Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/11602#discussion_r55484809
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/Optimizer.scala
---
@@ -381,6 +381,10 @@ object ColumnPruning extends Rule[LogicalPlan] {
p
}
+ // Eliminate the child from the Projects with no references to its
child
+ case p @ Project(projectList, child) if
p.references.intersect(child.outputSet).isEmpty =>
--- End diff --
But this will change the number of rows right?
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