[Website] Add blog post for Arrow 20.0.0

_posts/2025-04-27-20.0.0-release.md

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+---
+layout: post
+title: "Apache Arrow 20.0.0 Release"
+date: "2025-04-27 00:00:00"
+author: pmc
+categories: [release]
+---
+<!--
+{% comment %}
+Licensed to the Apache Software Foundation (ASF) under one or more
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+(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
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+{% endcomment %}
+-->
+
+The Apache Arrow team is pleased to announce the 20.0.0 release. This release
+covers over 2 months of development work and includes [**259 resolved
+issues**][1] on [**327 distinct commits**][2] from [**63 distinct
+contributors**][2]. See the [Install Page](https://arrow.apache.org/install/) to
+learn how to get the libraries for your platform.
+
+The release notes below are not exhaustive and only expose selected highlights
+of the release. Many other bugfixes and improvements have been made: we refer
+you to the [complete changelog][3].
+
+## Community
+
+Since the 19.0.0 release, Ed Seidl, Jean-Baptiste Onofré and Matthijs Brobbel
+have been invited to become committers. Bryce Mecum, Ian Cook, Jacob Wujciak-Jens 
+and Rok Mihevc have been invited to join the Project Management Committee (PMC).
+
+Thanks for your contributions and participation in the project!
+
+## C++ Notes
+
+### Compute
+
+We’ve added several new compute functions: inverse_permutation/scatter ([GH-44393](https://github.com/apache/arrow/issues/44393)), pivot_wider/hash_pivot_wider ([GH-45269](https://github.com/apache/arrow/issues/45269)), rank_normal ([GH-45572](https://github.com/apache/arrow/issues/45572)), skew/kurtosis ([GH-45676](https://github.com/apache/arrow/issues/45676)), and winsorize ([GH-45755](https://github.com/apache/arrow/issues/45755)). 
+
+### Acero
+
+We've significantly improved the Hash Join in terms of overflow-safety ([GH-44513](https://github.com/apache/arrow/issues/44513), [GH-45334](https://github.com/apache/arrow/issues/45334), [GH-45506](https://github.com/apache/arrow/issues/45506)), memory consumption (peak memory usage reduced by half: [GH-45551](https://github.com/apache/arrow/issues/45551)), and performance (up to several dozen times faster: [GH-45611](https://github.com/apache/arrow/issues/45611), [GH-45917](https://github.com/apache/arrow/issues/45917)).
+
+### Filesystems
+
+### Flight RPC
+
+- The experimental Flight over UCX feature has been removed.
+([#43296](https://github.com/apache/arrow/issues/43296))
+
+### Parquet
+
+## C# Notes
+
+- Added support for the `Ordered` and `AppMetaData` fields to FlightInfo ([#45753](https://github.com/apache/arrow/pull/45753))
+- FlightClient can now be integrated with [Grpc.Net.ClientFactory](https://learn.microsoft.com/en-us/aspnet/core/grpc/clientfactory?view=aspnetcore-9.0) ([#45451](https://github.com/apache/arrow/issues/45451))
+
+## Linux Packaging Notes
+
+https://apache.jfrog.io/ is still available but https://packages.apache.org/ is preferred because the latter uses the apache.org domain.
+
+## Python Notes
+
+Compatibility notes:
+* Minimum supported Cython has been raised to 3 and higher [GH-45237](https://github.com/apache/arrow/issues/45237) .
+* A subset of deprecated APIs have been removed
+  [GH-45680](https://github.com/apache/arrow/issues/45680): 
+   ``PARQUET_2_0`` [GH-45848](https://github.com/apache/arrow/issues/45848),
+   ``use_legacy_dataset`` [GH-44790](https://github.com/apache/arrow/issues/44790),
+   serialize/deserialize PyArrow C++ code [GH-43587](https://github.com/apache/arrow/issues/43587) . 
+
+New features:
+* Large variable width types are supported in NumPy conversion
+  [GH-35289](https://github.com/apache/arrow/issues/35289).
+* Biased/unbiased option are available in skew and kurtosis compute functions
+  [GH-45733](https://github.com/apache/arrow/issues/45733).
+* Support for SAS token in the ``AzureFileSystem`` has been added
+  [GH-45705](https://github.com/apache/arrow/issues/45705).
+* Interchange of  ``decimal32``, ``decimal64`` and ``decimal256`` data type objects between
+  Pandas and PyArrow is now supported [GH-45582](https://github.com/apache/arrow/issues/45582),
+  [GH-45570](https://github.com/apache/arrow/issues/45570).
+* ``pyarrow.ArrayStatistics``and  ``pyarrow.Array.statistics()`` are added
+  [GH-45457](https://github.com/apache/arrow/issues/45457).
+* Bindings for JSON streaming reader are added
+  [GH-14932](https://github.com/apache/arrow/issues/14932).
+* Bindings for ``MemoryPool::total_bytes_allocated`` and ``MemoryPool::num_allocations`` are added.
+  Also allocator-specific statistics can now be printed to stderr [GH-45358](https://github.com/apache/arrow/issues/45358).
+* A new ``maps_as_pydicts``parameter is introduced to ``to_pylist``, ``to_pydict`` and ``as_py``
+  methods enabling deserialization into Python dictionary instead of list of tuples
+  [GH-39010](https://github.com/apache/arrow/issues/39010).
