Website: Add blog post for 25.0.0

_posts/2026-07-10-25.0.0-release.md

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+---
+layout: post
+title: "Apache Arrow 25.0.0 Release"
+date: "2026-07-10 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
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+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 25.0.0 release. This release
+covers over 3 months of development work and includes [**222 resolved
+issues**][1] on [**268 distinct commits**][2] from [**66 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].
+
+
+## Format Notes
+
+We clarified that variadic buffers exported over the C Data Interface could be
+null ([GH-50255](https://github.com/apache/arrow/pull/50255)). Consumers of the C Data Interface must be ready to handle them.
+
+## Arrow Flight RPC Notes
+
+The Flight SQL protocol was amended to let servers explicitly inform clients whether a prepared statement contains a result set or not ([GH-49497](https://github.com/apache/arrow/issues/49497)).
+
+Progress was made on the ODBC driver for Flight SQL, but we are not yet distributing packages for end users at this time.
+
+## C++ Notes
+
+### CSV
+
+A new option `default_column_type` disables type inference for all columns, including
+those not listed in the `column_types` mapping ([GH-47663](https://github.com/apache/arrow/pull/47663)).
+
+### Compute
+
+A new `hypot` compute function calculates Euclidean norms without the avoidable
+overflow of a naive implementation
+([GH-50198](https://github.com/apache/arrow/pull/50198)).
+
+Comparison functions have been upgraded to support StringView and BinaryView inputs
+([GH-49964](https://github.com/apache/arrow/pull/49964)).
+
+Sort functions and their siblings (rank, select-k) now allow configuring per-key
+null placement, so as to emulate SQL constructs such as
+`ORDER BY i NULLS FIRST, j NULLS LAST` ([GH-46926](https://github.com/apache/arrow/pull/46926)).
+
+Rank functions now correctly distinguish NaNs from null values in floating-point
+arrays ([GH-45193](https://github.com/apache/arrow/pull/45193)).
+
+The `count` function now accounts for logical nulls in run-end-encoded arrays ([GH-49908](https://github.com/apache/arrow/pull/49908)).
+
+### File Systems
+
+The `FileSystemFactory` interface, used for dynamically-initialized filesystem
+implementations, now allows passing a set of key-value pairs in addition to a
+URI. This allows to pass sensitive initialization data, such as credentials,
+without leaking them in the URI ([GH-50044](https://github.com/apache/arrow/pull/50044)).
+
+### IPC
+
+We made the IPC reader stricter in a number of places, which could reject
+invalid IPC streams or files that would previously appear to read successfully
+(#49897, #50235).
+
+### Parquet
+
+When writing a Parquet file with bloom filters enabled, bloom filters are
+automatically "folded" so as to match the configured fpp (the max false positive
+rate) according to the actual cardinality of the data used for the filter.
+This can provide size savings, especially with the conservative default
+cardinality estimate ([GH-50008](https://github.com/apache/arrow/pull/50008)).
+
+Bloom filters can be faster on some platforms thanks to vectorization ([GH-50030](https://github.com/apache/arrow/pull/50030)).
+
+It is now possible to read and write ListView data from/to Parquet ([GH-50160](https://github.com/apache/arrow/pull/50160)).
+
+### Miscellaneous C++ changes
+
+On ARM64 platforms, Arrow C++ now supports dynamically dispatching to SVE-optimized
+routines on compatible CPUs ([GH-49756](https://github.com/apache/arrow/pull/49756)). Previously, dynamic dispatch was only supported
+on x86 platforms.
+
+Runtime CPU detection now uses xsimd instead of home-grown detection functions
+([GH-49940](https://github.com/apache/arrow/pull/49940)).
+
+The `ChunkedArray` class has a new method `ComputeLogicalNullCount`, mirroring
+the existing methods of the same name on `Array` and `ArrayData` classes ([GH-50261](https://github.com/apache/arrow/pull/50261)).
