Github user marmbrus commented on a diff in the pull request:
https://github.com/apache/spark/pull/956#discussion_r13521013
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/plans/logical/LogicalPlan.scala
---
@@ -101,7 +101,7 @@ abstract class LeafNode extends LogicalPlan with
trees.LeafNode[LogicalPlan] {
*/
abstract class Command extends LeafNode {
self: Product =>
- def output = Seq.empty
+ def output: Seq[Attribute] = Seq.empty // TODO: Is Seq.empty the right
thing to do?
--- End diff --
We should probably just remove this from command and actually set the
output correctly for its subclasses.
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