[jira] [Created] (FLINK-37316) Add StateManager#getStateOptional and StateManager#getState methods for DataStream V2

["xuhuang (Jira)" <ji...@apache.org>]

xuhuang created FLINK-37316:
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             Summary: Add StateManager#getStateOptional and StateManager#getState methods for DataStream V2
                 Key: FLINK-37316
                 URL: https://issues.apache.org/jira/browse/FLINK-37316
             Project: Flink
          Issue Type: New Feature
            Reporter: xuhuang


Currently, the `StateManager` only provides the `getState` method. Below is the method signature:

    /**
     * Get the specific list state.
     *
     * @param stateDeclaration of this state.
     * @return the list state corresponds to the state declaration.
     */
    <T> Optional<ListState<T>> getState(ListStateDeclaration<T> stateDeclaration) throws Exception;

In most scenarios, the `getState` method will return a non-empty instance. Therefore, we can consider providing another API that handles errors internally for users and returns the state directly, rather than wrapping it in an Optional.



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