Github user concretevitamin commented on the pull request:

    https://github.com/apache/spark/pull/1346#issuecomment-50423851
  
    To add to this: for my own purpose, I can certainly hack something together 
based off this branch in a custom Spark build, but just want to throw this 
thought out there as I think it does have some generality (large number of 
columns, avoid writing `.map(p => Row(p(0), p(1), ..., p(LARGE_NUM)))`).


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