Github user rmetzger commented on the pull request:
https://github.com/apache/flink/pull/1437#issuecomment-162465233
The `KeyedDeserializationSchema` is a new interface introduced in 1.0. I
don't want to break the existing `DeserializationSchema` with the change.
Even before the change, the `KeyedDeserializationSchema` was exposing more
than the DeserialziationSchema (the offset), it can be seen as the Rich*
variant of the DeserSchema.
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