Github user mgaido91 commented on a diff in the pull request: https://github.com/apache/spark/pull/21184#discussion_r201957701 --- Diff: sql/core/src/test/scala/org/apache/spark/sql/DataFrameSuite.scala --- @@ -2265,4 +2266,15 @@ class DataFrameSuite extends QueryTest with SharedSQLContext { val df = spark.range(1).select($"id", new Column(Uuid())) checkAnswer(df, df.collect()) } + + test("SPARK-24051: using the same alias can produce incorrect result") { --- End diff -- yes, without the change the result is: ``` +---+---+---+ | a| b| n| +---+---+---+ | 1| 0| 2| | 2| 0| 2| | 3| 0| 1| +---+---+---+ ```
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