[Website] Add ADBC 18 release post

_posts/2025-05-06-adbc-18-release.md

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+---
+layout: post
+title: "Apache Arrow ADBC 18 (Libraries) Release"
+date: "2025-05-06 00:00:00"
+author: pmc
+categories: [release]
+---
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+
+The Apache Arrow team is pleased to announce the version 18 release of
+the Apache Arrow ADBC libraries. This release includes [**28
+resolved issues**][1] from [**22 distinct contributors**][2].
+
+This is a release of the **libraries**, which are at version 18.  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: 1.6.0
+- C#: 0.18.0
+- Java: 0.18.0
+- R: 0.18.0
+- Rust: 0.18.0
+
+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
+
+Using Meson to build the project has been improved (#2735, #2746).
+
+The C# bindings and its drivers have seen a lot of activity in this release.  A Databricks Spark driver is now available (#2672, #2737, #2743, #2692), with support for features like CloudFetch (#2634, #2678, #2691).  The general Spark driver now has better retry behavior for 503 responses (#2664), supports LZ4 compression applied outside of the Arrow IPC format (#2669), and supports OAuth (#2579), among other improvements.  The "Apache" driver for various Thrift-based systems now supports Apache Hive in addition to Apache Spark and Apache Impala (#2540), among other improvements.  The BigQuery driver adds more authentication and other configuration settings (#2655, #2566, #2541, #2698).
+
+The Flight SQL driver supports OAuth (#2651).
+
+The Java bindings experimentally support a JNI wrapper around drivers exposing the ADBC C API (#2401).  These are not currently distributed via Maven and must be built by hand.
+
+The Go bindings now support union types in the `database/sql` wrapper (#2637).  The Golang-based BigQuery driver returns more metadata about tables (#2697).
+
+The PostgreSQL driver now avoids spurious commit/rollback commands (#2685).  It also handles improper usage more gracefully (#2653).
+
+The Python bindings now make it easier to pass options in various places (#2589, #2700).  Also, the DB-API layer can be minimally used without PyArrow installed, making it easier for users of libraries like polars that don't need or want a second Arrow implementation (#2609).
+
+The Rust bindings now avoid locking the driver on every operation, allowing concurrent usage (#2736).
+
+## Contributors
+
+```
+$ git shortlog --perl-regexp --author='^((?!dependabot\[bot\]).*)$' -sn apache-arrow-adbc-17..apache-arrow-adbc-18
+    20	David Li
+     6	William Ayd
+     5	Curt Hagenlocher
+     5	davidhcoe
+     4	Alex Guo
+     4	Felipe Oliveira Carvalho
+     4	Jade Wang
+     4	Matthijs Brobbel
+     4	Sutou Kouhei
+     4	eric-wang-1990
+     3	Bruce Irschick
+     2	Milos Gligoric
+     2	Sudhir Reddy Emmadi
+     2	Todd Meng
+     1	Bryce Mecum
+     1	Dewey Dunnington
+     1	Filip Wojciechowski
+     1	Hiroaki Yutani
+     1	Hélder Gregório
+     1	Marin Nozhchev
+     1	amangoyal
+     1	qifanzhang-ms
+```
+
+## Roadmap
+
+There is some discussion on a potential second revision of ADBC to include more missing functionality and asynchronous API support.  For more, see the [milestone](https://github.com/apache/arrow-adbc/milestone/8).  We would welcome suggestions on APIs that could be added or extended.  Some of the contributors are planning to begin work on a proposal in the near future.
+
+## 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/22
+[2]: #contributors
+[3]: https://github.com/apache/arrow-adbc/blob/apache-arrow-adbc-18/CHANGELOG.md
+[4]: https://github.com/apache/arrow-adbc/issues
+[5]: {% link community.md %}
+[specification]: https://arrow.apache.org/adbc/18/format/specification.html