ulysses-you commented on a change in pull request #33342:
URL: https://github.com/apache/spark/pull/33342#discussion_r669434839
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File path:
sql/core/src/main/scala/org/apache/spark/sql/execution/adaptive/CustomShuffleReaderExec.scala
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@@ -92,6 +92,8 @@ case class CustomShuffleReaderExec private(
*/
def hasCoalescedPartition: Boolean = {
partitionSpecs.exists {
+ // shuffle from empty RDD
+ case CoalescedPartitionSpec(0, 0, _) => true
Review comment:
it should be more clearer than `s.startReducerIndex + 1 !=
s.endReducerIndex`
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