Github user gatorsmile commented on a diff in the pull request:
https://github.com/apache/spark/pull/19451#discussion_r146763856
--- Diff:
sql/catalyst/src/test/scala/org/apache/spark/sql/catalyst/optimizer/PropagateEmptyRelationSuite.scala
---
@@ -30,6 +30,7 @@ class PropagateEmptyRelationSuite extends PlanTest {
Batch("PropagateEmptyRelation", Once,
CombineUnions,
ReplaceDistinctWithAggregate,
+ ReplaceExceptWithFilter,
--- End diff --
Why?
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