Add release page

Change-Id: I5aaf1215347b3fe76561bb43f1fe10fb96126197

Author: wesm

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+layout: default
+title: Apache Arrow 0.5.0 Release
+permalink: /release/0.5.0.html
+---
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+Licensed to the Apache Software Foundation (ASF) under one or more
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+
+# Apache Arrow 0.5.0 (23 July 2017)
+
+This is a major release, with expanded features in the supported languages and
+additional integration test coverage between Java and C++.
+
+Read more in the [release blog post][8].
+
+## Download
+
+* [**Source Artifacts**][6]
+* [Git tag][2]
+
+## Contributors
+
+```shell
+$ git shortlog -sn apache-arrow-0.4.1..apache-arrow-0.5.0
+    42  Wes McKinney
+    22  Uwe L. Korn
+    12  Kouhei Sutou
+     9  Max Risuhin
+     9  Phillip Cloud
+     6  Philipp Moritz
+     5  Steven Phillips
+     3  Julien Le Dem
+     2  Bryan Cutler
+     2  Kengo Seki
+     2  Max Risukhin
+     2  fjetter
+     1  Antony Mayi
+     1  Deepak Majeti
+     1  Fang Zheng
+     1  Hideo Hattori
+     1  Holden Karau
+     1  Itai Incze
+     1  Jeff Knupp
+     1  LynnYuan
+     1  Mark Lavrynenko
+     1  Michael König
+     1  Robert Nishihara
+     1  Sudheesh Katkam
+     1  Zahari
+     1  vkorukanti
+```
+
+# Changelog
+
+## New Features and Improvements
+
+* [ARROW-1041](https://issues.apache.org/jira/browse/ARROW-1041) - [Python] Support read_pandas on a directory of Parquet files
+* [ARROW-1048](https://issues.apache.org/jira/browse/ARROW-1048) - Allow user LD_LIBRARY_PATH to be used with source release script
+* [ARROW-1052](https://issues.apache.org/jira/browse/ARROW-1052) - Arrow 0.5.0 release
+* [ARROW-1073](https://issues.apache.org/jira/browse/ARROW-1073) - C++: Adapative integer builder
+* [ARROW-1095](https://issues.apache.org/jira/browse/ARROW-1095) - [Website] Add Arrow icon asset
+* [ARROW-1100](https://issues.apache.org/jira/browse/ARROW-1100) - [Python] Add "mode" property to NativeFile instances
+* [ARROW-1102](https://issues.apache.org/jira/browse/ARROW-1102) - Make MessageSerializer.serializeMessage() public
+* [ARROW-111](https://issues.apache.org/jira/browse/ARROW-111) - [C++] Add static analyzer to tool chain to verify checking of Status returns
+* [ARROW-1120](https://issues.apache.org/jira/browse/ARROW-1120) - [Python] Write support for int96
+* [ARROW-1122](https://issues.apache.org/jira/browse/ARROW-1122) - [Website] Guest blog post on Arrow + ODBC from turbodbc
+* [ARROW-1123](https://issues.apache.org/jira/browse/ARROW-1123) - C++: Make jemalloc the default allocator
+* [ARROW-1135](https://issues.apache.org/jira/browse/ARROW-1135) - Upgrade Travis CI clang builds to use LLVM 4.0
+* [ARROW-1137](https://issues.apache.org/jira/browse/ARROW-1137) - Python: Ensure Pandas roundtrip of all-None column
+* [ARROW-1142](https://issues.apache.org/jira/browse/ARROW-1142) - [C++] Move over compression library toolchain from parquet-cpp
+* [ARROW-1145](https://issues.apache.org/jira/browse/ARROW-1145) - [GLib] Add get_values()
+* [ARROW-1146](https://issues.apache.org/jira/browse/ARROW-1146) - Add .gitignore for *_generated.h files in src/plasma/format
+* [ARROW-1148](https://issues.apache.org/jira/browse/ARROW-1148) - [C++] Raise minimum CMake version to 3.2
+* [ARROW-1151](https://issues.apache.org/jira/browse/ARROW-1151) - [C++] Add gcc branch prediction to status check macro
