Github user yhuai commented on the pull request:
https://github.com/apache/spark/pull/4602#issuecomment-74807564
@chenghao-intel After another look of the code, I think it may be better to
remove aliases from the `generator`. Then, `MultiAlias` can be used to assign
the names to the output fields of a generator. Because a `Generator` is just an
`Expression`, seems it is not a good idea to put names in it. Instead, using an
`NamedExpression` (e.g. `MultiAlias`) to wrap a `Generator` looks like a better
approach.
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