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[SPARK-28809][DOC][SQL]Document SHOW TABLE in SQL Reference #25632

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added doc for "show table extended" sql command.
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162 changes: 159 additions & 3 deletions docs/sql-ref-syntax-aux-show-table.md
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---
layout: global
title: SHOW TABLE
displayTitle: SHOW TABLE
title: SHOW TABLE EXTENDED
displayTitle: SHOW TABLE EXTENDED
license: |
Licensed to the Apache Software Foundation (ASF) under one or more
contributor license agreements. See the NOTICE file distributed with
Expand All @@ -18,5 +18,161 @@ license: |
See the License for the specific language governing permissions and
limitations under the License.
---
### Description

**This page is under construction**
`SHOW TABLE EXTENDED` will show information for all tables matching the given regular expression.
Output includes basic table information and file system information like `Last Access`,
`Created By`, `Type`, `Provider`, `Table Properties`, `Location`, `Serde Library`, `InputFormat`,
`OutputFormat`, `Storage Properties`, `Partition Provider`, `Partition Columns` and `Schema`.

If a partition specification is present, it outputs the given partition's file-system-specific
information such as `Partition Parameters` and `Partition Statistics`. Note that a table regex
cannot be used with a partition specification.

### Syntax
{% highlight sql %}
SHOW TABLE EXTENDED [IN|FROM database_name] LIKE 'identifier_with_wildcards' [PARTITION(partition_spec)];
{% endhighlight %}

### Parameters
<dl>
<dt><code><em>IN|FROM database_name</em></code></dt>
<dd>
Specifies database name. If not provided, will use the current database.
</dd>
<dt><code><em>LIKE string_pattern</em></code></dt>
<dd>
Specifies the regular expression pattern that is used to filter out unwanted tables.
<ul>
<li> Except for `*` and `|` character, the pattern works like a regex.</li>
<li> `*` alone matches 0 or more characters and `|` is used to separate multiple different regexes,
any of which can match. </li>
<li> The leading and trailing blanks are trimmed in the input pattern before processing.</li>
</ul>
</dd>
<dt><code><em>PARTITION(partition_spec)</em></code></dt>
<dd>
Specifies partition column and its value which is exists in the table. Note that a table regex
cannot be used with a partition specification..
</dd>
</dl>
### Examples
{% highlight sql %}
-- Assumes `employee` table created with partitioned by column `grade`
-- +-------+--------+--+
-- | name | grade |
-- +-------+--------+--+
-- | sam | 1 |
-- | suj | 2 |
-- +-------+--------+--+

-- Show the details of the table
SHOW TABLE EXTENDED LIKE `employee`;
+--------+---------+-----------+---------------------------------------------------------------
|database|tableName|isTemporary| information
+--------+---------+-----------+---------------------------------------------------------------
|default |employee |false |Database: default
Table: employee
Owner: root
Created Time: Fri Aug 30 15:10:21 IST 2019
Last Access: Thu Jan 01 05:30:00 IST 1970
Created By: Spark 3.0.0-SNAPSHOT
Type: MANAGED
Provider: hive
Table Properties: [transient_lastDdlTime=1567158021]
Location: file:/opt/spark1/spark/spark-warehouse/employee
Serde Library: org.apache.hadoop.hive.serde2.lazy
.LazySimpleSerDe
InputFormat: org.apache.hadoop.mapred.TextInputFormat
OutputFormat: org.apache.hadoop.hive.ql.io
.HiveIgnoreKeyTextOutputFormat
Storage Properties: [serialization.format=1]
Partition Provider: Catalog
Partition Columns: [`grade`]
Schema: root
|-- name: string (nullable = true)
|-- grade: integer (nullable = true)

+--------+---------+-----------+---------------------------------------------------------------

-- showing the multiple table details with pattern matching
SHOW TABLE EXTENDED LIKE `employe*`;
+--------+---------+-----------+---------------------------------------------------------------
|database|tableName|isTemporary| information
+--------+---------+-----------+---------------------------------------------------------------
|default |employee |false |Database: default
Table: employee
Owner: root
Created Time: Fri Aug 30 15:10:21 IST 2019
Last Access: Thu Jan 01 05:30:00 IST 1970
Created By: Spark 3.0.0-SNAPSHOT
Type: MANAGED
Provider: hive
Table Properties: [transient_lastDdlTime=1567158021]
Location: file:/opt/spark1/spark/spark-warehouse/employee
Serde Library: org.apache.hadoop.hive.serde2.lazy
.LazySimpleSerDe
InputFormat: org.apache.hadoop.mapred.TextInputFormat
OutputFormat: org.apache.hadoop.hive.ql.io
.HiveIgnoreKeyTextOutputFormat
Storage Properties: [serialization.format=1]
Partition Provider: Catalog
Partition Columns: [`grade`]
Schema: root
|-- name: string (nullable = true)
|-- grade: integer (nullable = true)

|default |employee1|false |Database: default
Table: employee1
Owner: root
Created Time: Fri Aug 30 15:22:33 IST 2019
Last Access: Thu Jan 01 05:30:00 IST 1970
Created By: Spark 3.0.0-SNAPSHOT
Type: MANAGED
Provider: hive
Table Properties: [transient_lastDdlTime=1567158753]
Location: file:/opt/spark1/spark/spark-warehouse/employee1
Serde Library: org.apache.hadoop.hive.serde2.lazy
.LazySimpleSerDe
InputFormat: org.apache.hadoop.mapred.TextInputFormat
OutputFormat: org.apache.hadoop.hive.ql.io
.HiveIgnoreKeyTextOutputFormat
Storage Properties: [serialization.format=1]
Partition Provider: Catalog
Schema: root
|-- name: string (nullable = true)

+--------+---------+----------+----------------------------------------------------------------

-- show partition file system details
SHOW TABLE EXTENDED IN `default` LIKE `employee` PARTITION (`grade=1`);
+--------+---------+-----------+---------------------------------------------------------------
|database|tableName|isTemporary| information
+--------+---------+-----------+---------------------------------------------------------------
|default |employee |false | Partition Values: [grade=1]
Location: file:/opt/spark1/spark/spark-warehouse/employee
/grade=1
Serde Library: org.apache.hadoop.hive.serde2.lazy
.LazySimpleSerDe
InputFormat: org.apache.hadoop.mapred.TextInputFormat
OutputFormat: org.apache.hadoop.hive.ql.io
.HiveIgnoreKeyTextOutputFormat
Storage Properties: [serialization.format=1]
Partition Parameters: {rawDataSize=-1, numFiles=1,
transient_lastDdlTime=1567158221, totalSize=4,
COLUMN_STATS_ACCURATE=false, numRows=-1}
Created Time: Fri Aug 30 15:13:41 IST 2019
Last Access: Thu Jan 01 05:30:00 IST 1970
Partition Statistics: 4 bytes
|
+--------+---------+-----------+---------------------------------------------------------------

-- show partition file system details with regex fails as shown below
SHOW TABLE EXTENDED IN `default` LIKE `empl*` PARTITION (`grade=1`);
Error: Error running query: org.apache.spark.sql.catalyst.analysis.NoSuchTableException:
Table or view 'emplo*' not found in database 'default'; (state=,code=0)

{% endhighlight %}
### Related Statements
- [CREATE TABLE](sql-ref-syntax-ddl-create-table.html)
- [DESCRIBE TABLE](sql-ref-syntax-aux-describe-table.html)