Apache Calcite release 1.21.0
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.