hsiang-c commented on code in PR #4727:
URL: https://github.com/apache/datafusion-comet/pull/4727#discussion_r3476495208


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spark/src/main/scala/org/apache/spark/sql/comet/operators.scala:
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@@ -1892,19 +1892,19 @@ object CometObjectHashAggregateExec
   }
 
   /**
-   * For Partial mode aggregates containing TypedImperativeAggregate functions 
(like CollectSet),
-   * the Spark-side output declares buffer columns as BinaryType (since Spark 
serializes state to
-   * binary). However, the native Comet aggregate produces the actual state 
type (e.g.,
-   * ArrayType(elementType) for CollectSet). This method corrects the output 
schema to match the
-   * native state types so the shuffle exchange schema is consistent with the 
actual data.
+   * For intermediate aggregates containing TypedImperativeAggregate functions 
(like CollectSet or

Review Comment:
   👍 Could we add a few SQL file tests: 
https://datafusion.apache.org/comet/contributor-guide/sql-file-tests.html#sql-file-tests,
 thank you!



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