion-Logo-Background-White.png" class="logo" alt="logo">
 </a>
@@ -65,7 +70,7 @@
 <nav class="bd-links" id="bd-docs-nav" aria-label="Main navigation">
   <div class="bd-toc-item active">
     
-    <p class="caption">
+    <p>
  <span class="caption-text">
   Supported Environments
  </span>
@@ -174,7 +179,7 @@
   </a>
  </li>
 </ul>
-<p class="caption">
+<p>
  <span class="caption-text">
   User Guide
  </span>
@@ -210,6 +215,11 @@
    </i>
   </label>
   <ul class="current">
+   <li class="toctree-l2">
+    <a class="reference internal" href="sql_status.html">
+     Status
+    </a>
+   </li>
    <li class="toctree-l2">
     <a class="reference internal" href="select.html">
      SELECT syntax
@@ -314,12 +324,17 @@
   </a>
  </li>
 </ul>
-<p class="caption">
+<p>
  <span class="caption-text">
   Specification
  </span>
 </p>
 <ul class="nav bd-sidenav">
+ <li class="toctree-l1">
+  <a class="reference internal" href="../../specification/roadmap.html">
+   Roadmap
+  </a>
+ </li>
  <li class="toctree-l1">
   <a class="reference internal" href="../../specification/invariants.html">
    DataFusion’s Invariants
@@ -330,8 +345,13 @@
    Datafusion output field name semantic
   </a>
  </li>
+ <li class="toctree-l1">
+  <a class="reference internal" href="../../specification/quarterly_roadmap.html">
+   Roadmap
+  </a>
+ </li>
 </ul>
-<p class="caption">
+<p>
  <span class="caption-text">
   README
  </span>
@@ -348,7 +368,7 @@
   </a>
  </li>
 </ul>
-<p class="caption">
+<p>
  <span class="caption-text">
   Community
  </span>
@@ -364,11 +384,19 @@
    Issue tracker
   </a>
  </li>
+ <li class="toctree-l1">
+  <a class="reference external" href="https://github.com/apache/arrow-datafusion/blob/master/CODE_OF_CONDUCT.md">
+   Code of conduct
+  </a>
+ </li>
 </ul>
 
     
   </div>
 </nav>
+              </div>
+              <div class="sidebar-end-items">
+              </div>
             </div>
             
           
@@ -390,6 +418,16 @@
    CREATE EXTERNAL TABLE
   </a>
  </li>
+ <li class="toc-h2 nav-item toc-entry">
+  <a class="reference internal nav-link" href="#create-memory-table">
+   CREATE MEMORY TABLE
+  </a>
+ </li>
+ <li class="toc-h2 nav-item toc-entry">
+  <a class="reference internal nav-link" href="#drop-table">
+   DROP TABLE
+  </a>
+ </li>
 </ul>
 
 </nav>
@@ -436,9 +474,9 @@
   specific language governing permissions and limitations
   under the License.
 -->
-<div class="section" id="ddl">
+<section id="ddl">
 <h1>DDL<a class="headerlink" href="#ddl" title="Permalink to this headline">¶</a></h1>
-<div class="section" id="create-external-table">
+<section id="create-external-table">
 <h2>CREATE EXTERNAL TABLE<a class="headerlink" href="#create-external-table" title="Permalink to this headline">¶</a></h2>
 <p>Parquet data sources can be registered by executing a <code class="docutils literal notranslate"><span class="pre">CREATE</span> <span class="pre">EXTERNAL</span> <span class="pre">TABLE</span></code> SQL statement. It is not necessary
 to provide schema information for Parquet files.</p>
@@ -470,19 +508,54 @@ <h2>CREATE EXTERNAL TABLE<a class="headerlink" href="#create-external-table" tit
 <span class="k">LOCATION</span> <span class="s1">&#39;/path/to/aggregate_test_100.csv&#39;</span><span class="p">;</span>
 </pre></div>
 </div>
+</section>
+<section id="create-memory-table">
+<h2>CREATE MEMORY TABLE<a class="headerlink" href="#create-memory-table" title="Permalink to this headline">¶</a></h2>
+<p>Memory table can be created with query.</p>
+<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="n">CREATE</span> <span class="n">TABLE</span> <span class="n">TABLE_NAME</span> <span class="n">AS</span> <span class="p">[</span><span class="n">SELECT</span> <span class="o">|</span> <span class="n">VALUES</span> <span class="n">LIST</span><span class="p">]</span>
+</pre></div>
+</div>
+<div class="highlight-sql notranslate"><div class="highlight"><pre><span></span><span class="k">CREATE</span> <span class="k">TABLE</span> <span class="n">valuetable</span> <span class="k">AS</span> <span class="k">VALUES</span><span class="p">(</span><span class="mi">1</span><span class="p">,</span><span class="s1">&#39;HELLO&#39;</span><span class="p">),(</span><span class="mi">12</span><span class="p">,</span><span class="s1">&#39;DATAFUSION&#39;</span><span class="p">);</span>
+
+<span class="k">CREATE</span> <span class="k">TABLE</span> <span class="n">memtable</span> <span class="k">as</span> <span class="k">select</span> <span class="o">*</span> <span class="k">from</span> <span class="n">valuetable</span><span class="p">;</span>
+</pre></div>
 </div>
+</section>
+<section id="drop-table">
+<h2>DROP TABLE<a class="headerlink" href="#drop-table" title="Permalink to this headline">¶</a></h2>
+<p>The table can be deleted.</p>
+<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="n">DROP</span> <span class="n">TABLE</span> <span class="p">[</span> <span class="n">IF</span> <span class="n">EXISTS</span> <span class="p">]</span> <span class="n">name</span>
+</pre></div>
 </div>
+<div class="highlight-sql notranslate"><div class="highlight"><pre><span></span><span class="k">CREATE</span> <span class="k">TABLE</span> <span class="n">users</span> <span class="k">AS</span> <span class="k">VALUES</span><span class="p">(</span><span class="mi">1</span><span class="p">,</span><span class="mi">2</span><span class="p">),(</span><span class="mi">2</span><span class="p">,</span><span class="mi">3</span><span class="p">);</span>
+
+<span class="k">DROP</span> <span class="k">TABLE</span> <span class="n">users</span><span class="p">;</span>
+</pre></div>
+</div>
+</section>
+</section>
 
 
               </div>
               
               
-              <div class='prev-next-bottom'>
-                
-    <a class='left-prev' id="prev-link" href="select.html" title="previous page">SELECT syntax</a>
-    <a class='right-next' id="next-link" href="datafusion-functions.html" title="next page">Datafusion-Specific Functions</a>
-
-              </div>
+              <!-- Previous / next buttons -->
+<div class='prev-next-area'>
+    <a class='left-prev' id="prev-link" href="select.html" title="previous page">
+        <i class="fas fa-angle-left"></i>
+        <div class="prev-next-info">
+            <p class="prev-next-subtitle">previous</p>
+            <p class="prev-next-title">SELECT syntax</p>
+        </div>
+    </a>
+    <a class='right-next' id="next-link" href="datafusion-functions.html" title="next page">
+    <div class="prev-next-info">
+        <p class="prev-next-subtitle">next</p>
+        <p class="prev-next-title">Datafusion-Specific Functions</p>
+    </div>
+    <i class="fas fa-angle-right"></i>
+    </a>
+</div>
               
           </main>
           
@@ -490,20 +563,19 @@ <h2>CREATE EXTERNAL TABLE<a class="headerlink" href="#create-external-table" tit
       </div>
     </div>
   
-  <script src="../../_static/js/index.1c5a1a01449ed65a7b51.js"></script>
-
+    <script src="../../_static/scripts/pydata-sphinx-theme.js?digest=1999514e3f237ded88cf"></script>
   <footer class="footer mt-5 mt-md-0">
   <div class="container">
     
     <div class="footer-item">
       <p class="copyright">
-    &copy; Copyright 2021, Apache Software Foundation.<br/>
+    &copy; Copyright 2021, Apache Software Foundation.<br>
 </p>
     </div>
     
     <div class="footer-item">
       <p class="sphinx-version">
-Created using <a href="http://sphinx-doc.org/">Sphinx</a> 2.4.4.<br/>
+Created using <a href="http://sphinx-doc.org/">Sphinx</a> 2.4.4.<br>
 </p>
     </div>
     
diff --git a/datafusion/user-guide/sql/index.html b/datafusion/user-guide/sql/index.html
index f9ee3c5492fc..b8e277605a32 100644
--- a/datafusion/user-guide/sql/index.html
+++ b/datafusion/user-guide/sql/index.html
@@ -3,30 +3,31 @@
 
