wangyum commented on a change in pull request #33603:
URL: https://github.com/apache/spark/pull/33603#discussion_r684877019
##########
File path:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/Optimizer.scala
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@@ -913,10 +913,17 @@ object CollapseRepartition extends Rule[LogicalPlan] {
case (false, true) => if (r.numPartitions >= child.numPartitions) child
else r
case _ => r.copy(child = child.child)
}
+ case r @ Repartition(_, _, p @ Project(_, child: RepartitionOperation)) =>
Review comment:
Not all `RepartitionOperation` can be removed. Sometimes repartition
before joining and filtering to increase parallelism, especially before
`BroadcastNestedLoopJoin`.
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