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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