Github user liancheng commented on a diff in the pull request:
https://github.com/apache/spark/pull/13765#discussion_r69930648
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/Optimizer.scala
---
@@ -537,12 +537,19 @@ object CollapseProject extends Rule[LogicalPlan] {
}
/**
- * Combines adjacent [[Repartition]] operators by keeping only the last
one.
+ * Combines adjacent [[Repartition]] and [[RepartitionByExpression]]
operator combinations
+ * by keeping only the one.
--- End diff --
> ... by only keeping the top-level one.
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