Github user marmbrus commented on a diff in the pull request:
https://github.com/apache/spark/pull/5358#discussion_r32376589
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/Optimizer.scala
---
@@ -171,6 +172,10 @@ object ColumnPruning extends Rule[LogicalPlan] {
Project(substitutedProjection, child)
+ // add a project which is blocked by Generate
+ case p @ pushBelowGenerate(newChild) =>
--- End diff --
Just look for Project on top of generate instead of attempting to walk the
query tree. You can assume other rules will push projects down to you.
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