Github user JoshRosen commented on a diff in the pull request:
https://github.com/apache/spark/pull/11225#discussion_r53381730
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/Optimizer.scala
---
@@ -300,6 +300,16 @@ 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) =>
--- End diff --
The projection has as many expressions as there are output fields, which is
why this `zip` is safe.
The goal of this block is to keep only the expressions whose output columns
are referenced by the aggregate.
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