Github user rxin commented on a diff in the pull request:
https://github.com/apache/spark/pull/5821#discussion_r29486702
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/Optimizer.scala
---
@@ -618,6 +618,9 @@ object CombineLimits extends Rule[LogicalPlan] {
def apply(plan: LogicalPlan): LogicalPlan = plan transform {
case ll @ Limit(le, nl @ Limit(ne, grandChild)) =>
Limit(If(LessThan(ne, le), ne, le), grandChild)
+
+ case s @ Sort(_, _, Limit(exp, grandChild)) =>
--- End diff --
maybe add some explanation saying it is more efficient because it is
expensive to do total ordering in distributed setting.
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