Github user marmbrus commented on a diff in the pull request:
https://github.com/apache/spark/pull/5358#discussion_r28199784
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/Optimizer.scala
---
@@ -171,8 +171,26 @@ object ColumnPruning extends Rule[LogicalPlan] {
Project(substitutedProjection, child)
+ case gen@Generate(_: Explode, _, _, _, c) =>
--- End diff --
Oh, I see. Sorry I did not look closely enough. In general we do this by
matching on a project that is above the node in question. This works because
projects will get pushed down or created in case where unneeded attributes
exist. There are other examples in this file where we do this.
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