dongjoon-hyun commented on a change in pull request #31691:
URL: https://github.com/apache/spark/pull/31691#discussion_r594587044
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File path:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/Optimizer.scala
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@@ -625,6 +626,37 @@ object LimitPushDown extends Rule[LogicalPlan] {
}
}
+/**
+ * Pushes down [[LocalLimit]] beneath WINDOW.
Review comment:
Shall we add an `itemized` functionality and limitation here because
`LimitPushDownThroughWindow` has the limited functionality and it's difficult
to track by reading the code? It would be helpful when we add a new feature and
maintain this optimizer.
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