List<List<T>> repartitionState(List<List<T>> previousParallelSubtaskStates, int oldParallelism, int newParallelism)
previousParallelSubtaskStates- List with one entry of state handles per parallel subtask of an operator, as they have been checkpointed.
oldParallelism- The parallelism before we start redistribution.
newParallelism- The parallelism that we consider for the state redistribution. Determines the size of the returned list.
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