cloud-fan commented on a change in pull request #31691:
URL: https://github.com/apache/spark/pull/31691#discussion_r594201683
##########
File path:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/Optimizer.scala
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@@ -625,6 +626,36 @@ object LimitPushDown extends Rule[LogicalPlan] {
}
}
+/**
+ * Pushes down [[LocalLimit]] beneath WINDOW.
+ */
+object LimitPushDownThroughWindow extends Rule[LogicalPlan] {
+ // The window frame of RankLike and RowNumberLike is UNBOUNDED PRECEDING to
CURRENT ROW.
Review comment:
`is` -> `can only be`
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