 <html xmlns="http://www.w3.org/1999/xhtml">
   <head>
-    <meta charset="utf-8" />
+    <meta charset="utf-8" /><meta name="generator" content="Docutils 0.17.1: http://docutils.sourceforge.net/" />
+
     <title>SQL Reference &#8212; Arrow Datafusion  documentation</title>
     
-  <link href="../../_static/css/theme.css" rel="stylesheet" />
-  <link href="../../_static/css/index.c5995385ac14fb8791e8eb36b4908be2.css" rel="stylesheet" />
-
+    <link href="../../_static/styles/theme.css?digest=1999514e3f237ded88cf" rel="stylesheet">
+<link href="../../_static/styles/pydata-sphinx-theme.css?digest=1999514e3f237ded88cf" rel="stylesheet">
+  
     
-  <link rel="stylesheet"
-    href="../../_static/vendor/fontawesome/5.13.0/css/all.min.css">
-  <link rel="preload" as="font" type="font/woff2" crossorigin
-    href="../../_static/vendor/fontawesome/5.13.0/webfonts/fa-solid-900.woff2">
-  <link rel="preload" as="font" type="font/woff2" crossorigin
-    href="../../_static/vendor/fontawesome/5.13.0/webfonts/fa-brands-400.woff2">
-
+    <link rel="stylesheet"
+      href="../../_static/vendor/fontawesome/5.13.0/css/all.min.css">
+    <link rel="preload" as="font" type="font/woff2" crossorigin
+      href="../../_static/vendor/fontawesome/5.13.0/webfonts/fa-solid-900.woff2">
+    <link rel="preload" as="font" type="font/woff2" crossorigin
+      href="../../_static/vendor/fontawesome/5.13.0/webfonts/fa-brands-400.woff2">
+  
     
       
-
+  
     
-    <link rel="stylesheet" href="../../_static/basic.css" type="text/css" />
+    <link rel="stylesheet" href="../../_static/styles/pydata-sphinx-theme.css" type="text/css" />
     <link rel="stylesheet" href="../../_static/pygments.css" type="text/css" />
     <link rel="stylesheet" type="text/css" href="../../_static/theme_overrides.css" />
     
-  <link rel="preload" as="script" href="../../_static/js/index.1c5a1a01449ed65a7b51.js">
-
+    <link rel="preload" as="script" href="../../_static/scripts/pydata-sphinx-theme.js?digest=1999514e3f237ded88cf">
+  
     <script id="documentation_options" data-url_root="../../" src="../../_static/documentation_options.js"></script>
     <script src="../../_static/jquery.js"></script>
     <script src="../../_static/underscore.js"></script>
@@ -34,10 +35,13 @@
     <script src="../../_static/language_data.js"></script>
     <link rel="index" title="Index" href="../../genindex.html" />
     <link rel="search" title="Search" href="../../search.html" />
-    <link rel="next" title="SELECT syntax" href="select.html" />
+    <link rel="next" title="Status" href="sql_status.html" />
     <link rel="prev" title="DataFusion Command-line Interface" href="../cli.html" />
     <meta name="viewport" content="width=device-width, initial-scale=1" />
-    <meta name="docsearch:language" content="en" />
+    <meta name="docsearch:language" content="None">
+    
+
+    <!-- Google Analytics -->
     
   </head>
   <body data-spy="scroll" data-target="#bd-toc-nav" data-offset="80">
@@ -53,6 +57,7 @@
             
             <!-- Only show if we have sidebars configured, else just a small margin  -->
             <div class="col-12 col-md-3 bd-sidebar">
+              <div class="sidebar-start-items">
 <a class="navbar-brand" href="../../index.html">
   <img src="../../_static/images/DataFusion-Logo-Background-White.png" class="logo" alt="logo">
 </a>
@@ -65,7 +70,7 @@
 <nav class="bd-links" id="bd-docs-nav" aria-label="Main navigation">
   <div class="bd-toc-item active">
     
-    <p class="caption">
+    <p>
  <span class="caption-text">
   Supported Environments
  </span>
@@ -174,7 +179,7 @@
   </a>
  </li>
 </ul>
-<p class="caption">
+<p>
  <span class="caption-text">
   User Guide
  </span>
@@ -210,6 +215,11 @@
    </i>
   </label>
   <ul>
+   <li class="toctree-l2">
+    <a class="reference internal" href="sql_status.html">
+     Status
+    </a>
+   </li>
    <li class="toctree-l2">
     <a class="reference internal" href="select.html">
      SELECT syntax
@@ -314,12 +324,17 @@
   </a>
  </li>
 </ul>
-<p class="caption">
+<p>
  <span class="caption-text">
   Specification
  </span>
 </p>
 <ul class="nav bd-sidenav">
+ <li class="toctree-l1">
+  <a class="reference internal" href="../../specification/roadmap.html">
+   Roadmap
+  </a>
+ </li>
  <li class="toctree-l1">
   <a class="reference internal" href="../../specification/invariants.html">
    DataFusion’s Invariants
@@ -330,8 +345,13 @@
    Datafusion output field name semantic
   </a>
  </li>
+ <li class="toctree-l1">
+  <a class="reference internal" href="../../specification/quarterly_roadmap.html">
+   Roadmap
+  </a>
+ </li>
 </ul>
-<p class="caption">
+<p>
  <span class="caption-text">
   README
  </span>
@@ -348,7 +368,7 @@
   </a>
  </li>
 </ul>
-<p class="caption">
+<p>
  <span class="caption-text">
   Community
  </span>
@@ -364,11 +384,19 @@
    Issue tracker
   </a>
  </li>
+ <li class="toctree-l1">
+  <a class="reference external" href="https://github.com/apache/arrow-datafusion/blob/master/CODE_OF_CONDUCT.md">
+   Code of conduct
+  </a>
+ </li>
 </ul>
 
     
   </div>
 </nav>
+              </div>
+              <div class="sidebar-end-items">
+              </div>
             </div>
             
           
@@ -408,10 +436,24 @@
               
               <div>
                 
-  <div class="section" id="sql-reference">
+  <section id="sql-reference">
 <h1>SQL Reference<a class="headerlink" href="#sql-reference" title="Permalink to this headline">¶</a></h1>
 <div class="toctree-wrapper compound">
 <ul>
+<li class="toctree-l1"><a class="reference internal" href="sql_status.html">Status</a><ul>
+<li class="toctree-l2"><a class="reference internal" href="sql_status.html#general">General</a></li>
+<li class="toctree-l2"><a class="reference internal" href="sql_status.html#sql-support">SQL Support</a></li>
+<li class="toctree-l2"><a class="reference internal" href="sql_status.html#data-sources">Data Sources</a></li>
+<li class="toctree-l2"><a class="reference internal" href="sql_status.html#extensibility">Extensibility</a></li>
+<li class="toctree-l2"><a class="reference internal" href="sql_status.html#rust-version-compatbility">Rust Version Compatbility</a></li>
+</ul>
+</li>
+<li class="toctree-l1"><a class="reference internal" href="sql_status.html#supported-sql">Supported SQL</a><ul>
+<li class="toctree-l2"><a class="reference internal" href="sql_status.html#supported-functions">Supported Functions</a></li>
+<li class="toctree-l2"><a class="reference internal" href="sql_status.html#schema-metadata-information-schema-support">Schema Metadata / Information Schema Support</a></li>
+<li class="toctree-l2"><a class="reference internal" href="sql_status.html#supported-data-types">Supported Data Types</a></li>
+</ul>
+</li>
 <li class="toctree-l1"><a class="reference internal" href="select.html">SELECT syntax</a><ul>
 <li class="toctree-l2"><a class="reference internal" href="select.html#with-clause">WITH clause</a></li>
 <li class="toctree-l2"><a class="reference internal" href="select.html#select-clause">SELECT clause</a></li>
@@ -426,6 +468,8 @@ <h1>SQL Reference<a class="headerlink" href="#sql-reference" title="Permalink to
 </li>
 <li class="toctree-l1"><a class="reference internal" href="ddl.html">DDL</a><ul>
 <li class="toctree-l2"><a class="reference internal" href="ddl.html#create-external-table">CREATE EXTERNAL TABLE</a></li>
+<li class="toctree-l2"><a class="reference internal" href="ddl.html#create-memory-table">CREATE MEMORY TABLE</a></li>
+<li class="toctree-l2"><a class="reference internal" href="ddl.html#drop-table">DROP TABLE</a></li>
 </ul>
 </li>
 <li class="toctree-l1"><a class="reference internal" href="datafusion-functions.html">DataFusion Functions</a><ul>
@@ -437,18 +481,29 @@ <h1>SQL Reference<a class="headerlink" href="#sql-reference" title="Permalink to
 </li>
 </ul>
 </div>
-</div>
+</section>
 
