Github user davies commented on a diff in the pull request: https://github.com/apache/spark/pull/12342#discussion_r59487855 --- Diff: sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/Optimizer.scala --- @@ -975,6 +939,73 @@ object PushPredicateThroughAggregate extends Rule[LogicalPlan] with PredicateHel } else { filter } + + case filter @ Filter(condition, u: Union) => --- End diff -- Each state should be separate in partition, Union does not change the partition. Coalesce() could change that.
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