Github user gatorsmile commented on a diff in the pull request:
https://github.com/apache/spark/pull/20560#discussion_r178327166
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/plans/logical/LogicalPlan.scala
---
@@ -219,6 +219,11 @@ abstract class LogicalPlan
* Refreshes (or invalidates) any metadata/data cached in the plan
recursively.
*/
def refresh(): Unit = children.foreach(_.refresh())
+
+ /**
+ * If the current plan contains sorted data, it contains the sorted
order.
+ */
+ def sortedOrder: Seq[SortOrder] = Nil
--- End diff --
`def outputOrdering`?
---
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