[GitHub] [spark] cloud-fan commented on a diff in pull request #35334: [SPARK-38034][SQL] Optimize TransposeWindow rule

[GitBox <gi...@apache.org>]

cloud-fan commented on code in PR #35334:
URL: https://github.com/apache/spark/pull/35334#discussion_r937301117


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sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/Optimizer.scala:
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@@ -1148,9 +1148,9 @@ object CollapseWindow extends Rule[LogicalPlan] {
  */
 object TransposeWindow extends Rule[LogicalPlan] {
   private def compatiblePartitions(ps1 : Seq[Expression], ps2: Seq[Expression]): Boolean = {
-    ps1.length < ps2.length && ps2.take(ps1.length).permutations.exists(ps1.zip(_).forall {

Review Comment:
   I'd consider this as a perf bug...



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