cloud-fan commented on a change in pull request #32872:
URL: https://github.com/apache/spark/pull/32872#discussion_r665503534
##########
File path:
sql/core/src/main/scala/org/apache/spark/sql/execution/adaptive/CustomShuffleReaderExec.scala
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@@ -87,8 +87,22 @@ case class CustomShuffleReaderExec private(
Iterator(desc)
}
- def hasCoalescedPartition: Boolean =
- partitionSpecs.exists(_.isInstanceOf[CoalescedPartitionSpec])
+ private def isCoalesced(spec: ShufflePartitionSpec) = coalesceRange(spec) > 1
+
+ /**
+ * How many partitions were coalesced; 0 if not [[CoalescedPartitionSpec]]
+ */
+ private def coalesceRange(spec: ShufflePartitionSpec) = spec match {
+ case s: CoalescedPartitionSpec => s.endReducerIndex - s.startReducerIndex
+ case _ => 0
+ }
+
+ /**
+ * Returns true iff some non-empty partitions were combined
+ */
+ def hasCoalescedPartition: Boolean = {
+ partitionSpecs.exists(isCoalesced)
Review comment:
Can we use this simple implementation? 3 methods looks a bit overkill.
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