AlenkaF commented on code in PR #668:
URL: https://github.com/apache/arrow-site/pull/668#discussion_r2215904943
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_posts/2025-07-16-21.0.0-release.md:
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+---
+layout: post
+title: "Apache Arrow 21.0.0 Release"
+date: "2025-07-16 00:00:00"
+author: pmc
+categories: [release]
+---
+<!--
+{% comment %}
+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.
+{% endcomment %}
+-->
+
+The Apache Arrow team is pleased to announce the 21.0.0 release. This release
+covers over 2 months of development work and includes [**1234 resolved
+issues**][1] on [**1234 distinct commits**][2] from [**1234 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 20.0.0 release, Alenka Frim has been invited to join the Project
+Management Committee (PMC).
+
+Thanks for your contributions and participation in the project!
+
+## Release Highlights
+
+## Columnar Format
+
+## Arrow Flight RPC Notes
+
+## C++ Notes
+
+### Compute
+
+### Acero
+
+### Filesystems
+
+### Flight RPC
+
+### Parquet
+
+## C# Notes
+
+- TODO: Note about future repo move plan. "This is the final release of the C#
implementation of Arrow as part of the monorepo...etc.
+
+## Java, JavaScript, Go, and Rust Notes
+
+The Java, JavaScript, 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 [JavaScript
+implementation](https://github.com/apache/arrow-js), see the latest [Arrow
+JavaScript changelog][8].
+- 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].
+
+## Linux Packaging Notes
+
+## Python Notes
+
Review Comment:
```suggestion
Compatibility notes:
* Deprecated ``PyExtensionType`` has been removed
[GH-46198](https://github.com/apache/arrow/issues/46198).
* Deprecated ``use_legacy_format``has been removed in favour of setting
``IpcWriteOptions`` [GH-46130](https://github.com/apache/arrow/issues/46130).
* Due to SciPy 1.15's stricter sparse code changes are made to
``pa.SparseCXXMatrix``
constructors and ``pa.SparseCXXMatrix.to_scipy`` methods with migrating from
``scipy.spmatrix`` to ``scipy.sparray``
[GH-45229](https://github.com/apache/arrow/issues/45229).
New features:
* PyArrow does not require NumPy anymore to generate ``float16`` scalars and
arrays [GH-46611](https://github.com/apache/arrow/issues/46611).
* ``pc.utf8_zero_fill`` is now available in the compute module imitating
Python’s
`str.zfill`` [GH-46683](https://github.com/apache/arrow/issues/46683).
* ``pa.arange`` utility function is now available which creates an array of
evenly
spaced values within a given interval
[GH-46771](https://github.com/apache/arrow/issues/46771).
* Scalar subclasses are now implementing Python protocols
[GH-45653](https://github.com/apache/arrow/issues/45653).
* It is possible now to specify footer metadata when opening IPC file for
writing using
metadata keyword in ``pa.ipc.new_file()``
[GH-46222](https://github.com/apache/arrow/issues/46222).
* DLPack is now implemented (export) on the Tensor class in C++ and
available in
Python [GH-39294](https://github.com/apache/arrow/issues/39294).
Other improvements:
* Couple of improvements have been included in the Filesystems module:
Filesystem operations are more convenient to users by supporting explicit
``fsspec+{protocol}`` and ``hf://`` filesystem URIs
[GH-44900](https://github.com/apache/arrow/issues/44900),
``ConfigureManagedIdentityCredential`` and
``ConfigureClientSecretCredential``
have been exposed to ``AzureFileSystem``
[GH-46833](https://github.com/apache/arrow/issues/46833),
``allow_delayed_open``
[GH-45957](https://github.com/apache/arrow/issues/45957)
and ``tls_ca_file_path``
[GH-40754](https://github.com/apache/arrow/issues/40754)
have been exposed to ``S3FileSystem``.
* Parquet module improvements include: mapping of logical types to Arrow
extension
types by default [GH-44500](https://github.com/apache/arrow/issues/44500),
UUID
extension type conversion support when writing or reading to/from Parquet
[GH-43807](https://github.com/apache/arrow/issues/43807) and support for
uniform
encryption when writing parquet files by exposing
``EncryptionConfiguration.uniform_encryption``
[GH-38914](https://github.com/apache/arrow/issues/38914).
* ``filter_expression`` is exposed in ``Table.join`` and ``Dataset.join`` to
support
filtering rows when performing hash joins with Acero
[GH-46572](https://github.com/apache/arrow/issues/46572).
* ``dim_names`` argument can now be passed to ``from_numpy_ndarray``
constructor [GH-45531](https://github.com/apache/arrow/issues/45531).
Relevant bug fixes:
* ``pyarrow.Table.to_struct_array`` failure when the table is empty has been
fixed
[GH-46355](https://github.com/apache/arrow/issues/46355).
* Filtering all rows with ``RecordBatch.filter`` using an expression now
returns
empty table with same schema instead of erroring
[GH-44366](https://github.com/apache/arrow/issues/44366).
```
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