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All operators, as well as rich UDFs can be stateful. Previously, state can be lazily declared with a state descriptor any time during processing by using getRuntimeContext().getState(descriptor). Both concerns of state access as well as state registration is achieved addressed through the same call.

We propose to decompose this into 2 steps: (a) pre-flight (i.e. before the job graph is submitted) state descriptor registration, and (b) runtime access to registered state using the state ID only.

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