 
               </div>
               
               
-              <div class='prev-next-bottom'>
-                
-    <a class='left-prev' id="prev-link" href="../cli.html" title="previous page">DataFusion Command-line Interface</a>
-    <a class='right-next' id="next-link" href="select.html" title="next page">SELECT syntax</a>
-
-              </div>
+              <!-- Previous / next buttons -->
+<div class='prev-next-area'>
+    <a class='left-prev' id="prev-link" href="../cli.html" title="previous page">
+        <i class="fas fa-angle-left"></i>
+        <div class="prev-next-info">
+            <p class="prev-next-subtitle">previous</p>
+            <p class="prev-next-title">DataFusion Command-line Interface</p>
+        </div>
+    </a>
+    <a class='right-next' id="next-link" href="sql_status.html" title="next page">
+    <div class="prev-next-info">
+        <p class="prev-next-subtitle">next</p>
+        <p class="prev-next-title">Status</p>
+    </div>
+    <i class="fas fa-angle-right"></i>
+    </a>
+</div>
               
           </main>
           
@@ -456,20 +511,19 @@ <h1>SQL Reference<a class="headerlink" href="#sql-reference" title="Permalink to
       </div>
     </div>
   
-  <script src="../../_static/js/index.1c5a1a01449ed65a7b51.js"></script>
-
+    <script src="../../_static/scripts/pydata-sphinx-theme.js?digest=1999514e3f237ded88cf"></script>
   <footer class="footer mt-5 mt-md-0">
   <div class="container">
     
     <div class="footer-item">
       <p class="copyright">
-    &copy; Copyright 2021, Apache Software Foundation.<br/>
+    &copy; Copyright 2021, Apache Software Foundation.<br>
 </p>
     </div>
     
     <div class="footer-item">
       <p class="sphinx-version">
-Created using <a href="http://sphinx-doc.org/">Sphinx</a> 2.4.4.<br/>
+Created using <a href="http://sphinx-doc.org/">Sphinx</a> 2.4.4.<br>
 </p>
     </div>
     
diff --git a/datafusion/user-guide/sql/select.html b/datafusion/user-guide/sql/select.html
index e8d25466eaa6..17c6645b73a8 100644
--- a/datafusion/user-guide/sql/select.html
+++ b/datafusion/user-guide/sql/select.html
@@ -3,30 +3,31 @@
 
 <html xmlns="http://www.w3.org/1999/xhtml">
   <head>
-    <meta charset="utf-8" />
+    <meta charset="utf-8" /><meta name="generator" content="Docutils 0.17.1: http://docutils.sourceforge.net/" />
+
     <title>SELECT syntax &#8212; Arrow Datafusion  documentation</title>
     
-  <link href="../../_static/css/theme.css" rel="stylesheet" />
-  <link href="../../_static/css/index.c5995385ac14fb8791e8eb36b4908be2.css" rel="stylesheet" />
-
+    <link href="../../_static/styles/theme.css?digest=1999514e3f237ded88cf" rel="stylesheet">
+<link href="../../_static/styles/pydata-sphinx-theme.css?digest=1999514e3f237ded88cf" rel="stylesheet">
+  
     
-  <link rel="stylesheet"
-    href="../../_static/vendor/fontawesome/5.13.0/css/all.min.css">
-  <link rel="preload" as="font" type="font/woff2" crossorigin
-    href="../../_static/vendor/fontawesome/5.13.0/webfonts/fa-solid-900.woff2">
-  <link rel="preload" as="font" type="font/woff2" crossorigin
-    href="../../_static/vendor/fontawesome/5.13.0/webfonts/fa-brands-400.woff2">
-
+    <link rel="stylesheet"
+      href="../../_static/vendor/fontawesome/5.13.0/css/all.min.css">
+    <link rel="preload" as="font" type="font/woff2" crossorigin
+      href="../../_static/vendor/fontawesome/5.13.0/webfonts/fa-solid-900.woff2">
+    <link rel="preload" as="font" type="font/woff2" crossorigin
+      href="../../_static/vendor/fontawesome/5.13.0/webfonts/fa-brands-400.woff2">
+  
     
       
-
+  
     
-    <link rel="stylesheet" href="../../_static/basic.css" type="text/css" />
+    <link rel="stylesheet" href="../../_static/styles/pydata-sphinx-theme.css" type="text/css" />
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     <link rel="stylesheet" type="text/css" href="../../_static/theme_overrides.css" />
     
-  <link rel="preload" as="script" href="../../_static/js/index.1c5a1a01449ed65a7b51.js">
-
+    <link rel="preload" as="script" href="../../_static/scripts/pydata-sphinx-theme.js?digest=1999514e3f237ded88cf">
+  
     <script id="documentation_options" data-url_root="../../" src="../../_static/documentation_options.js"></script>
     <script src="../../_static/jquery.js"></script>
     <script src="../../_static/underscore.js"></script>
@@ -35,9 +36,12 @@
     <link rel="index" title="Index" href="../../genindex.html" />
     <link rel="search" title="Search" href="../../search.html" />
     <link rel="next" title="DDL" href="ddl.html" />
-    <link rel="prev" title="SQL Reference" href="index.html" />
+    <link rel="prev" title="Status" href="sql_status.html" />
     <meta name="viewport" content="width=device-width, initial-scale=1" />
-    <meta name="docsearch:language" content="en" />
+    <meta name="docsearch:language" content="None">
+    
+
+    <!-- Google Analytics -->
     
   </head>
   <body data-spy="scroll" data-target="#bd-toc-nav" data-offset="80">
@@ -53,6 +57,7 @@
             
             <!-- Only show if we have sidebars configured, else just a small margin  -->
             <div class="col-12 col-md-3 bd-sidebar">
+              <div class="sidebar-start-items">
 <a class="navbar-brand" href="../../index.html">
   <img src="../../_static/images/DataFusion-Logo-Background-White.png" class="logo" alt="logo">
 </a>
@@ -65,7 +70,7 @@
 <nav class="bd-links" id="bd-docs-nav" aria-label="Main navigation">
   <div class="bd-toc-item active">
     
-    <p class="caption">
+    <p>
  <span class="caption-text">
   Supported Environments
  </span>
@@ -174,7 +179,7 @@
   </a>
  </li>
 </ul>
-<p class="caption">
+<p>
  <span class="caption-text">
   User Guide
  </span>
@@ -210,6 +215,11 @@
    </i>
   </label>
   <ul class="current">
+   <li class="toctree-l2">
+    <a class="reference internal" href="sql_status.html">
+     Status
+    </a>
+   </li>
    <li class="toctree-l2 current active">
     <a class="current reference internal" href="#">
      SELECT syntax
@@ -314,12 +324,17 @@
   </a>
  </li>
 </ul>
-<p class="caption">
+<p>
  <span class="caption-text">
   Specification
  </span>
 </p>
 <ul class="nav bd-sidenav">
+ <li class="toctree-l1">
+  <a class="reference internal" href="../../specification/roadmap.html">
+   Roadmap
+  </a>
+ </li>
  <li class="toctree-l1">
   <a class="reference internal" href="../../specification/invariants.html">
    DataFusion’s Invariants
@@ -330,8 +345,13 @@
    Datafusion output field name semantic
   </a>
  </li>
+ <li class="toctree-l1">
+  <a class="reference internal" href="../../specification/quarterly_roadmap.html">
+   Roadmap
+  </a>
+ </li>
 </ul>
-<p class="caption">
+<p>
  <span class="caption-text">
   README
  </span>
@@ -348,7 +368,7 @@
   </a>
  </li>
 </ul>
-<p class="caption">
+<p>
  <span class="caption-text">
   Community
  </span>
@@ -364,11 +384,19 @@
    Issue tracker
   </a>
  </li>
+ <li class="toctree-l1">
+  <a class="reference external" href="https://github.com/apache/arrow-datafusion/blob/master/CODE_OF_CONDUCT.md">
+   Code of conduct
+  </a>
+ </li>
 </ul>
 
     
   </div>
 </nav>
+              </div>
+              <div class="sidebar-end-items">
+              </div>
             </div>
             
