cloud-fan commented on code in PR #43435:
URL: https://github.com/apache/spark/pull/43435#discussion_r1375912650


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sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/plans/physical/partitioning.scala:
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@@ -708,6 +736,26 @@ case class HashShuffleSpec(
   override def numPartitions: Int = partitioning.numPartitions
 }
 
+case class CoalescedHashShuffleSpec(
+    from: ShuffleSpec,
+    @transient partitions: Seq[CoalescedBoundary]) extends ShuffleSpec {

Review Comment:
   which plan may hold `ShuffleSpec`? and do we need to do the same for other 
`ShuffleSpec`s?



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