+* [ARROW-1154](https://issues.apache.org/jira/browse/ARROW-1154) - [C++] Migrate more computational utility code from parquet-cpp
+* [ARROW-1160](https://issues.apache.org/jira/browse/ARROW-1160) - C++: Implement DictionaryBuilder
+* [ARROW-1165](https://issues.apache.org/jira/browse/ARROW-1165) - [C++] Refactor PythonDecimalToArrowDecimal to not use templates
+* [ARROW-1172](https://issues.apache.org/jira/browse/ARROW-1172) - [C++] Use unique_ptr with array builder classes
+* [ARROW-1183](https://issues.apache.org/jira/browse/ARROW-1183) - [Python] Implement time type conversions in to_pandas
+* [ARROW-1185](https://issues.apache.org/jira/browse/ARROW-1185) - [C++] Clean up arrow::Status implementation, add warn_unused_result attribute for clang
+* [ARROW-1187](https://issues.apache.org/jira/browse/ARROW-1187) - Serialize a DataFrame with None column
+* [ARROW-1193](https://issues.apache.org/jira/browse/ARROW-1193) - [C++] Support pkg-config forarrow_python.so
+* [ARROW-1196](https://issues.apache.org/jira/browse/ARROW-1196) - [C++] Appveyor separate jobs for Debug/Release builds from sources; Build with conda toolchain; Build with NMake Makefiles Generator
+* [ARROW-1198](https://issues.apache.org/jira/browse/ARROW-1198) - Python: Add public C++ API to unwrap PyArrow object
+* [ARROW-1199](https://issues.apache.org/jira/browse/ARROW-1199) - [C++] Introduce mutable POD struct for generic array data
+* [ARROW-1202](https://issues.apache.org/jira/browse/ARROW-1202) - Remove semicolons from status macros
+* [ARROW-1212](https://issues.apache.org/jira/browse/ARROW-1212) - [GLib] Add garrow_binary_array_get_offsets_buffer()
+* [ARROW-1214](https://issues.apache.org/jira/browse/ARROW-1214) - [Python] Add classes / functions to enable stream message components to be handled outside of the stream reader class
+* [ARROW-1217](https://issues.apache.org/jira/browse/ARROW-1217) - [GLib] Add GInputStream based arrow::io::RandomAccessFile
+* [ARROW-1220](https://issues.apache.org/jira/browse/ARROW-1220) - [C++] Standartize usage of *_HOME cmake script variables for 3rd party libs
+* [ARROW-1221](https://issues.apache.org/jira/browse/ARROW-1221) - [C++] Pin clang-format version
+* [ARROW-1227](https://issues.apache.org/jira/browse/ARROW-1227) - [GLib] Support GOutputStream
+* [ARROW-1228](https://issues.apache.org/jira/browse/ARROW-1228) - [GLib] Test file name should be the same name as target class
+* [ARROW-1229](https://issues.apache.org/jira/browse/ARROW-1229) - [GLib] Follow Reader API change (get -> read)
+* [ARROW-1233](https://issues.apache.org/jira/browse/ARROW-1233) - [C++] Validate cmake script resolving of 3rd party linked libs from correct location in toolchain build
+* [ARROW-460](https://issues.apache.org/jira/browse/ARROW-460) - [C++] Implement JSON round trip for DictionaryArray
+* [ARROW-462](https://issues.apache.org/jira/browse/ARROW-462) - [C++] Implement in-memory conversions between non-nested primitive types and DictionaryArray equivalent
+* [ARROW-575](https://issues.apache.org/jira/browse/ARROW-575) - Python: Auto-detect nested lists and nested numpy arrays in Pandas
+* [ARROW-597](https://issues.apache.org/jira/browse/ARROW-597) - [Python] Add convenience function to yield DataFrame from any object that a StreamReader or FileReader can read from
+* [ARROW-599](https://issues.apache.org/jira/browse/ARROW-599) - [C++] Add LZ4 codec to 3rd-party toolchain
