Github user hvanhovell commented on a diff in the pull request:
https://github.com/apache/spark/pull/15857#discussion_r87932525
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/expressions.scala
---
@@ -428,43 +428,47 @@ object FoldablePropagation extends Rule[LogicalPlan] {
}
case _ => Nil
})
+ val replaceFoldable: PartialFunction[Expression, Expression] = {
+ case a: AttributeReference if foldableMap.contains(a) =>
foldableMap(a)
+ }
if (foldableMap.isEmpty) {
plan
} else {
var stop = false
CleanupAliases(plan.transformUp {
- case u: Union =>
- stop = true
- u
- case c: Command =>
- stop = true
- c
- // For outer join, although its output attributes are derived from
its children, they are
- // actually different attributes: the output of outer join is not
always picked from its
- // children, but can also be null.
+ // Allow all leafnodes
--- End diff --
LeafNodes should not stop the folding process. That is what I am trying to
dat.
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