Github user scwf commented on the pull request:
https://github.com/apache/spark/pull/4186#issuecomment-71404705
@chenghao-intel, actually i have considered your solution and why i use
this one is that only UDTF support multi alias in my decription and maybe a
liitle redundancy to add a new node for it.
But as you said, this one is a little hacky, so i will change it to the
solution you suggested to make it more clear, thanks:)
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