Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/9348#discussion_r43469995
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/Optimizer.scala
---
@@ -417,6 +417,11 @@ object NullPropagation extends Rule[LogicalPlan] {
case left :: Literal(null, _) :: Nil => Literal.create(null,
e.dataType)
case _ => e
}
+
+ // If the value expression is NULL then transform the In expression
to
+ // Literal(null)
+ case In(Literal(null, _), list) => Literal.create(null, BooleanType)
--- End diff --
For someone read this PR in the future: we don't need to handle `InSet`
here, because `InSet` requires `list` expressions are all literals, so if the
`value` expression is null literal, the whole `InSet` is foldable and will be
optimized into literal null.
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