Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/13765#discussion_r68577644
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/Optimizer.scala
---
@@ -547,6 +548,16 @@ object CollapseRepartition extends Rule[LogicalPlan] {
}
/**
+ * Combines adjacent [[RepartitionByExpression]] operators.
+ */
+object CollapseRepartitionBy extends Rule[LogicalPlan] {
+ def apply(plan: LogicalPlan): LogicalPlan = plan transformUp {
+ case RepartitionByExpression(exprs, RepartitionByExpression(_, child,
_), numPartitions) =>
--- End diff --
I think we can add more cases:
```
case RepartitionByExpression(exprs, Repartition(_, _, child),
numPartitions) =>
RepartitionByExpression(exprs, child, numPartitions)
case Repartition(numPartitions, _, r: RepartitionByExpression) =>
r.copy(numPartitions = numPartitions)
```
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