Github user maropu commented on a diff in the pull request:
https://github.com/apache/spark/pull/21853#discussion_r204609622
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/Optimizer.scala
---
@@ -164,10 +164,20 @@ abstract class Optimizer(sessionCatalog:
SessionCatalog)
* Optimize all the subqueries inside expression.
*/
object OptimizeSubqueries extends Rule[LogicalPlan] {
+ private def removeTopLevelSorts(plan: LogicalPlan): LogicalPlan = {
--- End diff --
nit: `removeTopLevelSort`? (I think this func removes a single sort on the
top?)
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