+* [ARROW-600](https://issues.apache.org/jira/browse/ARROW-600) - [C++] Add ZSTD codec to 3rd-party toolchain
+* [ARROW-692](https://issues.apache.org/jira/browse/ARROW-692) - Java<->C++ Integration tests for dictionary-encoded vectors
+* [ARROW-693](https://issues.apache.org/jira/browse/ARROW-693) - [Java] Add JSON support for dictionary vectors
+* [ARROW-742](https://issues.apache.org/jira/browse/ARROW-742) - Handling exceptions during execution of std::wstring_convert
+* [ARROW-834](https://issues.apache.org/jira/browse/ARROW-834) - [Python] Support creating Arrow arrays from Python iterables
+* [ARROW-915](https://issues.apache.org/jira/browse/ARROW-915) - Struct Array reads limited support
+* [ARROW-935](https://issues.apache.org/jira/browse/ARROW-935) - [Java] Build Javadoc in Travis CI
+* [ARROW-960](https://issues.apache.org/jira/browse/ARROW-960) - [Python] Add source build guide for macOS + Homebrew
+* [ARROW-962](https://issues.apache.org/jira/browse/ARROW-962) - [Python] Add schema attribute to FileReader
+* [ARROW-966](https://issues.apache.org/jira/browse/ARROW-966) - [Python] pyarrow.list_ should also accept Field instance
+* [ARROW-978](https://issues.apache.org/jira/browse/ARROW-978) - [Python] Use sphinx-bootstrap-theme for Sphinx documentation
+
+## Bug Fixes
+
+* [ARROW-1074](https://issues.apache.org/jira/browse/ARROW-1074) - from_pandas doesnt convert ndarray to list
+* [ARROW-1079](https://issues.apache.org/jira/browse/ARROW-1079) - [Python] Empty "private" directories should be ignored by Parquet interface
+* [ARROW-1081](https://issues.apache.org/jira/browse/ARROW-1081) - C++: arrow::test::TestBase::MakePrimitive doesn't fill null_bitmap
+* [ARROW-1096](https://issues.apache.org/jira/browse/ARROW-1096) - [C++] Memory mapping file over 4GB fails on Windows
+* [ARROW-1097](https://issues.apache.org/jira/browse/ARROW-1097) - Reading tensor needs file to be opened in writeable mode
+* [ARROW-1098](https://issues.apache.org/jira/browse/ARROW-1098) - Document Error?
+* [ARROW-1101](https://issues.apache.org/jira/browse/ARROW-1101) - UnionListWriter is not implementing all methods on interface ScalarWriter
+* [ARROW-1103](https://issues.apache.org/jira/browse/ARROW-1103) - [Python] Utilize pandas metadata from common _metadata Parquet file if it exists
+* [ARROW-1107](https://issues.apache.org/jira/browse/ARROW-1107) - [JAVA] NullableMapVector getField() should return nullable type
+* [ARROW-1108](https://issues.apache.org/jira/browse/ARROW-1108) - Check if ArrowBuf is empty buffer in getActualConsumedMemory() and getPossibleConsumedMemory()
+* [ARROW-1109](https://issues.apache.org/jira/browse/ARROW-1109) - [JAVA] transferOwnership fails when readerIndex is not 0
+* [ARROW-1110](https://issues.apache.org/jira/browse/ARROW-1110) - [JAVA] make union vector naming consistent
+* [ARROW-1111](https://issues.apache.org/jira/browse/ARROW-1111) - [JAVA] Make aligning buffers optional, and allow -1 for unknown null count
+* [ARROW-1112](https://issues.apache.org/jira/browse/ARROW-1112) - [JAVA] Set lastSet for VarLength and List vectors when loading
+* [ARROW-1113](https://issues.apache.org/jira/browse/ARROW-1113) - [C++] gflags EP build gets triggered (as a no-op) on subsequent calls to make or ninja build
+* [ARROW-1115](https://issues.apache.org/jira/browse/ARROW-1115) - [C++] Use absolute path for ccache
+* [ARROW-1117](https://issues.apache.org/jira/browse/ARROW-1117) - [Docs] Minor issues in GLib README
