Github user ueshin commented on a diff in the pull request:
https://github.com/apache/spark/pull/990#discussion_r13576722
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/Optimizer.scala
---
@@ -154,6 +155,10 @@ object NullPropagation extends Rule[LogicalPlan] {
case left :: Literal(null, _) :: Nil => Literal(null, e.dataType)
case _ => e
}
+ case e: CaseConversionExpression => e.children match {
--- End diff --
Ok, I do.
BTW, I noticed that there are some Expressions in the same situation like
`UnaryMinus`, `Cast`, or `Not`, ( or `BinaryArithmetic`, `BinaryComparison`,
`StringRegexExpression`, too ? )
I think they also can be handled by constant folding.
What do you think?
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