Github user scwf commented on a diff in the pull request:
https://github.com/apache/spark/pull/5821#discussion_r29731959
--- 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 --
i think CombineLimitSort is more descriptive now, since this is single and
special case of combine limit and sort.
we can rename it in future when there are more push down cases we add here
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