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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