           
@@ -476,7 +504,7 @@
   specific language governing permissions and limitations
   under the License.
 -->
-<div class="section" id="select-syntax">
+<section id="select-syntax">
 <h1>SELECT syntax<a class="headerlink" href="#select-syntax" title="Permalink to this headline">¶</a></h1>
 <p>The queries in DataFusion scan data from tables and return 0 or more rows.
 In this documentation we describe the SQL syntax in DataFusion.</p>
@@ -492,15 +520,15 @@ <h1>SELECT syntax<a class="headerlink" href="#select-syntax" title="Permalink to
 [ <a class="reference external" href="#order-by-clause">ORDER BY</a> expression [ ASC | DESC ][, …] ] <br/>
 [ <a class="reference external" href="#limit-clause">LIMIT</a> count ] <br/></p>
 </code>
-<div class="section" id="with-clause">
+<section id="with-clause">
 <h2>WITH clause<a class="headerlink" href="#with-clause" title="Permalink to this headline">¶</a></h2>
 <p>A with clause allows to give names for queries and reference them by name.</p>
 <div class="highlight-sql notranslate"><div class="highlight"><pre><span></span><span class="k">WITH</span> <span class="n">x</span> <span class="k">AS</span> <span class="p">(</span><span class="k">SELECT</span> <span class="n">a</span><span class="p">,</span> <span class="k">MAX</span><span class="p">(</span><span class="n">b</span><span class="p">)</span> <span class="k">AS</span> <span class="n">b</span> <span class="k">FROM</span> <span class="n">t</span> <span class="k">GROUP</span> <span class="k">BY</span> <span class="n">a</span><span class="p">)</span>
 <span class="k">SELECT</span> <span class="n">a</span><span class="p">,</span> <span class="n">b</span> <span class="k">FROM</span> <span class="n">x</span><span class="p">;</span>
 </pre></div>
 </div>
-</div>
-<div class="section" id="select-clause">
+</section>
+<section id="select-clause">
 <h2>SELECT clause<a class="headerlink" href="#select-clause" title="Permalink to this headline">¶</a></h2>
 <p>Example:</p>
 <div class="highlight-sql notranslate"><div class="highlight"><pre><span></span><span class="k">SELECT</span> <span class="n">a</span><span class="p">,</span> <span class="n">b</span><span class="p">,</span> <span class="n">a</span> <span class="o">+</span> <span class="n">b</span> <span class="k">FROM</span> <span class="k">table</span>
@@ -511,36 +539,36 @@ <h2>SELECT clause<a class="headerlink" href="#select-clause" title="Permalink to
 <div class="highlight-sql notranslate"><div class="highlight"><pre><span></span><span class="k">SELECT</span> <span class="k">DISTINCT</span> <span class="n">person</span><span class="p">,</span> <span class="n">age</span> <span class="k">FROM</span> <span class="n">employees</span>
 </pre></div>
 </div>
-</div>
-<div class="section" id="from-clause">
+</section>
+<section id="from-clause">
 <h2>FROM clause<a class="headerlink" href="#from-clause" title="Permalink to this headline">¶</a></h2>
 <p>Example:</p>
 <div class="highlight-sql notranslate"><div class="highlight"><pre><span></span><span class="k">SELECT</span> <span class="n">t</span><span class="p">.</span><span class="n">a</span> <span class="k">FROM</span> <span class="k">table</span> <span class="k">AS</span> <span class="n">t</span>
 </pre></div>
 </div>
-</div>
-<div class="section" id="where-clause">
+</section>
+<section id="where-clause">
 <h2>WHERE clause<a class="headerlink" href="#where-clause" title="Permalink to this headline">¶</a></h2>
 <p>Example:</p>
 <div class="highlight-sql notranslate"><div class="highlight"><pre><span></span><span class="k">SELECT</span> <span class="n">a</span> <span class="k">FROM</span> <span class="k">table</span> <span class="k">WHERE</span> <span class="n">a</span> <span class="o">&gt;</span> <span class="mi">10</span>
 </pre></div>
 </div>
-</div>
-<div class="section" id="group-by-clause">
+</section>
+<section id="group-by-clause">
 <h2>GROUP BY clause<a class="headerlink" href="#group-by-clause" title="Permalink to this headline">¶</a></h2>
 <p>Example:</p>
 <div class="highlight-sql notranslate"><div class="highlight"><pre><span></span><span class="k">SELECT</span> <span class="n">a</span><span class="p">,</span> <span class="n">b</span><span class="p">,</span> <span class="k">MAX</span><span class="p">(</span><span class="k">c</span><span class="p">)</span> <span class="k">FROM</span> <span class="k">table</span> <span class="k">GROUP</span> <span class="k">BY</span> <span class="n">a</span><span class="p">,</span> <span class="n">b</span>
 </pre></div>
 </div>
-</div>
-<div class="section" id="having-clause">
+</section>
+<section id="having-clause">
 <h2>HAVING clause<a class="headerlink" href="#having-clause" title="Permalink to this headline">¶</a></h2>
 <p>Example:</p>
 <div class="highlight-sql notranslate"><div class="highlight"><pre><span></span><span class="k">SELECT</span> <span class="n">a</span><span class="p">,</span> <span class="n">b</span><span class="p">,</span> <span class="k">MAX</span><span class="p">(</span><span class="k">c</span><span class="p">)</span> <span class="k">FROM</span> <span class="k">table</span> <span class="k">GROUP</span> <span class="k">BY</span> <span class="n">a</span><span class="p">,</span> <span class="n">b</span> <span class="k">HAVING</span> <span class="k">MAX</span><span class="p">(</span><span class="k">c</span><span class="p">)</span> <span class="o">&gt;</span> <span class="mi">10</span>
 </pre></div>
 </div>
-</div>
-<div class="section" id="union-clause">
+</section>
+<section id="union-clause">
 <h2>UNION clause<a class="headerlink" href="#union-clause" title="Permalink to this headline">¶</a></h2>
 <p>Example:</p>
 <div class="highlight-sql notranslate"><div class="highlight"><pre><span></span><span class="k">SELECT</span>
@@ -556,8 +584,8 @@ <h2>UNION clause<a class="headerlink" href="#union-clause" title="Permalink to t
 <span class="k">FROM</span> <span class="n">table2</span>
 </pre></div>
 </div>
-</div>
-<div class="section" id="order-by-clause">
+</section>
+<section id="order-by-clause">
 <h2>ORDER BY clause<a class="headerlink" href="#order-by-clause" title="Permalink to this headline">¶</a></h2>
 <p>Orders the results by the referenced expression. By default it uses ascending order (<code class="docutils literal notranslate"><span class="pre">ASC</span></code>).
 This order can be changed to descending by adding <code class="docutils literal notranslate"><span class="pre">DESC</span></code> after the order-by expressions.</p>
@@ -567,8 +595,8 @@ <h2>ORDER BY clause<a class="headerlink" href="#order-by-clause" title="Permalin
 <span class="k">SELECT</span> <span class="n">age</span><span class="p">,</span> <span class="n">person</span> <span class="k">FROM</span> <span class="k">table</span> <span class="k">ORDER</span> <span class="k">BY</span> <span class="n">age</span><span class="p">,</span> <span class="n">person</span> <span class="k">DESC</span><span class="p">;</span>
 </pre></div>
 </div>
-</div>
-<div class="section" id="limit-clause">
+</section>
+<section id="limit-clause">
 <h2>LIMIT clause<a class="headerlink" href="#limit-clause" title="Permalink to this headline">¶</a></h2>
 <p>Limits the number of rows to be a maximum of <code class="docutils literal notranslate"><span class="pre">count</span></code> rows. <code class="docutils literal notranslate"><span class="pre">count</span></code> should be a non-negative integer.</p>
 <p>Example:</p>
@@ -576,19 +604,30 @@ <h2>LIMIT clause<a class="headerlink" href="#limit-clause" title="Permalink to t
 <span class="k">LIMIT</span> <span class="mi">10</span>
 </pre></div>
 </div>
-</div>
-</div>
+</section>
+</section>
 
 
               </div>
               
               
-              <div class='prev-next-bottom'>
-                
-    <a class='left-prev' id="prev-link" href="index.html" title="previous page">SQL Reference</a>
-    <a class='right-next' id="next-link" href="ddl.html" title="next page">DDL</a>
-
-              </div>
+              <!-- Previous / next buttons -->
+<div class='prev-next-area'>
+    <a class='left-prev' id="prev-link" href="sql_status.html" title="previous page">
+        <i class="fas fa-angle-left"></i>
+        <div class="prev-next-info">
+            <p class="prev-next-subtitle">previous</p>
+            <p class="prev-next-title">Status</p>
+        </div>
+    </a>
+    <a class='right-next' id="next-link" href="ddl.html" title="next page">
+    <div class="prev-next-info">
+        <p class="prev-next-subtitle">next</p>
+        <p class="prev-next-title">DDL</p>
+    </div>
+    <i class="fas fa-angle-right"></i>
+    </a>
+</div>
               
           </main>
           
@@ -596,20 +635,19 @@ <h2>LIMIT clause<a class="headerlink" href="#limit-clause" title="Permalink to t
       </div>
     </div>
   
