Github user yhuai commented on a diff in the pull request:
https://github.com/apache/spark/pull/10844#discussion_r51548751
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/plans/logical/LogicalPlan.scala
---
@@ -301,10 +301,12 @@ abstract class LeafNode extends LogicalPlan {
/**
* A logical plan node with single child.
*/
-abstract class UnaryNode extends LogicalPlan {
+abstract class UnaryNode extends LogicalPlan with PredicateHelper {
--- End diff --
Looks like we do not need `PredicateHelper` at here? Maybe it is better to
just `with PredicateHelper` for `Filter`?
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