Github user chenghao-intel commented on the pull request:

    https://github.com/apache/spark/pull/4602#issuecomment-75417555
  
    The `generator` is not like the normal expression, which can output 
multiple columns, in current implementation, the logical plan node `Generate` 
is for that purpose, instead of `Project`. I agree we need to improve that 
somehow, probably all we need is a more general logical plan node `Project`?


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