andygrove commented on code in PR #1744:
URL: https://github.com/apache/datafusion-comet/pull/1744#discussion_r2096114350


##########
spark/src/main/scala/org/apache/comet/serde/QueryPlanSerde.scala:
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@@ -2518,6 +2518,15 @@ object QueryPlanSerde extends Logging with CometExprShim 
{
           return None
         }
 
+        if (groupingExpressions.exists(expr =>

Review Comment:
   Spark 3.x supports grouping by structs and arrays and we already have tests 
passing for those cases. Grouping by map is new in Spark 4.



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