cloud-fan commented on a change in pull request #31404:
URL: https://github.com/apache/spark/pull/31404#discussion_r573461209
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File path:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/Optimizer.scala
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@@ -1007,6 +1007,8 @@ object CombineUnions extends Rule[LogicalPlan] {
def apply(plan: LogicalPlan): LogicalPlan = plan transformDown {
case u: Union => flattenUnion(u, false)
case Distinct(u: Union) => Distinct(flattenUnion(u, true))
+ case Deduplicate(keys: Seq[Attribute], u: Union) if keys == u.output =>
Review comment:
If `u.output` has new expr IDs, then this plan will be unresolved...
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