[ANNOUNCE] Apache Calcite Avatica 1.21.0 Released

[Francis Chuang <fr...@apache.org>]

The Apache Calcite team is pleased to announce the release of Apache 
Calcite Avatica 1.21.0.

Avatica is a framework for building database drivers. Avatica defines a 
wire API and serialization mechanism for clients to communicate with a 
server as a proxy to a database. The reference Avatica client and server
are implemented in Java and communicate over HTTP. Avatica is a 
sub-project of Apache Calcite.

Apache Calcite Avatica 1.21.0 is a maintenance release with dependency 
upgrades and added support for Oracle JDK 16 to 18. Of particular note 
is Log4j2 being upgrade to 2.16.0 and subsequently 2.17.0 and 2.17.1 to 
address CVE-2021-44228, CVE-2021-45105 and CVE-2021-44832. For a full 
list of changes, please see the release notes:

   https://calcite.apache.org/avatica/docs/history.html#v1-21-0

The release is available here:

   https://calcite.apache.org/avatica/downloads/avatica.html

We welcome your help and feedback. For more information on how to report
problems and get involved, visit the project website at:

    https://calcite.apache.org/avatica/

or the Apache Calcite project website:

    https://calcite.apache.org/

Thanks to everyone involved!

Francis Chuang, on behalf of the Apache Calcite team.