+* [ARROW-1124](https://issues.apache.org/jira/browse/ARROW-1124) - [Python] pyarrow needs to depend on numpy>=1.10 (not 1.9)
+* [ARROW-1125](https://issues.apache.org/jira/browse/ARROW-1125) - Python: Table.from_pandas doesn't work anymore on partial schemas
+* [ARROW-1128](https://issues.apache.org/jira/browse/ARROW-1128) - [Docs] command to build a wheel is not properly rendered
+* [ARROW-1129](https://issues.apache.org/jira/browse/ARROW-1129) - [C++] Fix Linux toolchain build regression from ARROW-742
+* [ARROW-1131](https://issues.apache.org/jira/browse/ARROW-1131) - Python: Parquet unit tests are always skipped
+* [ARROW-1132](https://issues.apache.org/jira/browse/ARROW-1132) - [Python] Unable to write pandas DataFrame w/MultiIndex containing duplicate values to parquet
+* [ARROW-1136](https://issues.apache.org/jira/browse/ARROW-1136) - [C++/Python] Segfault on empty stream
+* [ARROW-1138](https://issues.apache.org/jira/browse/ARROW-1138) - Travis: Use OpenJDK7 instead of OracleJDK7
+* [ARROW-1139](https://issues.apache.org/jira/browse/ARROW-1139) - [C++] dlmalloc doesn't allow arrow to be built with clang 4 or gcc 7.1.1
+* [ARROW-1141](https://issues.apache.org/jira/browse/ARROW-1141) - on import get libjemalloc.so.2: cannot allocate memory in static TLS block
+* [ARROW-1143](https://issues.apache.org/jira/browse/ARROW-1143) - C++: Fix comparison of NullArray
+* [ARROW-1144](https://issues.apache.org/jira/browse/ARROW-1144) - [C++] Remove unused variable
+* [ARROW-1147](https://issues.apache.org/jira/browse/ARROW-1147) - [C++] Allow optional vendoring of flatbuffers in plasma
+* [ARROW-1150](https://issues.apache.org/jira/browse/ARROW-1150) - [C++] AdaptiveIntBuilder compiler warning on MSVC
+* [ARROW-1152](https://issues.apache.org/jira/browse/ARROW-1152) - [Cython] read_tensor should work with a readable file
+* [ARROW-1155](https://issues.apache.org/jira/browse/ARROW-1155) - segmentation fault when run pa.Int16Value()
+* [ARROW-1157](https://issues.apache.org/jira/browse/ARROW-1157) - C++/Python: Decimal templates are not correctly exported on OSX
+* [ARROW-1159](https://issues.apache.org/jira/browse/ARROW-1159) - [C++] Static data members cannot be accessed from inline functions in Arrow headers by thirdparty users
+* [ARROW-1162](https://issues.apache.org/jira/browse/ARROW-1162) - Transfer Between Empty Lists Should Not Invoke Callback
+* [ARROW-1166](https://issues.apache.org/jira/browse/ARROW-1166) - Errors in Struct type's example and missing reference in Layout.md
+* [ARROW-1167](https://issues.apache.org/jira/browse/ARROW-1167) - [Python] Create chunked BinaryArray in Table.from_pandas when a column's data exceeds 2GB
+* [ARROW-1168](https://issues.apache.org/jira/browse/ARROW-1168) - [Python] pandas metadata may contain "mixed" data types
+* [ARROW-1169](https://issues.apache.org/jira/browse/ARROW-1169) - C++: jemalloc externalproject doesn't build with CMake's ninja generator
+* [ARROW-1170](https://issues.apache.org/jira/browse/ARROW-1170) - C++: ARROW_JEMALLOC=OFF breaks linking on unittest
+* [ARROW-1174](https://issues.apache.org/jira/browse/ARROW-1174) - [GLib] Investigate root cause of ListArray glib test failure
+* [ARROW-1177](https://issues.apache.org/jira/browse/ARROW-1177) - [C++] Detect int32 overflow in ListBuilder::Append
+* [ARROW-1179](https://issues.apache.org/jira/browse/ARROW-1179) - C++: Add missing virtual destructors
