aokolnychyi commented on a change in pull request #29089:
URL: https://github.com/apache/spark/pull/29089#discussion_r454024892
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File path:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/Optimizer.scala
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@@ -981,6 +982,10 @@ object EliminateSorts extends Rule[LogicalPlan] {
j.copy(left = recursiveRemoveSort(originLeft), right =
recursiveRemoveSort(originRight))
case g @ Aggregate(_, aggs, originChild) if isOrderIrrelevantAggs(aggs) =>
g.copy(child = recursiveRemoveSort(originChild))
+ case r: RepartitionByExpression =>
Review comment:
I am +1 on having a repartition node that preserves ordering. In fact,
we have such a node internally. `Coalesce` is not really order preserving,
though. It has custom logic in `DefaultPartitionCoalescer` that gets applied if
the parent RDD has locality info. We would also need to report `outputOrdering`
correctly (which is not done in case of `Coalesce` now)
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