Github user jinxing64 commented on a diff in the pull request:
https://github.com/apache/spark/pull/20069#discussion_r160910495
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/Optimizer.scala
---
@@ -851,7 +851,7 @@ object PushDownPredicate extends Rule[LogicalPlan] with
PredicateHelper {
case filter @ Filter(condition, union: Union) =>
// Union could change the rows, so non-deterministic predicate can't
be pushed down
- val (pushDown, stayUp) =
splitConjunctivePredicates(condition).span(_.deterministic)
+ val (pushDown, stayUp) =
splitConjunctivePredicates(condition).partition(_.deterministic)
--- End diff --
@viirya
IIUC, with `span`, the deterministic predicates after the first
non-deterministic will not be pushed down, but with `partition`, all
deterministic predicates will be pushed down.
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