manuzhang commented on a change in pull request #28954:
URL: https://github.com/apache/spark/pull/28954#discussion_r448135495
##########
File path:
sql/core/src/main/scala/org/apache/spark/sql/execution/adaptive/CoalesceShufflePartitions.scala
##########
@@ -79,8 +66,29 @@ case class CoalesceShufflePartitions(session: SparkSession)
extends Rule[SparkPl
case stage: ShuffleQueryStageExec if stageIds.contains(stage.id) =>
CustomShuffleReaderExec(stage, partitionSpecs)
}
+ }
+
+ if (validMetrics.isEmpty) {
Review comment:
I think it's like coalescing one less shuffles and handled by the
`nonEmpty` codes.
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