cloud-fan commented on a change in pull request #33587:
URL: https://github.com/apache/spark/pull/33587#discussion_r682672784
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File path:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/Optimizer.scala
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@@ -518,7 +518,36 @@ object RemoveNoopOperators extends Rule[LogicalPlan] {
def apply(plan: LogicalPlan): LogicalPlan = plan.transformUpWithPruning(
_.containsAnyPattern(PROJECT, WINDOW), ruleId) {
// Eliminate no-op Projects
- case p @ Project(_, child) if child.sameOutput(p) => child
+ case p @ Project(projectList, child) if child.sameOutput(p) =>
+ val newChild = child match {
+ case p: Project =>
+ val newList = p.projectList.map {
Review comment:
shall we create a method to put this code piece?
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