EnricoMi commented on code in PR #39754:
URL: https://github.com/apache/spark/pull/39754#discussion_r1700422787


##########
connector/connect/server/src/main/scala/org/apache/spark/sql/connect/planner/SparkConnectPlanner.scala:
##########
@@ -2422,6 +2422,9 @@ class SparkConnectPlanner(
     val keyColumn = TypedAggUtils.aggKeyColumn(ds.kEncoder, 
ds.groupingAttributes)
     val namedColumns = rel.getAggregateExpressionsList.asScala.toSeq
       .map(expr => transformExpressionWithTypedReduceExpression(expr, input))
+      // SPARK-42199: resolve these aggregate expressions only against 
dataAttributes
+      // this is to hide key column from expression resolution
+      .map(ScopedExpression(_, ds.dataAttributes))
       .map(toNamedExpression)

Review Comment:
   Not sure if it does, not sure how to test this either. Should this guarantee 
the scoped expression to have the same expression name: 
b7cf27d068ce274ba100e7ac990623b70917d0b7



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