Github user marmbrus commented on a diff in the pull request: https://github.com/apache/spark/pull/1147#discussion_r15675477 --- Diff: sql/core/src/main/scala/org/apache/spark/sql/execution/joins.scala --- @@ -37,6 +37,135 @@ case object BuildLeft extends BuildSide @DeveloperApi case object BuildRight extends BuildSide +/** + * Constant Value for Binary Join Node + */ +object BinaryJoinNode { + val SINGLE_NULL_LIST = Seq[Row](null) + val EMPTY_NULL_LIST = Seq[Row]() +} + +// TODO If join key was null should be considered as equal? In Hive this is configurable. --- End diff -- I think this was mostly a bug that they were forced to continue supporting due to backwards compatibility.
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