Github user marmbrus commented on the pull request:

    https://github.com/apache/spark/pull/10052#issuecomment-160874509
  
    Thanks for working on this.  This seems resonable to support, but I have 
two suggestions:
     - I would probably implement this as a rule in the 
[`Analyzer`](https://github.com/apache/spark/blob/master/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/Analyzer.scala)
 so that it is not specific to the Hive parser.
     - Please add a unit test, probably in `SQLQuerySuite`


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