+
+The `Table` class has a new method `ToTensor` complementing the existing method
+of the same on the `RecordBatch` class ([GH-41870](https://github.com/apache/arrow/pull/41870)). Both methods convert from the
+columnar format to a contiguous two-dimensional array.
+
+## Linux Packaging Notes
+
+The release dropped support for Debian bookworm [GH-50200](https://github.com/apache/arrow/issues/50200) due to
+the distribution reaching End Of Life.
+
+We added Reproducible Builds support for the Debian Linux Packages [GH-49988](https://github.com/apache/arrow/issues/49988).
+
+## Python Notes
+
+### Compatibility notes
+
+* Feather reader and writer is deprecated in favour of the Arrow IPC API
+  [GH-49232](https://github.com/apache/arrow/issues/49232).
+
+### New features
+
+* ``hypot`` compute kernel is added to Arrow compute module and accessible
+  in PyArrow [GH-50197](https://github.com/apache/arrow/issues/50197).
+* ``pa.OSFile`` now accepts open file descriptor (``int`` parameter) besides
+  the ``str`` path [GH-49751](https://github.com/apache/arrow/issues/49751).
+* Conversion from a list of individual ``numpy.ndarrays`` to a ``FixedShapeTensor``
+  is added [GH-49644](https://github.com/apache/arrow/issues/49644).
+* ``create_encryption_properties`` and ``create_decryption_properties`` methods
+  are added to the parquet API using Arrow C++ ``FileEncryptionPropertiesBuilder``
+  and ``FileDecryptionPropertiesBuilder`` [GH-47435](https://github.com/apache/arrow/issues/47435).
+* Conversion of Table to Tensor has been implemented in Arrow C++ and can also
+  be used in Python bindings [GH-40062](https://github.com/apache/arrow/issues/40062).
+* ``default_column_type`` option is added to ``csv.ConvertOptions`` which sets a
+  default column type for all columns and can be combined with ``column_types``
+  [GH-22232](https://github.com/apache/arrow/issues/22232).
+
+### Other improvements
+
+* Extension types are supported in ``pyarrow.parquet.read_schema``
+  [GH-48254](https://github.com/apache/arrow/issues/48254)
+* Default values for Parquet `pre_buffer` are made consistent
+  [GH-49923](https://github.com/apache/arrow/issues/49923).
+
+### Relevant bug fixes
+
+* ``count`` compute kernel bug for sliced union arrays is fixed
+  [GH-50113](https://github.com/apache/arrow/issues/50113).
+* ``hash_any/hash_all`` compute kernel bug is fixed for sliced
+  boolean arrays [GH-50043](https://github.com/apache/arrow/issues/50043).
+* ``Table.from_pylist`` on ``ExtensionType`` column with ``list_`` storage
+  crash when values exceed int32 offsets is fixed [GH-50012](https://github.com/apache/arrow/issues/50012).
+* Bug causing Use-After-Free on ``PyList_SetItem`` in `SparseCSFTensorToNdarray`
+  is fixed [GH-49917](https://github.com/apache/arrow/issues/49917).
+* Timezone drop when converting tz-aware pandas Categorical is fixed
+  [GH-49875](https://github.com/apache/arrow/issues/49875).
+* `_export_to_c` segmentation fault for `binary_view` array is fixed by
+  fixing cast kernels so all-inline view arrays do not keep a null variadic
+  buffer slot [GH-49740](https://github.com/apache/arrow/issues/49740).
+* `replace_with_mask` crash when null type inputs are used is
+  fixed [GH-47447](https://github.com/apache/arrow/issues/47447).
+* Segmentation fault when using ``sort_indices`` for temporal types
+  is fixed [GH-47252](https://github.com/apache/arrow/issues/47252)
+* Index level is bumped if pandas dataframe already contains ``__index_level_i__``
+  column [GH-46179](https://github.com/apache/arrow/issues/46179).
