Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/9348#discussion_r43367315
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/Optimizer.scala
---
@@ -417,6 +417,14 @@ 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 e @ In(v, list) => v match {
--- End diff --
We will group several rules into one batch, and execute one batch many
times. So the order doesn't matter, it may not match at the beginning, but
hopelly it can match in the next execution.
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