+
+Other improvements:
+*  Source (sdist) and binary distribution (wheels) are now uploaded to GitHub Releases
+  [GH-45920](https://github.com/apache/arrow/issues/45920).
+* Cython code has been cleaned up as we now require at least Cython 3.0
+  [GH-45433](https://github.com/apache/arrow/issues/45433).
+* Building of free-threaded wheels on Windows is enabled
+  [GH-44421](https://github.com/apache/arrow/issues/44421) .
+*Wheels for Alpine Linux are now provided [GH-18036](https://github.com/apache/arrow/issues/18036) .
+
+
+Relevant bug fixes:
+* Pandas conversion roundtrip with bytes column names error is fixed
+  [GH-44188](https://github.com/apache/arrow/issues/44188).
+* Exceptions are raised instead of showing segfaults when users try to instantiate internal Parquet
+  metadata classes [GH-36628](https://github.com/apache/arrow/issues/36628).
+
+## R Notes
+
+- Binary Arrays now inherit from `blob::blob` in addition to `arrow_binary` when
+  [converted to R
+  objects](https://arrow.apache.org/docs/r/articles/data_types.html#translations-from-arrow-to-r).
+  This change is the first step in eventually deprecating the `arrow_binary`
+  class in favor of the `blob` class in the
+  [`blob`](https://cran.r-project.org/package=blob) package (See
+  [GH-45709](https://github.com/apache/arrow/issues/45709)).
+
+## Ruby and C GLib Notes
+
+### Improvements
+
+- `garrow_array_validate()` / `Arrow::Array#validate`: Added.
+  - [GH-45328](https://github.com/apache/arrow/issues/45328)
+- `garrow_array_validate_full()` / `Arrow::Array#validate_full`: Added.
+  - [GH-45342](https://github.com/apache/arrow/issues/45342)
+- `garrow_record_batch_validate()` / `Arrow::RecordBatch#validate`: Added.
+  - [GH-45353](https://github.com/apache/arrow/issues/45353)
+- `garrow_record_batch_validate_full()` /
+  `Arrow::RecordBatch#validate_full`: Added.
+  - [GH-45386](https://github.com/apache/arrow/issues/45386)
+- `garrow_table_validate()` / `Arrow::Table#validate`: Added.
+  - [GH-45414](https://github.com/apache/arrow/issues/45414)
+- `garrow_table_validate_full()` / `Arrow::Table#validate_full`: Added.
+  - [GH-45468](https://github.com/apache/arrow/issues/45468)
+- `GArrowArrayStatistics()` / `Arrow::ArrayStatistics`: Added.
+  - [GH-45490](https://github.com/apache/arrow/issues/45490)
+- Changed to require Meson 0.61.2 or later.
+- `GArrowBinaryViewArray()` / `Arrow::BinaryViewArray`: Added.
+  - [GH-45650](https://github.com/apache/arrow/issues/45650)
+- `GArrowStringViewArray()` / `Arrow::StringViewArray`: Added.
+  - [GH-45711](https://github.com/apache/arrow/issues/45711)
+- Added support for
+  [rubygems-requirements-system](https://rubygems.org/gems/rubygems-requirements-system)
+  - [GH-45976](https://github.com/apache/arrow/issues/45976)
+
+### Incompatible changes
+
+- `gparquet_arrow_file_writer_new_row_group()` /
+  `Parquet:ArrowFileWriter#new_row_group`: Removed `chunk_size` argument.
+  - [GH-45088](https://github.com/apache/arrow/issues/45088)
+- `garrow_record_batch_new()` / `Arrow::RecordBatch#initialize`:
+  Stopped validating automatically. If you want to validate a created
+  record batch, call `garrow_record_batch_validate()` /
+  `Arrow::RecordBatch#validate` explicitly.
+  - [GH-45353](https://github.com/apache/arrow/issues/45353)
+- `garrow_table_new()` / `Arrow::Table#initialize`: Stopped validating
+  automatically. If you want to validate a created table, call
+  `garrow_table_validate()` / `Arrow::Table#validate` explicitly.
+  - [GH-45414](https://github.com/apache/arrow/issues/45414)
+
+## Java, Go, and Rust Notes
+
+The Java, Go, and Rust Go projects have moved to separate repositories outside
+the main Arrow [monorepo](https://github.com/apache/arrow).
+
+- For notes on the latest release of the [Java
+implementation](https://github.com/apache/arrow-java), see the latest [Arrow
+Java changelog][7].
+- For notes on the latest release of the [Rust
+  implementation](https://github.com/apache/arrow-rs) see the latest [Arrow Rust
+  changelog][5].
+- For notes on the latest release of the [Go
+implementation](https://github.com/apache/arrow-go), see the latest [Arrow Go
+changelog][6].
+
+[1]: https://github.com/apache/arrow/milestone/65?closed=1
+[2]: {{ site.baseurl }}/release/20.0.0.html#contributors
+[3]: {{ site.baseurl }}/release/20.0.0.html#changelog
+[4]: {{ site.baseurl }}/docs/r/news/
+[5]: https://github.com/apache/arrow-rs/blob/main/CHANGELOG.md
+[6]: https://github.com/apache/arrow-go/releases
+[7]: https://github.com/apache/arrow-java/releases