rangadi commented on code in PR #40561:
URL: https://github.com/apache/spark/pull/40561#discussion_r1151482426
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sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/Optimizer.scala:
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@@ -679,6 +679,8 @@ object RemoveNoopUnion extends Rule[LogicalPlan] {
d.withNewChildren(Seq(simplifyUnion(u)))
case d @ Deduplicate(_, u: Union) =>
d.withNewChildren(Seq(simplifyUnion(u)))
+ case d @ DeduplicateWithinWatermark(_, u: Union) =>
Review Comment:
There is no perfect watermark, and any guarantees that apply only with
"perfect watermark" are no guarantees at all.
I don't think semantic deferences require disabling batch.
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