Github user mxm commented on the pull request:
https://github.com/apache/flink/pull/966#issuecomment-129826022
@StephanEwen @fhueske
The `Rich` prefix might seem a bit odd but it is a naming convention that
is consistent with the user-defined functions which have the RuntimeContext
available.
As for `abstract classes vs interface` I agree with @sachingoel0101 that it
makes sense to implement access to the RuntimeContext once for the user. We may
also add other "rich" functions; if we implemented that using an interface we
would have to change it later on or add another interface.
I think Input/Ouput formats should be "rich" by default. However, we might
not want to break the API for existing external implementations.
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