Github user yhuai commented on a diff in the pull request:
https://github.com/apache/spark/pull/5972#discussion_r29911856
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/predicates.scala
---
@@ -110,6 +110,7 @@ case class InSet(value: Expression, hset: Set[Any])
override def children: Seq[Expression] = value :: Nil
+ override def foldable: Boolean = true
--- End diff --
I believe that you want `override def foldable: Boolean = value.foldable`.
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