Github user davies commented on a diff in the pull request:
https://github.com/apache/spark/pull/11745#discussion_r56743896
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/Optimizer.scala
---
@@ -91,6 +92,10 @@ abstract class Optimizer extends
RuleExecutor[LogicalPlan] {
SimplifyCasts,
SimplifyCaseConversionExpressions,
EliminateSerialization) ::
+ // Because ColumnPruning is called after PushPredicateThroughProject,
the predicate push down
+ // is reversed. This batch is to ensure Filter is pushed below
Project, if possible.
+ Batch("Push Predicate Through Project", Once,
+ PushPredicateThroughProject) ::
--- End diff --
Put this role in a separate batch is not correct, some other filter push
down rules depend on this one.
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