Github user liancheng commented on a diff in the pull request: https://github.com/apache/spark/pull/6780#discussion_r32302799 --- Diff: sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/Optimizer.scala --- @@ -39,11 +39,12 @@ object DefaultOptimizer extends Optimizer { Batch("Distinct", FixedPoint(100), ReplaceDistinctWithAggregate) :: Batch("Operator Optimizations", FixedPoint(100), - UnionPushdown, + UnionPushDown, CombineFilters, PushPredicateThroughProject, PushPredicateThroughGenerate, ColumnPruning, + LimitPushDown, --- End diff -- Rules within a single batch shouldn't be sensitive to execution order. Especially for `FixedPoint` batches.
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