sunchao commented on code in PR #55927:
URL: https://github.com/apache/spark/pull/55927#discussion_r3260171261
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sql/core/src/main/scala/org/apache/spark/sql/execution/joins/ShuffledJoin.scala:
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@@ -39,6 +54,9 @@ trait ShuffledJoin extends JoinCodegenSupport {
// We re-arrange the shuffle partitions to deal with skew join, and the
new children
// partitioning doesn't satisfy `ClusteredDistribution`.
UnspecifiedDistribution :: UnspecifiedDistribution :: Nil
+ } else if (canSpreadNullJoinKeys) {
+ ClusteredDistribution(leftKeys, allowNullKeySpreading = true) ::
Review Comment:
added a new feature flag and disabled it by default
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