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new 29fce3e26f7 [Website] Add ADBC 21 release notes (#727)
29fce3e26f7 is described below
commit 29fce3e26f7732b36fc3e0030110a9d9b368fd00
Author: David Li <[email protected]>
AuthorDate: Mon Nov 10 08:20:04 2025 +0900
[Website] Add ADBC 21 release notes (#727)
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+---
+layout: post
+title: "Apache Arrow ADBC 21 (Libraries) Release"
+date: "2025-11-07 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 version 21 release of
+the Apache Arrow ADBC libraries. This release includes [**30
+resolved issues**][1] from [**23 distinct contributors**][2].
+
+This is a release of the **libraries**, which are at version 21. The
+[**API specification**][specification] is versioned separately and is at
+version 1.1.0.
+
+The subcomponents are versioned independently:
+
+- C/C++/GLib/Go/Python/Ruby: 1.9.0
+- C#: 0.21.0
+- Java: 0.21.0
+- R: 0.21.0
+- Rust: 0.21.0
+
+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].
+
+## Release Highlights
+
+Language bindings:
+- The driver manager reports better errors when it fails to find a driver
([#3646](https://github.com/apache/arrow-adbc/pull/3646)).
+- The Python driver manager now searches for manifests in the proper location
when inside a Python virtual environment
([#3490](https://github.com/apache/arrow-adbc/pull/3490)).
+- Added convenience methods to the driver manager on top of the standard
DBAPI-2.0/PEP249 APIs ([#3539](https://github.com/apache/arrow-adbc/pull/3539)).
+- The signature for `connect` has been simplified, so you can connect without
having to repeat the driver name or specify explicit keyword arguments
depending on the driver
([#3537](https://github.com/apache/arrow-adbc/pull/3537)).
+- Support for Python 3.9 has been dropped
([#3573](https://github.com/apache/arrow-adbc/pull/3573),
[#3663](https://github.com/apache/arrow-adbc/pull/3663)).
+- Support for Python 3.14 (including the free-threading variant) has been
added ([#3575](https://github.com/apache/arrow-adbc/pull/3575),
[#3620](https://github.com/apache/arrow-adbc/pull/3620),
[#3663](https://github.com/apache/arrow-adbc/pull/3663)).
+- The R bindings now support `replace` and `create_append` ingest modes.
+
+Drivers:
+- The Go BigQuery driver now supports service account impersonation
([#3488](https://github.com/apache/arrow-adbc/pull/3488)) and setting a quota
project ([#3622](https://github.com/apache/arrow-adbc/pull/3622)).
+- The Go BigQuery driver now returns more detailed type metadata in result
sets ([#3604](https://github.com/apache/arrow-adbc/pull/3604)).
+- The C# BigQuery driver allows setting a location
([#3494](https://github.com/apache/arrow-adbc/pull/3494)).
+- The C# Databricks driver adjusted default settings to make small queries
faster ([#3489](https://github.com/apache/arrow-adbc/pull/3489)).
+- Memory usage of the C# Databricks driver was improved
([#3652](https://github.com/apache/arrow-adbc/pull/3652),
[#3656](https://github.com/apache/arrow-adbc/pull/3656)).
+- All C# HiveServer2-based drivers (Hive, Impala, Spark, Databricks) throw
Unauthorized exceptions when appropriate
([#3551](https://github.com/apache/arrow-adbc/pull/3551)).
+- JNI bindings to the C++ driver manager are now released, making it possible
to use non-Java drivers from a Java application (in a very limited fashion)
([#3429](https://github.com/apache/arrow-adbc/pull/3429)). Binary artifacts
are available for amd64/arm64 Linux, arm64 macOS, and amd64 Windows.
+- The PostgreSQL driver can now return the schema of any bind parameters in a
prepared query ([#3579[(https://github.com/apache/arrow-adbc/pull/3579)]]).
+- The PostgreSQL driver properly batches result sets with large string/binary
values now ([#3616](https://github.com/apache/arrow-adbc/pull/3616)).
+- The Snowflake driver now returns float64 for numeric columns when
use_high_precision is false and scale is nonzero
([#3295](https://github.com/apache/arrow-adbc/pull/3295)). (Previously it
incorrectly truncated to int64.)
+- Added an option to disable the "vectorized" scanner when ingesting data into
Snowflake, which sometimes appeared to cause performance issues
([#3555](https://github.com/apache/arrow-adbc/pull/3555)).
+
+Packaging:
+- Added AlmaLinux 10 ([#3514](https://github.com/apache/arrow-adbc/pull/3514)).
+- Added Debian Trixie
([#3513](https://github.com/apache/arrow-adbc/pull/3513)).
+
+## Contributors
+
+```
+$ git shortlog --perl-regexp --author='^((?!dependabot\[bot\]).*)$' -sn
apache-arrow-adbc-20..apache-arrow-adbc-21
+ 28 David Li
+ 9 Bruce Irschick
+ 7 eric-wang-1990
+ 6 Curt Hagenlocher
+ 5 eitsupi
+ 4 msrathore-db
+ 3 Bryce Mecum
+ 3 Mandukhai Alimaa
+ 3 Sutou Kouhei
+ 3 davidhcoe
+ 2 Anna Lee
+ 2 Jason Lin
+ 2 Kevin Liu
+ 1 Dewey Dunnington
+ 1 Ian Cook
+ 1 Jacky Hu
+ 1 Jade Wang
+ 1 Kristin Cowalcijk
+ 1 Lucas Valente
+ 1 Matthijs Brobbel
+ 1 bruceNu1l
+ 1 praveentandra
+ 1 rnowacoski
+```
+
+## Roadmap
+
+We are starting work on async interfaces and other API enhancements, and
+welcome comments or contributions from anyone interested. See the initial
+pull requests:
+
+- https://github.com/apache/arrow-adbc/pull/3607
+- https://github.com/apache/arrow-adbc/pull/3623
+
+## Getting Involved
+
+We welcome questions and contributions from all interested. Issues
+can be filed on [GitHub][4], and questions can be directed to GitHub
+or the [Arrow mailing lists][5].
+
+[1]: https://github.com/apache/arrow-adbc/milestone/25
+[2]: #contributors
+[3]:
https://github.com/apache/arrow-adbc/blob/apache-arrow-adbc-21/CHANGELOG.md
+[4]: https://github.com/apache/arrow-adbc/issues
+[5]: {% link community.md %}
+[specification]: https://arrow.apache.org/adbc/21/format/specification.html
