Github user aljoscha commented on the issue:
https://github.com/apache/flink/pull/2768
@shixiaogang you can also do that, but then the machinery in
`SimpleStateDescriptor` is only used by `ValueStateDescriptor` because this is
really the only descriptor that has a default value. (In my original
implementation it was like this and only `ValueStateDescriptor` had the
serialisation logic and a default value.)
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