Github user rxin commented on a diff in the pull request:
https://github.com/apache/spark/pull/10476#discussion_r49406403
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/Optimizer.scala
---
@@ -287,6 +288,17 @@ object ColumnPruning extends Rule[LogicalPlan] {
}
/**
+ * Combines the adjacent [[Project]] and [[Join]] operators, iff their
output sets are the same.
+ */
+object CombineProjectJoin extends Rule[LogicalPlan] {
+
+ def apply(plan: LogicalPlan): LogicalPlan = plan transformUp {
+ case p @ Project(_, j: Join)
+ if j.outputSet == p.outputSet => j
--- End diff --
why is this specific to join?
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