Github user fhueske commented on the issue:
https://github.com/apache/flink/pull/3149
You are right @wuchong, we should break it down into two issues.
I also agree about the serialization. We should offer defaults for
primitives (`byte`, `short`, `int`, `long`, `boolean`, `float`, `double`) and a
set of common character encodings (UTF-8, ASCII, etc.) for `String`. Everything
else can be initially handled as `byte[]`, IMO.
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