LantaoJin commented on a change in pull request #29021:
URL: https://github.com/apache/spark/pull/29021#discussion_r456318955
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File path:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/plans/physical/partitioning.scala
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@@ -340,3 +340,28 @@ case class BroadcastPartitioning(mode: BroadcastMode)
extends Partitioning {
case _ => false
}
}
+
+/**
Review comment:
`CoalescedHashPartitioning` can satisfy the `ClusteredDistribution`
because a skew join may match the case which contains Aggregation (non-skew
side). `UnknownPartitioning` cannot satisfy `ClusteredDistribution` and add an
additional shuffle.
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