https://beam.apache.org/releases/javadoc/2.7.0/org/apache/beam/sdk/extensions/sql/impl/rel/BeamSortRel.html
BeamSortRel (Apache Beam 2.7.0)
apache beam
https://beam.apache.org/releases/javadoc/2.33.0/org/apache/beam/sdk/extensions/sql/impl/rel/BeamSortRel.BeamSqlRowComparator.html
BeamSortRel.BeamSqlRowComparator (Apache Beam 2.33.0)
apache beam