Github user marmbrus commented on a diff in the pull request:
https://github.com/apache/spark/pull/5770#discussion_r29398347
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/Optimizer.scala
---
@@ -36,6 +36,13 @@ object DefaultOptimizer extends Optimizer {
// SubQueries are only needed for analysis and can be removed before
execution.
Batch("Remove SubQueries", FixedPoint(100),
EliminateSubQueries) ::
+ Batch("Filter Pushdown", FixedPoint(100),
+ UnionPushdown,
+ CombineFilters,
+ PushPredicateThroughProject,
+ PushPredicateThroughJoin,
+ PushPredicateThroughGenerate,
+ ColumnPruning) ::
Batch("Combine Limits", FixedPoint(100),
CombineLimits) ::
--- End diff --
Instead, can we just move `CombineLimits` down into the `Filter Pushdown`
batch?
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