peter-toth commented on code in PR #55927:
URL: https://github.com/apache/spark/pull/55927#discussion_r3261128231
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sql/core/src/main/scala/org/apache/spark/sql/execution/joins/ShuffledJoin.scala:
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@@ -28,6 +28,21 @@ import
org.apache.spark.sql.catalyst.plans.physical.{ClusteredDistribution, Dist
trait ShuffledJoin extends JoinCodegenSupport {
def isSkewJoin: Boolean
+ private def containsNullSafeJoinMarker(keys: Seq[Expression]): Boolean = {
+ keys.exists(_.exists(_.isInstanceOf[IsNull]))
+ }
+
+ private lazy val canSpreadNullJoinKeys: Boolean = {
Review Comment:
Please don't forget to update the PR description and let's leave some
comments here why spreading nulls is safe in <=> outer joins.
I wonder if left anti join could also benefit from the feature.
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