Github user cloud-fan commented on the pull request:
https://github.com/apache/spark/pull/8755#issuecomment-140243693
Hi @davies , I think the idea of only transform expressions that defined in
`expressions` is not good enough. The key problem I see is we are using
`Attribute` to represent the output name and type. However, the type info is
already in `generator.elementTypes` and we only need names, i.e. use
`Seq[String]` instead of `Seq[Arrtibute]` for `generatorOutput`.
What do you think?
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