Github user StephanEwen commented on the issue:
https://github.com/apache/flink/pull/2305
I just thought of a different trick: We could add a second variant of the
`apply(..)` function (for example called `with(...)` as in the DataSet API) and
have the proper return type there (calling apply() and cast).
We can then immediately deprecate the `with()` function to indicate that it
is a temporary workaround and is to be replaced by `apply(...)` in Flink 2.0.
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