Github user henryr commented on a diff in the pull request:
https://github.com/apache/spark/pull/20560#discussion_r179003707
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/plans/logical/LogicalPlan.scala
---
@@ -274,3 +279,7 @@ abstract class BinaryNode extends LogicalPlan {
override final def children: Seq[LogicalPlan] = Seq(left, right)
}
+
+abstract class KeepOrderUnaryNode extends UnaryNode {
--- End diff --
`OrderPreservingUnaryNode`? Or perhaps do you think this would be better
modeled as a mixin trait?
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