Apache Calcite release 1.23.0

This is a source or binary distribution of Apache Calcite.

Changes since the previous release are described in the
site/_docs/history.md file.

The LICENSE and NOTICE files contain license information.

If this is a source distribution, you can find instructions how to
build the release in the "Building from a source distribution" section
in site/_docs/howto.md.

Further information about Apache Calcite is available at its web site,
http://calcite.apache.org.