Github user marmbrus commented on a diff in the pull request: https://github.com/apache/spark/pull/1134#discussion_r14678162 --- Diff: sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/plans/joinTypes.scala --- @@ -23,3 +23,4 @@ case object LeftOuter extends JoinType case object RightOuter extends JoinType case object FullOuter extends JoinType case object LeftSemi extends JoinType +case object Skew extends JoinType --- End diff -- A key question for this PR is if we want to model skew as a join type. My first inclination would be no, since it is a hint about how to execute the query for maximum performance and not something that changes the answer of the query.
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