-  <script src="../../_static/js/index.1c5a1a01449ed65a7b51.js"></script>
-
+    <script src="../../_static/scripts/pydata-sphinx-theme.js?digest=1999514e3f237ded88cf"></script>
   <footer class="footer mt-5 mt-md-0">
   <div class="container">
     
     <div class="footer-item">
       <p class="copyright">
-    &copy; Copyright 2021, Apache Software Foundation.<br/>
+    &copy; Copyright 2021, Apache Software Foundation.<br>
 </p>
     </div>
     
     <div class="footer-item">
       <p class="sphinx-version">
-Created using <a href="http://sphinx-doc.org/">Sphinx</a> 2.4.4.<br/>
+Created using <a href="http://sphinx-doc.org/">Sphinx</a> 2.4.4.<br>
 </p>
     </div>
     
diff --git a/datafusion/user-guide/sql/sql_status.html b/datafusion/user-guide/sql/sql_status.html
new file mode 100644
index 000000000000..af6d87dac2dc
--- /dev/null
+++ b/datafusion/user-guide/sql/sql_status.html
@@ -0,0 +1,872 @@
+
+<!DOCTYPE html>
+
+<html xmlns="http://www.w3.org/1999/xhtml">
+  <head>
+    <meta charset="utf-8" /><meta name="generator" content="Docutils 0.17.1: http://docutils.sourceforge.net/" />
+
+    <title>Status &#8212; Arrow Datafusion  documentation</title>
+    
+    <link href="../../_static/styles/theme.css?digest=1999514e3f237ded88cf" rel="stylesheet">
+<link href="../../_static/styles/pydata-sphinx-theme.css?digest=1999514e3f237ded88cf" rel="stylesheet">
+  
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+     <li class="toctree-l3 has-children">
+      <a class="reference internal" href="../../python/api/functions.html">
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+         datafusion.functions
+        </a>
+       </li>
+      </ul>
+     </li>
+    </ul>
+   </li>
+  </ul>
+ </li>
+ <li class="toctree-l1">
+  <a class="reference internal" href="../../cli/index.html">
+   Command line
+  </a>
+ </li>
+</ul>
+<p>
+ <span class="caption-text">
+  User Guide
+ </span>
+</p>
+<ul class="current nav bd-sidenav">
+ <li class="toctree-l1">
+  <a class="reference internal" href="../introduction.html">
+   Introduction
+  </a>
+ </li>
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+  <a class="reference internal" href="../example-usage.html">
+   Example Usage
+  </a>
+ </li>
+ <li class="toctree-l1">
+  <a class="reference internal" href="../library.html">
+   Using DataFusion as a library
+  </a>
+ </li>
+ <li class="toctree-l1">
+  <a class="reference internal" href="../cli.html">
+   DataFusion Command-line Interface
+  </a>
+ </li>
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+   SQL Reference
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+   <li class="toctree-l2">
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+     DDL
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+     DataFusion Functions
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+ </li>
+ <li class="toctree-l1 has-children">
+  <a class="reference internal" href="../distributed/index.html">
+   Ballista Distributed Compute
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+    <a class="reference internal" href="../distributed/introduction.html">
+     Overview
+    </a>
+   </li>
+   <li class="toctree-l2 has-children">
+    <a class="reference internal" href="../distributed/deployment/index.html">
+     Start a Ballista Cluster
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+     <li class="toctree-l3">
+      <a class="reference internal" href="../distributed/deployment/cargo-install.html">
+       Deploying a standalone Ballista cluster using cargo install
+      </a>
+     </li>
+     <li class="toctree-l3">
+      <a class="reference internal" href="../distributed/deployment/docker.html">
+       Starting a Ballista cluster using Docker
+      </a>
+     </li>
+     <li class="toctree-l3">
+      <a class="reference internal" href="../distributed/deployment/docker-compose.html">
+       Starting a Ballista cluster using Docker Compose
+      </a>
+     </li>
+     <li class="toctree-l3">
+      <a class="reference internal" href="../distributed/deployment/kubernetes.html">
+       Deploying Ballista with Kubernetes
+      </a>
+     </li>
+     <li class="toctree-l3">
+      <a class="reference internal" href="../distributed/deployment/raspberrypi.html">
+       Running Ballista on Raspberry Pi
+      </a>
+     </li>
+     <li class="toctree-l3">
+      <a class="reference internal" href="../distributed/deployment/configuration.html">
+       Configuration
+      </a>
+     </li>
+    </ul>
+   </li>
+   <li class="toctree-l2 has-children">
+    <a class="reference internal" href="../distributed/clients/index.html">
+     Clients
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+     <li class="toctree-l3">
+      <a class="reference internal" href="../distributed/clients/rust.html">
+       Ballista Rust Client
+      </a>
+     </li>
+     <li class="toctree-l3">
+      <a class="reference internal" href="../distributed/clients/python.html">
+       Python
+      </a>
+     </li>
+    </ul>
+   </li>
+  </ul>
+ </li>
+ <li class="toctree-l1">
+  <a class="reference internal" href="../faq.html">
+   Frequently Asked Questions
+  </a>
+ </li>
+</ul>
+<p>
+ <span class="caption-text">
+  Specification
+ </span>
+</p>
+<ul class="nav bd-sidenav">
+ <li class="toctree-l1">
+  <a class="reference internal" href="../../specification/roadmap.html">
+   Roadmap
+  </a>
+ </li>
+ <li class="toctree-l1">
+  <a class="reference internal" href="../../specification/invariants.html">
+   DataFusion’s Invariants
+  </a>
+ </li>
+ <li class="toctree-l1">
+  <a class="reference internal" href="../../specification/output-field-name-semantic.html">
+   Datafusion output field name semantic
+  </a>
+ </li>
+ <li class="toctree-l1">
+  <a class="reference internal" href="../../specification/quarterly_roadmap.html">
+   Roadmap
+  </a>
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+<p>
+ <span class="caption-text">
+  README
+ </span>
+</p>
+<ul class="nav bd-sidenav">
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+  <a class="reference external" href="https://github.com/apache/arrow-datafusion/blob/master/README.md">
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+ <li class="toctree-l1">
+  <a class="reference external" href="https://github.com/apache/arrow-datafusion/tree/master/ballista/README.md">
+   Ballista
+  </a>
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+  Community
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+   Issue tracker
+  </a>
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+  <a class="reference external" href="https://github.com/apache/arrow-datafusion/blob/master/CODE_OF_CONDUCT.md">
+   Code of conduct
+  </a>
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+     General
+    </a>
+   </li>
+   <li class="toc-h2 nav-item toc-entry">
+    <a class="reference internal nav-link" href="#sql-support">
+     SQL Support
+    </a>
+   </li>
+   <li class="toc-h2 nav-item toc-entry">
+    <a class="reference internal nav-link" href="#data-sources">
+     Data Sources
+    </a>
+   </li>
+   <li class="toc-h2 nav-item toc-entry">
+    <a class="reference internal nav-link" href="#extensibility">
+     Extensibility
+    </a>
+   </li>
+   <li class="toc-h2 nav-item toc-entry">
+    <a class="reference internal nav-link" href="#rust-version-compatbility">
+     Rust Version Compatbility
+    </a>
+   </li>
+  </ul>
+ </li>
+ <li class="toc-h1 nav-item toc-entry">
+  <a class="reference internal nav-link" href="#supported-sql">
+   Supported SQL
+  </a>
+  <ul class="visible nav section-nav flex-column">
+   <li class="toc-h2 nav-item toc-entry">
+    <a class="reference internal nav-link" href="#supported-functions">
+     Supported Functions
+    </a>
+   </li>
+   <li class="toc-h2 nav-item toc-entry">
+    <a class="reference internal nav-link" href="#schema-metadata-information-schema-support">
+     Schema Metadata / Information Schema Support
+    </a>
+   </li>
+   <li class="toc-h2 nav-item toc-entry">
+    <a class="reference internal nav-link" href="#supported-data-types">
+     Supported Data Types
+    </a>
+   </li>
+  </ul>
+ </li>
+</ul>
+
+</nav>
+              </div>
+              
+              <div class="toc-item">
+                
+
+<div class="tocsection editthispage">
+    <a href="https://github.com/apache/arrow-datafusion/edit/master/docs/source/user-guide/sql/sql_status.md">
+        <i class="fas fa-pencil-alt"></i> Edit this page
