rangadi commented on code in PR #40561:
URL: https://github.com/apache/spark/pull/40561#discussion_r1151443903
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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:
dropDuplicates() produces different output between batch and streaming too
(because batch does not drop late records).
As much as possible it is better to keep the API same between batch and
streaming.
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