Github user StephanEwen commented on the issue:
https://github.com/apache/flink/pull/3142
In a separate change, we actually deprecated the default value in states.
It does not behave very well at runtime in many cases and we thought that it
would be simpler to let the user code handle default values.
Can queryable state not simply return null as well? I am also not sure if
the assumption can be made that external queries want the same default value as
the state updating code paths (which frequently use the default value only as a
shortcut for initializing the state).
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