Github user StefanRRichter commented on the issue:
https://github.com/apache/flink/pull/4353
I think that idea is problematic because in the rescaling case, all the
collections can have different sizes. For example there can be 5 managed keyed
state handles and 7 managed operator state handles and zero state handles for
the raw state. Then how would you split that up between the
`OperatorSubtaskStates` in your set? Like this, `OperatorSubtaskState` contains
the complete state for an operator subtask which I think is a good thing. Also
maybe at some point there *might* be a reason to report more than one handle
already on snapshotting.
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