Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/12342#discussion_r59486756
--- 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 --
I think we can't push filter down if the condition is non-determinstic
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