Github user chenghao-intel commented on the pull request:
https://github.com/apache/spark/pull/4186#issuecomment-72141501
@scwf Sorry, I didn't make it clearer, my original idea is:
1) Create a `MultiAlias` (like the `UnresolvedAttribute`), and it carrys
the `Expression` and multiple aliases.
2) Resolve the `MultiAlias` during analyzing, and create the real UDTF and
set the aliases for UDTF.
3) We also need to `CheckResolution`, only single UDTF supported for
`SELECT` clause.
The reason I want to eliminate the `MultiAlias` is, all of the `Generator`
(UDTF) function actually supports multiple names, the only thing we need to do
is passing the right alias names to them (during the analyzing).
What do you think?
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