cloud-fan commented on a change in pull request #23343: [SPARK-26390][SQL]
ColumnPruning rule should only do column pruning
URL: https://github.com/apache/spark/pull/23343#discussion_r242491795
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File path:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/Optimizer.scala
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@@ -602,17 +606,11 @@ object ColumnPruning extends Rule[LogicalPlan] {
p.copy(child = w.copy(
windowExpressions = w.windowExpressions.filter(p.references.contains)))
- // Eliminate no-op Window
- case w: Window if w.windowExpressions.isEmpty => w.child
-
- // Eliminate no-op Projects
- case p @ Project(_, child) if child.sameOutput(p) => child
-
// Can't prune the columns on LeafNode
case p @ Project(_, _: LeafNode) => p
// for all other logical plans that inherits the output from it's children
- case p @ Project(_, child) =>
+ case p @ Project(_, child) if !child.isInstanceOf[Project] =>
Review comment:
We already handled project over project at L542
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