cloud-fan commented on a change in pull request #33541:
URL: https://github.com/apache/spark/pull/33541#discussion_r679640303
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File path:
sql/core/src/main/scala/org/apache/spark/sql/execution/adaptive/AQEShuffleReadExec.scala
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@@ -112,6 +128,16 @@ case class AQEShuffleReadExec private(
partitionSpecs.exists(_.isInstanceOf[PartialMapperPartitionSpec]) ||
partitionSpecs.exists(_.isInstanceOf[CoalescedMapperPartitionSpec])
+ def isCoalescedRead: Boolean = {
+ partitionSpecs.sliding(2).forall {
+ // A single partition spec which is `CoalescedPartitionSpec` also means
coalesced read.
+ case Seq(_: CoalescedPartitionSpec) => true
+ case Seq(l: CoalescedPartitionSpec, r: CoalescedPartitionSpec) =>
+ l.endReducerIndex <= r.startReducerIndex
Review comment:
what do you mean? coalesced partition can be in any position
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