Github user rxin commented on a diff in the pull request:
https://github.com/apache/spark/pull/6405#discussion_r31194704
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/Expression.scala
---
@@ -106,6 +110,10 @@ abstract class LeafExpression extends Expression with
trees.LeafNode[Expression]
abstract class UnaryExpression extends Expression with
trees.UnaryNode[Expression] {
self: Product =>
+
+ override def foldable: Boolean = child.foldable
--- End diff --
same for nulalble
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