Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/20560#discussion_r179043661
--- 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 operations on already sorted data
+ */
+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) =>
--- End diff --
shall we do it after planning as we already have `SparkPlan.
outputOrdering`?
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