Github user gatorsmile commented on a diff in the pull request:
https://github.com/apache/spark/pull/11565#discussion_r55643000
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/Optimizer.scala
---
@@ -384,9 +374,25 @@ object ColumnPruning extends Rule[LogicalPlan] {
// Eliminate no-op Projects
case p @ Project(projectList, child) if sameOutput(child.output,
p.output) => child
+ // Eliminate no-op Window
+ case w: Window if sameOutput(w.child.output, w.output) => w.child
+
+ // Convert Aggregate to Project if no aggregate function exists
+ case a: Aggregate if !containsAggregates(a.expressions) =>
+ Project(a.aggregateExpressions, a.child)
--- End diff --
Anyway, I think this is a rare case. Will not do it in this PR
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