Github user StephanEwen commented on the issue:
https://github.com/apache/flink/pull/5939
The feature is a nice addition.
Flink currently already adds the timestamp as the record's event time
timestamp. You can access it via a ProcessFunction. That is a tad bit more
clumsy, though...
If we want to have the timestamp as part of the Deserialization Schema, I
would suggest to not add yet another specialized schema, but extend the
KeyedDeserializationSchema with another method that takes the timestamp. We
should make that a default method that calls the existing method and make the
existing method an empty default method.
We could also think about renaming `KeyedDeserializationSchema` to
`RichDeserializationSchema` or so, if that would describe the functionality
better (I am not a native speaker, so would be nice for one to give their
opinion here).
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