+    </a>
+</div>
+
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+              
+            
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+          
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+          
+            
+          
+          <main class="col-12 col-md-9 col-xl-7 py-md-5 pl-md-5 pr-md-4 bd-content" role="main">
+              
+              <div>
+                
+  <!---
+  Licensed to the Apache Software Foundation (ASF) under one
+  or more contributor license agreements.  See the NOTICE file
+  distributed with this work for additional information
+  regarding copyright ownership.  The ASF licenses this file
+  to you under the Apache License, Version 2.0 (the
+  "License"); you may not use this file except in compliance
+  with the License.  You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+  Unless required by applicable law or agreed to in writing,
+  software distributed under the License is distributed on an
+  "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  KIND, either express or implied.  See the License for the
+  specific language governing permissions and limitations
+  under the License.
+-->
+<section id="status">
+<h1>Status<a class="headerlink" href="#status" title="Permalink to this headline">¶</a></h1>
+<section id="general">
+<h2>General<a class="headerlink" href="#general" title="Permalink to this headline">¶</a></h2>
+<ul class="simple">
+<li><p>[x] SQL Parser</p></li>
+<li><p>[x] SQL Query Planner</p></li>
+<li><p>[x] Query Optimizer</p></li>
+<li><p>[x] Constant folding</p></li>
+<li><p>[x] Join Reordering</p></li>
+<li><p>[x] Limit Pushdown</p></li>
+<li><p>[x] Projection push down</p></li>
+<li><p>[x] Predicate push down</p></li>
+<li><p>[x] Type coercion</p></li>
+<li><p>[x] Parallel query execution</p></li>
+</ul>
+</section>
+<section id="sql-support">
+<h2>SQL Support<a class="headerlink" href="#sql-support" title="Permalink to this headline">¶</a></h2>
+<ul class="simple">
+<li><p>[x] Projection</p></li>
+<li><p>[x] Filter (WHERE)</p></li>
+<li><p>[x] Filter post-aggregate (HAVING)</p></li>
+<li><p>[x] Limit</p></li>
+<li><p>[x] Aggregate</p></li>
+<li><p>[x] Common math functions</p></li>
+<li><p>[x] cast</p></li>
+<li><p>[x] try_cast</p></li>
+<li><p>[x] <a class="reference external" href="https://www.postgresql.org/docs/current/queries-values.html"><code class="docutils literal notranslate"><span class="pre">VALUES</span></code> lists</a></p></li>
+<li><p>Postgres compatible String functions</p>
+<ul>
+<li><p>[x] ascii</p></li>
+<li><p>[x] bit_length</p></li>
+<li><p>[x] btrim</p></li>
+<li><p>[x] char_length</p></li>
+<li><p>[x] character_length</p></li>
+<li><p>[x] chr</p></li>
+<li><p>[x] concat</p></li>
+<li><p>[x] concat_ws</p></li>
+<li><p>[x] initcap</p></li>
+<li><p>[x] left</p></li>
+<li><p>[x] length</p></li>
+<li><p>[x] lpad</p></li>
+<li><p>[x] ltrim</p></li>
+<li><p>[x] octet_length</p></li>
+<li><p>[x] regexp_replace</p></li>
+<li><p>[x] repeat</p></li>
+<li><p>[x] replace</p></li>
+<li><p>[x] reverse</p></li>
+<li><p>[x] right</p></li>
+<li><p>[x] rpad</p></li>
+<li><p>[x] rtrim</p></li>
+<li><p>[x] split_part</p></li>
+<li><p>[x] starts_with</p></li>
+<li><p>[x] strpos</p></li>
+<li><p>[x] substr</p></li>
+<li><p>[x] to_hex</p></li>
+<li><p>[x] translate</p></li>
+<li><p>[x] trim</p></li>
+</ul>
+</li>
+<li><p>Miscellaneous/Boolean functions</p>
+<ul>
+<li><p>[x] nullif</p></li>
+</ul>
+</li>
+<li><p>Approximation functions</p>
+<ul>
+<li><p>[x] approx_distinct</p></li>
+</ul>
+</li>
+<li><p>Common date/time functions</p>
+<ul>
+<li><p>[ ] Basic date functions</p></li>
+<li><p>[ ] Basic time functions</p></li>
+<li><p>[x] Basic timestamp functions</p>
+<ul>
+<li><p>[x] <a class="reference external" href="docs/user-guide/book/sql/datafusion-functions.html#to_timestamp">to_timestamp</a></p></li>
+<li><p>[x] <a class="reference external" href="docs/user-guide/book/sql/datafusion-functions.html#to_timestamp_millis">to_timestamp_millis</a></p></li>
+<li><p>[x] <a class="reference external" href="docs/user-guide/book/sql/datafusion-functions.html#to_timestamp_micros">to_timestamp_micros</a></p></li>
+<li><p>[x] <a class="reference external" href="docs/user-guide/book/sql/datafusion-functions.html#to_timestamp_seconds">to_timestamp_seconds</a></p></li>
+</ul>
+</li>
+</ul>
+</li>
+<li><p>nested functions</p>
+<ul>
+<li><p>[x] Array of columns</p></li>
+</ul>
+</li>
+<li><p>[x] Schema Queries</p>
+<ul>
+<li><p>[x] SHOW TABLES</p></li>
+<li><p>[x] SHOW COLUMNS</p></li>
+<li><p>[x] information_schema.{tables, columns}</p></li>
+<li><p>[ ] information_schema other views</p></li>
+</ul>
+</li>
+<li><p>[x] Sorting</p></li>
+<li><p>[ ] Nested types</p></li>
+<li><p>[ ] Lists</p></li>
+<li><p>[x] Subqueries</p></li>
+<li><p>[x] Common table expressions</p></li>
+<li><p>[x] Set Operations</p>
+<ul>
+<li><p>[x] UNION ALL</p></li>
+<li><p>[x] UNION</p></li>
+<li><p>[x] INTERSECT</p></li>
+<li><p>[x] INTERSECT ALL</p></li>
+<li><p>[x] EXCEPT</p></li>
+<li><p>[x] EXCEPT ALL</p></li>
+</ul>
+</li>
+<li><p>[x] Joins</p>
+<ul>
+<li><p>[x] INNER JOIN</p></li>
+<li><p>[x] LEFT JOIN</p></li>
+<li><p>[x] RIGHT JOIN</p></li>
+<li><p>[x] FULL JOIN</p></li>
+<li><p>[x] CROSS JOIN</p></li>
+</ul>
+</li>
+<li><p>[ ] Window</p>
+<ul>
+<li><p>[x] Empty window</p></li>
+<li><p>[x] Common window functions</p></li>
+<li><p>[x] Window with PARTITION BY clause</p></li>
+<li><p>[x] Window with ORDER BY clause</p></li>
+<li><p>[ ] Window with FILTER clause</p></li>
+<li><p>[ ] <a class="reference external" href="https://github.com/apache/arrow-datafusion/issues/361">Window with custom WINDOW FRAME</a></p></li>
+<li><p>[ ] UDF and UDAF for window functions</p></li>
+</ul>
+</li>
+</ul>
+</section>
+<section id="data-sources">
+<h2>Data Sources<a class="headerlink" href="#data-sources" title="Permalink to this headline">¶</a></h2>
+<ul class="simple">
+<li><p>[x] CSV</p></li>
+<li><p>[x] Parquet primitive types</p></li>
+<li><p>[ ] Parquet nested types</p></li>
+</ul>
+</section>
+<section id="extensibility">
+<h2>Extensibility<a class="headerlink" href="#extensibility" title="Permalink to this headline">¶</a></h2>
+<p>DataFusion is designed to be extensible at all points. To that end, you can provide your own custom:</p>
+<ul class="simple">
+<li><p>[x] User Defined Functions (UDFs)</p></li>
+<li><p>[x] User Defined Aggregate Functions (UDAFs)</p></li>
+<li><p>[x] User Defined Table Source (<code class="docutils literal notranslate"><span class="pre">TableProvider</span></code>) for tables</p></li>
+<li><p>[x] User Defined <code class="docutils literal notranslate"><span class="pre">Optimizer</span></code> passes (plan rewrites)</p></li>
+<li><p>[x] User Defined <code class="docutils literal notranslate"><span class="pre">LogicalPlan</span></code> nodes</p></li>
+<li><p>[x] User Defined <code class="docutils literal notranslate"><span class="pre">ExecutionPlan</span></code> nodes</p></li>
+</ul>
+</section>
+<section id="rust-version-compatbility">
+<h2>Rust Version Compatbility<a class="headerlink" href="#rust-version-compatbility" title="Permalink to this headline">¶</a></h2>
+<p>This crate is tested with the latest stable version of Rust. We do not currently test against other, older versions of the Rust compiler.</p>
+</section>
+</section>
+<section id="supported-sql">
+<h1>Supported SQL<a class="headerlink" href="#supported-sql" title="Permalink to this headline">¶</a></h1>
+<p>This library currently supports many SQL constructs, including</p>
+<ul class="simple">
+<li><p><code class="docutils literal notranslate"><span class="pre">CREATE</span> <span class="pre">EXTERNAL</span> <span class="pre">TABLE</span> <span class="pre">X</span> <span class="pre">STORED</span> <span class="pre">AS</span> <span class="pre">PARQUET</span> <span class="pre">LOCATION</span> <span class="pre">'...';</span></code> to register a table’s locations</p></li>
+<li><p><code class="docutils literal notranslate"><span class="pre">SELECT</span> <span class="pre">...</span> <span class="pre">FROM</span> <span class="pre">...</span></code> together with any expression</p></li>
+<li><p><code class="docutils literal notranslate"><span class="pre">ALIAS</span></code> to name an expression</p></li>
+<li><p><code class="docutils literal notranslate"><span class="pre">CAST</span></code> to change types, including e.g. <code class="docutils literal notranslate"><span class="pre">Timestamp(Nanosecond,</span> <span class="pre">None)</span></code></p></li>
