Github user shixiaogang commented on the issue:
https://github.com/apache/flink/pull/2768
I moved default value from `SimpleStateDescriptor` to
`ValueStateDescriptor`. Now only `ValueStateDescriptor`s have default values.
The serialization methods may contain some duplicated code, but i think it's
acceptable.
I also modify the implementation of `HeapReducingState`s. The first value
will be copied before being put into the heap.
@aljoscha What do you think of these changes?
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