Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/10451#discussion_r48441867
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/Optimizer.scala
---
@@ -153,6 +153,16 @@ object SetOperationPushDown extends Rule[LogicalPlan]
with PredicateHelper {
)
)
+ // Push down limit into union
+ case Limit(exp, Union(left, right), optimized) if !optimized =>
--- End diff --
This works, but doesn't look good to me. Actually I don't have a good idea
for it either, maybe we should just add comments to explain the assumption here.
cc @marmbrus @yhuai
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