Github user davies commented on a diff in the pull request:
https://github.com/apache/spark/pull/11682#discussion_r56459598
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/Optimizer.scala
---
@@ -410,6 +401,24 @@ object ColumnPruning extends Rule[LogicalPlan] {
}
/**
+ * Eliminate no-op Project and Window.
+ *
+ * Note: this rule should be executed just after ColumnPruning.
+ */
+object EliminateOperators extends Rule[LogicalPlan] {
+ def apply(plan: LogicalPlan): LogicalPlan = plan transformUp {
--- End diff --
This is not what we want, it cause that we can't prune columsn for
Filter(Join()).
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