[jira] [Created] (FLINK-5023) Add get() method in State interface

[Shang Yuanchun (Jira)]

Xiaogang Shi created FLINK-5023:
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             Summary: Add get() method in State interface
                 Key: FLINK-5023
                 URL: https://issues.apache.org/jira/browse/FLINK-5023
             Project: Flink
          Issue Type: Improvement
          Components: State Backends, Checkpointing
            Reporter: Xiaogang Shi


Currently, the only method provided by the State interface is `clear()`. I think we should provide another method called `get()` to return the structured value (e.g., value, list, or map) under the current key.

In fact, the functionality of `get()` has already been implemented in all types of states: e.g., `value()` in ValueState and `get()` in ListState. The modification to the interface can better abstract these states.



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