cloud-fan commented on a change in pull request #33079:
URL: https://github.com/apache/spark/pull/33079#discussion_r659590393



##########
File path: 
sql/core/src/main/scala/org/apache/spark/sql/execution/ShuffledRowRDD.scala
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@@ -32,7 +32,16 @@ sealed trait ShufflePartitionSpec
 // `endReducerIndex` (exclusive).
 case class CoalescedPartitionSpec(
     startReducerIndex: Int,
-    endReducerIndex: Int) extends ShufflePartitionSpec
+    endReducerIndex: Int,
+    @transient dataSize: Option[Long] = None) extends ShufflePartitionSpec

Review comment:
       in which case we don't know the size?




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