Github user marmbrus commented on a diff in the pull request:
https://github.com/apache/spark/pull/8268#discussion_r37331657
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/Optimizer.scala
---
@@ -178,6 +179,10 @@ object ColumnPruning extends Rule[LogicalPlan] {
case a @ Aggregate(_, _, child) if (child.outputSet --
a.references).nonEmpty =>
a.copy(child = Project(a.references.toSeq, child))
+ // Eliminate attributes that are not needed to calculate the Generate.
+ case g: Generate if !g.join && (g.child.outputSet --
g.references).nonEmpty =>
--- End diff --
Can we also handle the join case when there is a project on top of the
generate (i.e. push the project through the generate)?
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