cloud-fan commented on a change in pull request #29181:
URL: https://github.com/apache/spark/pull/29181#discussion_r459470276



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File path: 
sql/core/src/main/scala/org/apache/spark/sql/execution/joins/HashJoin.scala
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@@ -54,6 +54,8 @@ trait HashJoin extends BaseJoinExec {
 
   override def outputPartitioning: Partitioning = 
streamedPlan.outputPartitioning
 
+  override def outputOrdering: Seq[SortOrder] = streamedPlan.outputOrdering

Review comment:
       to be future-proof, we should only do it if the join type allows us to 
do so. It's fragile to rely on what the join type can be in hash join.




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