Github user viirya commented on a diff in the pull request: https://github.com/apache/spark/pull/20069#discussion_r159141412 --- 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 -- What does it mean "after the first non-deterministic"? Doesn't this simply partition predicates to deterministic and non-deterministic? Have it considered "first" non-deterministic?
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