maropu commented on a change in pull request #28540:
URL: https://github.com/apache/spark/pull/28540#discussion_r428996754
##########
File path:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/joins.scala
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@@ -208,3 +208,161 @@ object ExtractPythonUDFFromJoinCondition extends
Rule[LogicalPlan] with Predicat
}
}
}
+
+sealed abstract class BuildSide
+
+case object BuildRight extends BuildSide
+
+case object BuildLeft extends BuildSide
+
+trait JoinSelectionHelper {
Review comment:
We need to pull out this functionality as a helper trait? For example,
`PredicateHelper` is used in many places, but this helper trait is only used
for `JoinSelection `?
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