https://beam.apache.org/releases/javadoc/2.71.0/org/apache/beam/sdk/extensions/sql/impl/rel/BeamUncollectRel.html
BeamUncollectRel (Apache Beam 2.71.0)
declaration: package: org.apache.beam.sdk.extensions.sql.impl.rel, class: BeamUncollectRel
apache beam