wangyum commented on a change in pull request #32781:
URL: https://github.com/apache/spark/pull/32781#discussion_r648086922
##########
File path:
sql/core/src/main/scala/org/apache/spark/sql/execution/exchange/ShuffleExchangeExec.scala
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@@ -86,11 +86,15 @@ case object ENSURE_REQUIREMENTS extends ShuffleOrigin
// Indicates that the shuffle operator was added by the user-specified
repartition operator. Spark
// can still optimize it via changing shuffle partition number, as data
partitioning won't change.
-case object REPARTITION extends ShuffleOrigin
+case object REPARTITION_BY_COL extends ShuffleOrigin
// Indicates that the shuffle operator was added by the user-specified
repartition operator with
// a certain partition number. Spark can't optimize it.
-case object REPARTITION_WITH_NUM extends ShuffleOrigin
+case object REPARTITION_BY_NUM extends ShuffleOrigin
+
+// Indicates that the shuffle operator was added by the user-specified
repartition operator. Spark
+// first tries to coalesce partitions, if it cannot be coalesced, then use the
local shuffle reader.
Review comment:
Done.
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