Github user HyukjinKwon commented on a diff in the pull request:
https://github.com/apache/spark/pull/17899#discussion_r215843736
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/Optimizer.scala
---
@@ -726,14 +726,36 @@ object CollapseRepartition extends Rule[LogicalPlan] {
object CollapseWindow extends Rule[LogicalPlan] {
def apply(plan: LogicalPlan): LogicalPlan = plan transformUp {
case w1 @ Window(we1, ps1, os1, w2 @ Window(we2, ps2, os2, grandChild))
- if ps1 == ps2 && os1 == os2 &&
w1.references.intersect(w2.windowOutputSet).isEmpty &&
--- End diff --
I wouldn't include style changes
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