holdenk commented on code in PR #45146:
URL: https://github.com/apache/spark/pull/45146#discussion_r1552860812
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sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/Optimizer.scala:
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@@ -1817,26 +1817,32 @@ object PushPredicateThroughNonJoin extends
Rule[LogicalPlan] with PredicateHelpe
case filter @ Filter(condition, union: Union) =>
// Union could change the rows, so non-deterministic predicate can't be
pushed down
+ val output = union.output
val (pushDown, stayUp) =
splitConjunctivePredicates(condition).partition(_.deterministic)
if (pushDown.nonEmpty) {
val pushDownCond = pushDown.reduceLeft(And)
- val output = union.output
Review Comment:
Maybe, I was looking at union, output is a slightly non-trivial computation
and we look into it many times?
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