AngersZhuuuu commented on a change in pull request #25878:
[SPARK-29162][SQL]Simplify NOT(IsNull(x)) and NOT(IsNotNull(x))
URL: https://github.com/apache/spark/pull/25878#discussion_r326878243
##########
File path:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/expressions.scala
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@@ -461,6 +461,9 @@ object SimplifyConditionals extends Rule[LogicalPlan] with
PredicateHelper {
} else {
e.copy(branches = branches.take(i).map(branch => (branch._1,
elseValue)))
}
+
+ case n @ Not(expr: IsNull) => IsNotNull(expr.child)
Review comment:
> conditional
Reasonable, I focus too much on `isnull/isnotnull` expression。
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