Github user smola commented on the pull request:
https://github.com/apache/spark/pull/6463#issuecomment-106525540
This is still a work in progress.
@rxin I would like some feedback about how to continue with the
implementation. In ExpressionBuilders I added some helper methods that can
convert a Expression into a function name and a function builder (i.e.
`(Seq[Expression]) => Expression`). I added two alternative implementations,
one with macros and one with reflection. How does it look?
Any other feedback will be really appreciated. Thanks.
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