Github user flyson commented on a diff in the pull request:
https://github.com/apache/spark/pull/10117#discussion_r46615751
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/Optimizer.scala
---
@@ -246,6 +247,16 @@ object ColumnPruning extends Rule[LogicalPlan] {
Project(projectList, Join(pruneJoinChild(left),
pruneJoinChild(right), joinType, condition))
+ // Eliminate unneeded attributes from either side of a Join.
+ case Project(projectList, Filter(predicates, Join(left, right,
joinType, condition))) =>
--- End diff --
I think this problem shouldn't occur in Aggregate since it's covered by the
pattern match:
case a @ Aggregate(_,_,child) if (child.outputSet -- a.references).nonempty.
As for Sort, I still need to think it over.
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