Apache Calcite Avatica release 1.22.0

# Overview
This is a source or binary distribution of Avatica, a framework for
building database drivers. Avatica is a sub-project of Apache Calcite.

# Build
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.

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

# Usage
README.md contains examples of running Avatica.

# Legal
The LICENSE and NOTICE files contain license information.

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