https://calcite.apache.org/javadocAggregate/org/apache/calcite/rel/stream/StreamRules.DeltaUnionTransposeRule.html
StreamRules.DeltaUnionTransposeRule (Apache Calcite API)
declaration: package: org.apache.calcite.rel.stream, class: StreamRules, class: DeltaUnionTransposeRule
apache calciteapi