cloud-fan commented on a change in pull request #34580:
URL: https://github.com/apache/spark/pull/34580#discussion_r749077669
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File path:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/expressions.scala
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@@ -681,7 +681,9 @@ object PushFoldableIntoBranches extends Rule[LogicalPlan]
with PredicateHelper {
if supportedUnaryExpression(u) &&
atMostOneUnfoldable(branches.map(_._2) ++ elseValue) =>
c.copy(
branches.map(e => e.copy(_2 = u.withNewChildren(Array(e._2)))),
- elseValue.map(e => u.withNewChildren(Array(e))))
+ elseValue
+ .orElse { if (u.isInstanceOf[IsNull]) Some(Literal(null,
c.dataType)) else None }
Review comment:
Can we optimize away the useless else branch? I think null propagation +
removing null else branch should do the work?
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