Github user marmbrus commented on a diff in the pull request:
https://github.com/apache/spark/pull/1151#discussion_r14277468
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/plans/logical/basicOperators.scala
---
@@ -89,6 +89,13 @@ case class Join(
}
}
+case class Except(left: LogicalPlan, right: LogicalPlan) extends
BinaryNode {
+ // TODO: These aren't really the same attributes as nullability etc
might change.
--- End diff --
You can remove this comment. Except does pass exactly the same attributes
through with no changes to nullability.
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