Github user yhuai commented on a diff in the pull request:
https://github.com/apache/spark/pull/5821#discussion_r29731639
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/Optimizer.scala
---
@@ -438,6 +439,17 @@ object CombineFilters extends Rule[LogicalPlan] {
}
/**
+ * Combines Limit and Sort if possible, so it will be planed as TakeOrdered
+ * and won't do total ordering.
+ */
+object CombineLimitSort extends Rule[LogicalPlan] {
--- End diff --
Will `LimitPushdown` be a better name?
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