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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