[GitHub] [spark] dongjoon-hyun commented on a change in pull request #33910: [SPARK-36666][SQL] Fix regression in AQEShuffleReadExec

[GitBox <gi...@apache.org>]

dongjoon-hyun commented on a change in pull request #33910:
URL: https://github.com/apache/spark/pull/33910#discussion_r702299692



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File path: sql/core/src/main/scala/org/apache/spark/sql/execution/adaptive/AQEShuffleReadExec.scala
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@@ -82,8 +82,11 @@ case class AQEShuffleReadExec private(
         // `RoundRobinPartitioning` but we don't need to retain the number of partitions.
         case r: RoundRobinPartitioning =>
           r.copy(numPartitions = partitionSpecs.length)
-        case other => throw new IllegalStateException(
-          "Unexpected partitioning for coalesced shuffle read: " + other)
+        case _ =>
+          // Spark plugins may have custom partitioning and may replace this operator
+          // during the postStageOptimization phase, so return UnknownPartitioning here
+          // rather than throw an exception
+          UnknownPartitioning(partitionSpecs.length)

Review comment:
       Thank you, @andygrove .




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