[GitHub] [spark] cloud-fan commented on a change in pull request #30788: [SPARK-33726][SQL] Fix for Duplicate field names during Aggregation

[GitBox <gi...@apache.org>]

cloud-fan commented on a change in pull request #30788:
URL: https://github.com/apache/spark/pull/30788#discussion_r562467173



##########
File path: sql/core/src/test/scala/org/apache/spark/sql/DataFrameAggregateSuite.scala
##########
@@ -1079,6 +1079,16 @@ class DataFrameAggregateSuite extends QueryTest
     assert(aggs.head.output.map(_.dataType.simpleString).head ===
       aggs.last.output.map(_.dataType.simpleString).head)
   }
+
+  test("SPARK-33726: Aggregation on a table where a column name is reused") {
+    val query =
+      """|with T as (select id as a, -id as x from range(3)), U as (select id as b,

Review comment:
       let's properly format the SQL
   ```
   with t(
     ...)
   SELECT ...
   FROM ... JOIN ...
   GROUP BY ...
   ```




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