zml1206 commented on code in PR #44145:
URL: https://github.com/apache/spark/pull/44145#discussion_r1418279638
##########
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/InferWindowGroupLimit.scala:
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@@ -68,10 +72,57 @@ object InferWindowGroupLimit extends Rule[LogicalPlan] with
PredicateHelper {
case _ => false
}
+ private def limitSupport(limit: Int, window: Window): Boolean =
+ limit <= conf.windowGroupLimitThreshold && window.child.maxRows.forall(_ >
limit) &&
+ !window.child.isInstanceOf[WindowGroupLimit] &&
+ window.windowExpressions.forall(isExpandingWindow) &&
+ window.orderSpec.exists(!_.foldable) &&
+ // LimitPushDownThroughWindow have better performance than
WindowGroupLimit if the
+ // window function is Rank, DenseRank and RowNumber, and Window
partitionSpec is empty.
+ !(window.partitionSpec.isEmpty &&
supportsPushdownThroughWindow(window.windowExpressions) &&
Review Comment:
Done.
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