+<li><p>Many mathematical unary and binary expressions such as <code class="docutils literal notranslate"><span class="pre">+</span></code>, <code class="docutils literal notranslate"><span class="pre">/</span></code>, <code class="docutils literal notranslate"><span class="pre">sqrt</span></code>, <code class="docutils literal notranslate"><span class="pre">tan</span></code>, <code class="docutils literal notranslate"><span class="pre">&gt;=</span></code>.</p></li>
+<li><p><code class="docutils literal notranslate"><span class="pre">WHERE</span></code> to filter</p></li>
+<li><p><code class="docutils literal notranslate"><span class="pre">GROUP</span> <span class="pre">BY</span></code> together with one of the following aggregations: <code class="docutils literal notranslate"><span class="pre">MIN</span></code>, <code class="docutils literal notranslate"><span class="pre">MAX</span></code>, <code class="docutils literal notranslate"><span class="pre">COUNT</span></code>, <code class="docutils literal notranslate"><span class="pre">SUM</span></code>, <code class="docutils literal notranslate"><span class="pre">AVG</span></code>, <code class="docutils literal notranslate"><span class="pre">CORR</span></code>, <code class="docutils literal notranslate"><span class="pre">VAR</span></code>, <code class="docutils literal notranslate"><span class="pre">COVAR</span></code>, <code class="docutils literal notranslate"><span class="pre">STDDEV</span></code> (sample and population)</p></li>
+<li><p><code class="docutils literal notranslate"><span class="pre">ORDER</span> <span class="pre">BY</span></code> together with an expression and optional <code class="docutils literal notranslate"><span class="pre">ASC</span></code> or <code class="docutils literal notranslate"><span class="pre">DESC</span></code> and also optional <code class="docutils literal notranslate"><span class="pre">NULLS</span> <span class="pre">FIRST</span></code> or <code class="docutils literal notranslate"><span class="pre">NULLS</span> <span class="pre">LAST</span></code></p></li>
+</ul>
+<section id="supported-functions">
+<h2>Supported Functions<a class="headerlink" href="#supported-functions" title="Permalink to this headline">¶</a></h2>
+<p>DataFusion strives to implement a subset of the <a class="reference external" href="https://www.postgresql.org/docs/current/functions.html">PostgreSQL SQL dialect</a> where possible. We explicitly choose a single dialect to maximize interoperability with other tools and allow reuse of the PostgreSQL documents and tutorials as much as possible.</p>
+<p>Currently, only a subset of the PostgreSQL dialect is implemented, and we will document any deviations.</p>
+</section>
+<section id="schema-metadata-information-schema-support">
+<h2>Schema Metadata / Information Schema Support<a class="headerlink" href="#schema-metadata-information-schema-support" title="Permalink to this headline">¶</a></h2>
+<p>DataFusion supports the showing metadata about the tables available. This information can be accessed using the views of the ISO SQL <code class="docutils literal notranslate"><span class="pre">information_schema</span></code> schema or the DataFusion specific <code class="docutils literal notranslate"><span class="pre">SHOW</span> <span class="pre">TABLES</span></code> and <code class="docutils literal notranslate"><span class="pre">SHOW</span> <span class="pre">COLUMNS</span></code> commands.</p>
+<p>More information can be found in the <a class="reference external" href="https://www.postgresql.org/docs/13/infoschema-schema.html">Postgres docs</a>).</p>
+<p>To show tables available for use in DataFusion, use the <code class="docutils literal notranslate"><span class="pre">SHOW</span> <span class="pre">TABLES</span></code> command or the <code class="docutils literal notranslate"><span class="pre">information_schema.tables</span></code> view:</p>
+<div class="highlight-sql notranslate"><div class="highlight"><pre><span></span><span class="o">&gt;</span> <span class="k">show</span> <span class="n">tables</span><span class="p">;</span>
+<span class="o">+</span><span class="c1">---------------+--------------------+------------+------------+</span>
+<span class="o">|</span> <span class="n">table_catalog</span> <span class="o">|</span> <span class="n">table_schema</span>       <span class="o">|</span> <span class="k">table_name</span> <span class="o">|</span> <span class="n">table_type</span> <span class="o">|</span>
+<span class="o">+</span><span class="c1">---------------+--------------------+------------+------------+</span>
+<span class="o">|</span> <span class="n">datafusion</span>    <span class="o">|</span> <span class="k">public</span>             <span class="o">|</span> <span class="n">t</span>          <span class="o">|</span> <span class="n">BASE</span> <span class="k">TABLE</span> <span class="o">|</span>
+<span class="o">|</span> <span class="n">datafusion</span>    <span class="o">|</span> <span class="n">information_schema</span> <span class="o">|</span> <span class="n">tables</span>     <span class="o">|</span> <span class="k">VIEW</span>       <span class="o">|</span>
+<span class="o">+</span><span class="c1">---------------+--------------------+------------+------------+</span>
+
+<span class="o">&gt;</span> <span class="k">select</span> <span class="o">*</span> <span class="k">from</span> <span class="n">information_schema</span><span class="p">.</span><span class="n">tables</span><span class="p">;</span>
+
+<span class="o">+</span><span class="c1">---------------+--------------------+------------+--------------+</span>
+<span class="o">|</span> <span class="n">table_catalog</span> <span class="o">|</span> <span class="n">table_schema</span>       <span class="o">|</span> <span class="k">table_name</span> <span class="o">|</span> <span class="n">table_type</span>   <span class="o">|</span>
+<span class="o">+</span><span class="c1">---------------+--------------------+------------+--------------+</span>
+<span class="o">|</span> <span class="n">datafusion</span>    <span class="o">|</span> <span class="k">public</span>             <span class="o">|</span> <span class="n">t</span>          <span class="o">|</span> <span class="n">BASE</span> <span class="k">TABLE</span>   <span class="o">|</span>
+<span class="o">|</span> <span class="n">datafusion</span>    <span class="o">|</span> <span class="n">information_schema</span> <span class="o">|</span> <span class="n">TABLES</span>     <span class="o">|</span> <span class="k">SYSTEM</span> <span class="k">TABLE</span> <span class="o">|</span>
+<span class="o">+</span><span class="c1">---------------+--------------------+------------+--------------+</span>
+</pre></div>
+</div>
+<p>To show the schema of a table in DataFusion, use the <code class="docutils literal notranslate"><span class="pre">SHOW</span> <span class="pre">COLUMNS</span></code> command or the or <code class="docutils literal notranslate"><span class="pre">information_schema.columns</span></code> view:</p>
+<div class="highlight-sql notranslate"><div class="highlight"><pre><span></span><span class="o">&gt;</span> <span class="k">show</span> <span class="n">columns</span> <span class="k">from</span> <span class="n">t</span><span class="p">;</span>
+<span class="o">+</span><span class="c1">---------------+--------------+------------+-------------+-----------+-------------+</span>
+<span class="o">|</span> <span class="n">table_catalog</span> <span class="o">|</span> <span class="n">table_schema</span> <span class="o">|</span> <span class="k">table_name</span> <span class="o">|</span> <span class="k">column_name</span> <span class="o">|</span> <span class="n">data_type</span> <span class="o">|</span> <span class="n">is_nullable</span> <span class="o">|</span>
+<span class="o">+</span><span class="c1">---------------+--------------+------------+-------------+-----------+-------------+</span>
+<span class="o">|</span> <span class="n">datafusion</span>    <span class="o">|</span> <span class="k">public</span>       <span class="o">|</span> <span class="n">t</span>          <span class="o">|</span> <span class="n">a</span>           <span class="o">|</span> <span class="n">Int32</span>     <span class="o">|</span> <span class="k">NO</span>          <span class="o">|</span>
