viirya commented on a change in pull request #28556:
URL: https://github.com/apache/spark/pull/28556#discussion_r428520430



##########
File path: 
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/NestedColumnAliasing.scala
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@@ -82,6 +87,8 @@ object NestedColumnAliasing {
     case _: LocalLimit => true
     case _: Repartition => true
     case _: Sample => true
+    case _: RepartitionByExpression => true
+    case _: Join => true

Review comment:
       Added some tests for outer join.




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