[ANNOUNCE] Apache Calcite 1.27.0 released

[Stamatis Zampetakis <za...@apache.org>]

The Apache Calcite team is pleased to announce the release of Apache
Calcite 1.27.0.

Calcite is a dynamic data management framework. Its cost-based
optimizer converts queries, represented in relational algebra, into
executable plans. Calcite supports many front-end languages and
back-end data engines, and includes an SQL parser and, as a
sub-project, the Avatica JDBC driver.

This release comes eight months after 1.26.0. It includes more than 
150 resolved issues, comprising a few new features, three minor 
breaking changes, many bug-fixes and small improvements, as well
as code quality enhancements and better test coverage.

You can start using it in Maven by simply updating your dependency to:

  <dependency>
    <groupId>org.apache.calcite</groupId>
    <artifactId>calcite-core</artifactId>
    <version>1.27.0</version>
  </dependency>

If you'd like to download the source release, you can find it here:

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

You can read more about the release (including release notes) here:

https://calcite.apache.org/news/2021/06/03/release-1.27.0/

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

https://calcite.apache.org/

Thanks to everyone involved!

Stamatis Zampetakis, on behalf of the Apache Calcite Team