Github user chenghao-intel commented on the pull request:
https://github.com/apache/spark/pull/4602#issuecomment-75419540
@yhuai please ignore my previous comment. I was thinking some other
possibilities.
I agree with you we can move the output column names into the logical plan
node `Generate`, but one thing that I am not sure if we need to provide the
ability of managing the default field names(if it's not specified) by the
`generator` expression itself.
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