Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/6780#discussion_r32293746
--- 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 --
Actually I'm think of adding a test for the whole batch. As this batch is
getting larger and larger, there are a lot more interactions between rules, we
should make sure there is no conflict between rules and rules are all at right
order.
cc @marmbrus @rxin
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