+* Special handling for single-file paths passed to ``ParquetDataset``
+  constructor is restored, fixing merge error in ``pyarrow.parquet.read_table``
+  [GH-43574](https://github.com/apache/arrow/issues/43574).
+
+### Other
+
+* Annotations are withhold from Python wheels until they are complete
+  [GH-49831](https://github.com/apache/arrow/issues/49831).
+* PyBuffer and NumPyBuffer destructors are protected against interpreter
+  finalization [GH-49942](https://github.com/apache/arrow/issues/49942).
+* Documentation updates in [GH-50227](https://github.com/apache/arrow/issues/50227)
+  and [GH-20403](https://github.com/apache/arrow/issues/20403).
+* Tests for regular ``replace_with_mask`` kernel usage are added
+  [GH-50072](https://github.com/apache/arrow/issues/50072).
+* Hypothesis timezones test strategy now includes fixed offsets [GH-31318](https://github.com/apache/arrow/issues/31318).
+
+## R Notes
+
+### Breaking changes
+
+- Arrow uint64 types are now always converted to R double (numeric) vectors, regardless of the values. Previously, small uint64 values were converted to R integer, which could cause inconsistent types within list columns when different list elements had different value ranges (#50339).
+
+### New features
+
+- Field objects now support field-level metadata via $metadata and $with_metadata() (@max-romagnoli, #33390).
+- Parquet files now support list-columns of ordered factors (ordered dictionaries) (#49689).
+
+### Minor improvements and fixes
+
+- Array$create() now gives a clearer error message when given a POSIXct object with an invalid timezone (#40886).
+- Dictionary arrays with large_string value types now convert correctly to R factors (#39603).
+- open_dataset() now gives a clearer error message when providing a mix of readr and Arrow options (@Rich-T-kid, #33420).
+- read_parquet() no longer triggers a C++ alignment warning from the Acero source node (#46178).
+- Schema metadata partial matching on $metadata$r no longer errors when other metadata keys start with “r” (#50163).
+- to_arrow() now preserves group_by() when converting from a dbplyr lazy table (#40640).
+- write_parquet() now correctly validates that max_rows_per_group is a positive number (#40742).
+- Stale S3 connections no longer cause a segfault during garbage collection (#50009).
+- Spurious “Invalid metadata$r” warnings are no longer emitted when reading files with custom schema metadata (#48712).
+
+### Installation
+
+-  The R package now builds under r-universe/r-wasm (#49981).
+
+## Ruby and C GLib Notes
+
+- Added fallback data type for unknown extension type: [GH-49969](https://github.com/apache/arrow/pull/49969)
+
+### Ruby
+
+- Added `RecordBatch#merge`: [GH-50175](https://github.com/apache/arrow/pull/50175)
+- Ensuring zero-initializing all `rb_memory_view_t` members for `rb_memory_view_get()`: [GH-50234](https://github.com/apache/arrow/pull/50234)
+
+### C GLib
+
+No C GLib only notes.
+
+## Java, JavaScript, Go, .NET, Swift and Rust Notes
+
+The Java, JavaScript, Go, .NET, Swift and Rust 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].
+- For notes on the latest release of the [.NET
+implementation](https://github.com/apache/arrow-dotnet), see the latest [Arrow  .NET changelog][9].
+- For notes on the latest release of the [Swift implementation](https://github.com/apache/arrow-swift), see the latest [Arrow Swift changelog][10].
+
+[1]: https://github.com/apache/arrow/milestone/74?closed=1
+[2]: {{ site.baseurl }}/release/25.0.0.html#contributors
+[3]: {{ site.baseurl }}/release/25.0.0.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>
+[8]: <https://github.com/apache/arrow-js/releases>
+[9]: <https://github.com/apache/arrow-dotnet/releases>
+[10]: <https://github.com/apache/arrow-swift/releases>