[jira] [Created] (FLINK-21646) Support json serialization/deserialization for the states in StreamExecGroupAggregate

[Shang Yuanchun (Jira)]

godfrey he created FLINK-21646:
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             Summary: Support json serialization/deserialization for the states in StreamExecGroupAggregate
                 Key: FLINK-21646
                 URL: https://issues.apache.org/jira/browse/FLINK-21646
             Project: Flink
          Issue Type: Sub-task
            Reporter: godfrey he






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