Github user OopsOutOfMemory commented on the pull request:

    https://github.com/apache/spark/pull/3837#issuecomment-68424203
  
    Hi. @scwf 
    Although T-SQL support it. But I'm afraid this is not a good syntax. 
    Sometimes this will cause code hard to read and make people confused.
    See: 
http://weblogs.sqlteam.com/jeffs/archive/2007/08/30/string-literal-alias-sql-server.aspx



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