+* [ARROW-1180](https://issues.apache.org/jira/browse/ARROW-1180) - [GLib] garrow_tensor_get_dimension_name() returns invalid address
+* [ARROW-1181](https://issues.apache.org/jira/browse/ARROW-1181) - [Python] Parquet test fail if not enabled
+* [ARROW-1182](https://issues.apache.org/jira/browse/ARROW-1182) - C++: Specify BUILD_BYPRODUCTS for zlib and zstd
+* [ARROW-1186](https://issues.apache.org/jira/browse/ARROW-1186) - [C++] Enable option to build arrow with minimal dependencies needed to build Parquet library
+* [ARROW-1188](https://issues.apache.org/jira/browse/ARROW-1188) - Segfault when trying to serialize a DataFrame with Null-only Categorical Column
+* [ARROW-1190](https://issues.apache.org/jira/browse/ARROW-1190) - VectorLoader corrupts vectors with duplicate names
+* [ARROW-1191](https://issues.apache.org/jira/browse/ARROW-1191) - [JAVA] Implement getField() method for the complex readers
+* [ARROW-1194](https://issues.apache.org/jira/browse/ARROW-1194) - Getting record batch size with pa.get_record_batch_size returns a size that is too small for pandas DataFrame.
+* [ARROW-1197](https://issues.apache.org/jira/browse/ARROW-1197) - [GLib] record_batch.hpp Inclusion is missing
+* [ARROW-1200](https://issues.apache.org/jira/browse/ARROW-1200) - [C++] DictionaryBuilder should use signed integers for indices
+* [ARROW-1201](https://issues.apache.org/jira/browse/ARROW-1201) - [Python] Incomplete Python types cause a core dump when repr-ing
+* [ARROW-1203](https://issues.apache.org/jira/browse/ARROW-1203) - [C++] Disallow BinaryBuilder to append byte strings larger than the maximum value of int32_t
+* [ARROW-1205](https://issues.apache.org/jira/browse/ARROW-1205) - C++: Reference to type objects in ArrayLoader may cause segmentation faults.
+* [ARROW-1206](https://issues.apache.org/jira/browse/ARROW-1206) - [C++] Enable MSVC builds to work with some compression library support disabled
+* [ARROW-1208](https://issues.apache.org/jira/browse/ARROW-1208) - [C++] Toolchain build with ZSTD library from conda-forge failure
+* [ARROW-1215](https://issues.apache.org/jira/browse/ARROW-1215) - [Python] Class methods in API reference
+* [ARROW-1216](https://issues.apache.org/jira/browse/ARROW-1216) - Numpy arrays cannot be created from Arrow Buffers on Python 2
+* [ARROW-1218](https://issues.apache.org/jira/browse/ARROW-1218) - Arrow doesn't compile if all compression libraries are deactivated
+* [ARROW-1222](https://issues.apache.org/jira/browse/ARROW-1222) - [Python] pyarrow.array returns NullArray for array of unsupported Python objects
+* [ARROW-1223](https://issues.apache.org/jira/browse/ARROW-1223) - [GLib] Fix function name that returns wrapped object
+* [ARROW-1235](https://issues.apache.org/jira/browse/ARROW-1235) - [C++] macOS linker failure with operator<< and std::ostream
+* [ARROW-1236](https://issues.apache.org/jira/browse/ARROW-1236) - Library paths in exported pkg-config file are incorrect
+* [ARROW-601](https://issues.apache.org/jira/browse/ARROW-601) - Some logical types not supported when loading Parquet
+* [ARROW-784](https://issues.apache.org/jira/browse/ARROW-784) - Cleaning up thirdparty toolchain support in Arrow on Windows
+* [ARROW-992](https://issues.apache.org/jira/browse/ARROW-992) - [Python] In place development builds do not have a __version__
+
+[2]: https://github.com/apache/arrow/releases/tag/apache-arrow-0.5.0
+[6]: https://www.apache.org/dyn/closer.cgi/arrow/arrow-0.5.0/
+[8]: http://arrow.apache.org/blog/2017/07/23/0.5.0-release/