cloud-fan commented on a change in pull request #34504: URL: https://github.com/apache/spark/pull/34504#discussion_r755210674
########## File path: sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/Optimizer.scala ########## @@ -1548,6 +1548,31 @@ object PushPredicateThroughNonJoin extends Rule[LogicalPlan] with PredicateHelpe filter } + case filter @ Filter(condition, w: Window) if w.partitionSpec.isEmpty => + w.windowExpressions match { + case Seq(alias @ Alias(WindowExpression(_: RowNumber, WindowSpecDefinition(Nil, orderSpec, + SpecifiedWindowFrame(RowFrame, UnboundedPreceding, CurrentRow))), _)) => Review comment: I think this optimization should also apply if there are more than one window expressions. The algorithm should simply be ``` val limits = w.windowExpressions.map { case row_number_func => calcuate the limit case _ => none } val limit = limits.min add limit + sort ``` -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: reviews-unsubscr...@spark.apache.org For queries about this service, please contact Infrastructure at: us...@infra.apache.org --------------------------------------------------------------------- To unsubscribe, e-mail: reviews-unsubscr...@spark.apache.org For additional commands, e-mail: reviews-h...@spark.apache.org