Github user davies commented on a diff in the pull request:
https://github.com/apache/spark/pull/11256#discussion_r53663946
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/Optimizer.scala
---
@@ -300,97 +300,71 @@ object SetOperationPushDown extends Rule[LogicalPlan]
with PredicateHelper {
*/
object ColumnPruning extends Rule[LogicalPlan] {
def apply(plan: LogicalPlan): LogicalPlan = plan transform {
- case a @ Aggregate(_, _, e @ Expand(projects, output, child))
- if (e.outputSet -- a.references).nonEmpty =>
- val newOutput = output.filter(a.references.contains(_))
- val newProjects = projects.map { proj =>
- proj.zip(output).filter { case (e, a) =>
+ // Prunes the unused columns from project list of
Project/Aggregate/Window/Expand
+ case p @ Project(_, p2: Project) if (p2.outputSet --
p.references).nonEmpty =>
--- End diff --
CollapseProject can't remove the unused columns.
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