[GitHub] [spark] dongjoon-hyun commented on pull request #31811: [SPARK-34719][SQL][3.0] Fail if the view query has duplicated column names

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

dongjoon-hyun commented on pull request #31811:
URL: https://github.com/apache/spark/pull/31811#issuecomment-796861669


   cc @viirya since this is a correctness issue which is a blocker for Apache Spark 2.4.8.
   ```
   scala> sql("create view c(x, y) as select 1 a, 2 a")
   res1: org.apache.spark.sql.DataFrame = []
   
   scala> sql("select * from c").show
   +---+---+
   |  x|  y|
   +---+---+
   |  1|  1|
   +---+---+
   
   scala> spark.version
   res3: String = 2.4.7
   ```


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