+<span class="o">|</span> <span class="n">datafusion</span>    <span class="o">|</span> <span class="k">public</span>       <span class="o">|</span> <span class="n">t</span>          <span class="o">|</span> <span class="n">b</span>           <span class="o">|</span> <span class="n">Utf8</span>      <span class="o">|</span> <span class="k">NO</span>          <span class="o">|</span>
+<span class="o">|</span> <span class="n">datafusion</span>    <span class="o">|</span> <span class="k">public</span>       <span class="o">|</span> <span class="n">t</span>          <span class="o">|</span> <span class="k">c</span>           <span class="o">|</span> <span class="n">Float32</span>   <span class="o">|</span> <span class="k">NO</span>          <span class="o">|</span>
+<span class="o">+</span><span class="c1">---------------+--------------+------------+-------------+-----------+-------------+</span>
+
+<span class="o">&gt;</span>   <span class="k">select</span> <span class="k">table_name</span><span class="p">,</span> <span class="k">column_name</span><span class="p">,</span> <span class="n">ordinal_position</span><span class="p">,</span> <span class="n">is_nullable</span><span class="p">,</span> <span class="n">data_type</span> <span class="k">from</span> <span class="n">information_schema</span><span class="p">.</span><span class="n">columns</span><span class="p">;</span>
+<span class="o">+</span><span class="c1">------------+-------------+------------------+-------------+-----------+</span>
+<span class="o">|</span> <span class="k">table_name</span> <span class="o">|</span> <span class="k">column_name</span> <span class="o">|</span> <span class="n">ordinal_position</span> <span class="o">|</span> <span class="n">is_nullable</span> <span class="o">|</span> <span class="n">data_type</span> <span class="o">|</span>
+<span class="o">+</span><span class="c1">------------+-------------+------------------+-------------+-----------+</span>
+<span class="o">|</span> <span class="n">t</span>          <span class="o">|</span> <span class="n">a</span>           <span class="o">|</span> <span class="mi">0</span>                <span class="o">|</span> <span class="k">NO</span>          <span class="o">|</span> <span class="n">Int32</span>     <span class="o">|</span>
+<span class="o">|</span> <span class="n">t</span>          <span class="o">|</span> <span class="n">b</span>           <span class="o">|</span> <span class="mi">1</span>                <span class="o">|</span> <span class="k">NO</span>          <span class="o">|</span> <span class="n">Utf8</span>      <span class="o">|</span>
+<span class="o">|</span> <span class="n">t</span>          <span class="o">|</span> <span class="k">c</span>           <span class="o">|</span> <span class="mi">2</span>                <span class="o">|</span> <span class="k">NO</span>          <span class="o">|</span> <span class="n">Float32</span>   <span class="o">|</span>
+<span class="o">+</span><span class="c1">------------+-------------+------------------+-------------+-----------+</span>
+</pre></div>
+</div>
+</section>
+<section id="supported-data-types">
+<h2>Supported Data Types<a class="headerlink" href="#supported-data-types" title="Permalink to this headline">¶</a></h2>
+<p>DataFusion uses Arrow, and thus the Arrow type system, for query
+execution. The SQL types from
+<a class="reference external" href="https://github.com/ballista-compute/sqlparser-rs/blob/main/src/ast/data_type.rs#L57">sqlparser-rs</a>
+are mapped to Arrow types according to the following table</p>
+<table class="colwidths-auto table">
+<thead>
+<tr class="row-odd"><th class="head"><p>SQL Data Type</p></th>
+<th class="head"><p>Arrow DataType</p></th>
+</tr>
+</thead>
+<tbody>
+<tr class="row-even"><td><p><code class="docutils literal notranslate"><span class="pre">CHAR</span></code></p></td>
+<td><p><code class="docutils literal notranslate"><span class="pre">Utf8</span></code></p></td>
+</tr>
+<tr class="row-odd"><td><p><code class="docutils literal notranslate"><span class="pre">VARCHAR</span></code></p></td>
+<td><p><code class="docutils literal notranslate"><span class="pre">Utf8</span></code></p></td>
+</tr>
+<tr class="row-even"><td><p><code class="docutils literal notranslate"><span class="pre">UUID</span></code></p></td>
+<td><p><em>Not yet supported</em></p></td>
+</tr>
+<tr class="row-odd"><td><p><code class="docutils literal notranslate"><span class="pre">CLOB</span></code></p></td>
+<td><p><em>Not yet supported</em></p></td>
+</tr>
+<tr class="row-even"><td><p><code class="docutils literal notranslate"><span class="pre">BINARY</span></code></p></td>
+<td><p><em>Not yet supported</em></p></td>
+</tr>
+<tr class="row-odd"><td><p><code class="docutils literal notranslate"><span class="pre">VARBINARY</span></code></p></td>
+<td><p><em>Not yet supported</em></p></td>
+</tr>
+<tr class="row-even"><td><p><code class="docutils literal notranslate"><span class="pre">DECIMAL</span></code></p></td>
+<td><p><code class="docutils literal notranslate"><span class="pre">Float64</span></code></p></td>
+</tr>
+<tr class="row-odd"><td><p><code class="docutils literal notranslate"><span class="pre">FLOAT</span></code></p></td>
+<td><p><code class="docutils literal notranslate"><span class="pre">Float32</span></code></p></td>
+</tr>
+<tr class="row-even"><td><p><code class="docutils literal notranslate"><span class="pre">SMALLINT</span></code></p></td>
+<td><p><code class="docutils literal notranslate"><span class="pre">Int16</span></code></p></td>
+</tr>
+<tr class="row-odd"><td><p><code class="docutils literal notranslate"><span class="pre">INT</span></code></p></td>
+<td><p><code class="docutils literal notranslate"><span class="pre">Int32</span></code></p></td>
+</tr>
+<tr class="row-even"><td><p><code class="docutils literal notranslate"><span class="pre">BIGINT</span></code></p></td>
+<td><p><code class="docutils literal notranslate"><span class="pre">Int64</span></code></p></td>
+</tr>
+<tr class="row-odd"><td><p><code class="docutils literal notranslate"><span class="pre">REAL</span></code></p></td>
+<td><p><code class="docutils literal notranslate"><span class="pre">Float32</span></code></p></td>
+</tr>
+<tr class="row-even"><td><p><code class="docutils literal notranslate"><span class="pre">DOUBLE</span></code></p></td>
+<td><p><code class="docutils literal notranslate"><span class="pre">Float64</span></code></p></td>
+</tr>
+<tr class="row-odd"><td><p><code class="docutils literal notranslate"><span class="pre">BOOLEAN</span></code></p></td>
+<td><p><code class="docutils literal notranslate"><span class="pre">Boolean</span></code></p></td>
+</tr>
+<tr class="row-even"><td><p><code class="docutils literal notranslate"><span class="pre">DATE</span></code></p></td>
+<td><p><code class="docutils literal notranslate"><span class="pre">Date32</span></code></p></td>
+</tr>
+<tr class="row-odd"><td><p><code class="docutils literal notranslate"><span class="pre">TIME</span></code></p></td>
+<td><p><code class="docutils literal notranslate"><span class="pre">Time64(TimeUnit::Millisecond)</span></code></p></td>
+</tr>
+<tr class="row-even"><td><p><code class="docutils literal notranslate"><span class="pre">TIMESTAMP</span></code></p></td>
+<td><p><code class="docutils literal notranslate"><span class="pre">Timestamp(TimeUnit::Nanosecond)</span></code></p></td>
+</tr>
+<tr class="row-odd"><td><p><code class="docutils literal notranslate"><span class="pre">INTERVAL</span></code></p></td>
+<td><p><em>Not yet supported</em></p></td>
+</tr>
+<tr class="row-even"><td><p><code class="docutils literal notranslate"><span class="pre">REGCLASS</span></code></p></td>
+<td><p><em>Not yet supported</em></p></td>
+</tr>
+<tr class="row-odd"><td><p><code class="docutils literal notranslate"><span class="pre">TEXT</span></code></p></td>
+<td><p><em>Not yet supported</em></p></td>
+</tr>
+<tr class="row-even"><td><p><code class="docutils literal notranslate"><span class="pre">BYTEA</span></code></p></td>
+<td><p><em>Not yet supported</em></p></td>
+</tr>
+<tr class="row-odd"><td><p><code class="docutils literal notranslate"><span class="pre">CUSTOM</span></code></p></td>
+<td><p><em>Not yet supported</em></p></td>
+</tr>
+<tr class="row-even"><td><p><code class="docutils literal notranslate"><span class="pre">ARRAY</span></code></p></td>
+<td><p><em>Not yet supported</em></p></td>
+</tr>
+</tbody>
+</table>
+</section>
+</section>
+
+
+              </div>
+              
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