[GitHub] [spark] wangyum commented on a change in pull request #33099: [SPARK-35904][SQL] Collapse above RebalancePartitions

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

wangyum commented on a change in pull request #33099:
URL: https://github.com/apache/spark/pull/33099#discussion_r659575705



##########
File path: sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/Optimizer.scala
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@@ -911,6 +911,11 @@ object CollapseRepartition extends Rule[LogicalPlan] {
     // we can remove the child.
     case r @ RepartitionByExpression(_, child: RepartitionOperation, _) =>
       r.copy(child = child.child)
+
+    // Case 3: When a RebalancePartitions has a child of Repartition or RepartitionByExpression
+    // we can remove the child.

Review comment:
       OK




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