Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/12342#discussion_r59487580
--- 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 --
"non-determinstic" means the condition has internal state and may change
every time it processes an input row. Before push down, we have only one
stateful condition that processes all output rows of `Union`. But if we push it
down, then each child of `Union` will have a stateful condition, I think it's
different than before.
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