Github user twalthr commented on the pull request:
https://github.com/apache/flink/pull/1556#issuecomment-176157407
As far as I know the `Expressions` are for the user-facing API only, right?
I think we won't need the `RexToExpr` class anymore, as I am currently writing
a rex to code generator.
You have implemented `Function` with row types by default. In the old Table
API we also generated these functions in order to not only support row types.
In the future we could also use Tuple type where possible to improve the
performance. Do we want lose this possibility?
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