[jira] [Created] (FLINK-20623) Separate the implementation of StreamExecWatermarkAssigner

[Shang Yuanchun (Jira)]

godfrey he created FLINK-20623:
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             Summary: Separate the implementation of StreamExecWatermarkAssigner
                 Key: FLINK-20623
                 URL: https://issues.apache.org/jira/browse/FLINK-20623
             Project: Flink
          Issue Type: Sub-task
          Components: Table SQL / Planner
            Reporter: godfrey he






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