[jira] [Created] (FLINK-21843) Support StreamExecGroupWindowAggregate json ser/de

[Wenlong Lyu (Jira)]

Wenlong Lyu created FLINK-21843:
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             Summary: Support StreamExecGroupWindowAggregate json ser/de
                 Key: FLINK-21843
                 URL: https://issues.apache.org/jira/browse/FLINK-21843
             Project: Flink
          Issue Type: Sub-task
            Reporter: Wenlong Lyu






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