Github user rxin commented on a diff in the pull request:
https://github.com/apache/spark/pull/10577#discussion_r48930694
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/Optimizer.scala
---
@@ -40,6 +40,8 @@ abstract class Optimizer extends
RuleExecutor[LogicalPlan] {
Batch("Aggregate", FixedPoint(100),
ReplaceDistinctWithAggregate,
RemoveLiteralFromGroupExpressions) ::
+ Batch("Union", FixedPoint(100),
+ CombineUnions) ::
--- End diff --
you should explain in comments why CombineUnions appear twice.
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