cloud-fan commented on a change in pull request #33123:
URL: https://github.com/apache/spark/pull/33123#discussion_r660656779



##########
File path: 
sql/core/src/main/scala/org/apache/spark/sql/execution/adaptive/ShufflePartitionsUtil.scala
##########
@@ -172,7 +172,7 @@ object ShufflePartitionsUtil extends Logging {
     // coalesce any partitions after the end of last skew section.
     if (numPartitions > start) {
       val partitionSpecs = coalescePartitions(
-        partitionIndices(start), partitionIndices.last + 1, validMetrics, 
targetSize)
+        partitionIndices(start), partitionIndices.last + 1, validMetrics, 
targetSize, true)
       newPartitionSpecsSeq.zip(partitionSpecs).foreach(spec => spec._1 ++= 
spec._2)
     }

Review comment:
       How do we make sure we return at least one partition spec if there is no 
skew partition spec?




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