Github user gatorsmile commented on a diff in the pull request:
https://github.com/apache/spark/pull/21403#discussion_r207701674
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/expressions.scala
---
@@ -505,6 +505,7 @@ object NullPropagation extends Rule[LogicalPlan] {
// If the value expression is NULL then transform the In expression
to null literal.
case In(Literal(null, _), _) => Literal.create(null, BooleanType)
+ case InSubquery(Seq(Literal(null, _)), _) => Literal.create(null,
BooleanType)
--- End diff --
Add a test case in OptimizeInSuite
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