cloud-fan commented on code in PR #39640:
URL: https://github.com/apache/spark/pull/39640#discussion_r1073390916


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sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/plans/logical/object.scala:
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@@ -396,6 +396,25 @@ object MapGroups {
       UnresolvedDeserializer(encoderFor[T].deserializer, dataAttributes),
       groupingAttributes,
       dataAttributes,
+      Seq.empty,

Review Comment:
   shall we just add a new parameter `dataOrder: Seq[SortOrder]` with default 
value Nil?



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