Github user mgaido91 commented on a diff in the pull request: https://github.com/apache/spark/pull/20560#discussion_r180664857 --- Diff: sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/Optimizer.scala --- @@ -733,6 +735,17 @@ object EliminateSorts extends Rule[LogicalPlan] { } } +/** + * Removes Sort operation if the child is already sorted + */ +object RemoveRedundantSorts extends Rule[LogicalPlan] { + def apply(plan: LogicalPlan): LogicalPlan = plan transform { + case Sort(orders, true, child) if child.outputOrdering.nonEmpty + && SortOrder.orderingSatisfies(child.outputOrdering, orders) => + child + } --- End diff -- Yes, you're right. Probably we can do this in other PR. May you open a JIRA for this? Thanks!
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