[jira] [Created] (FLINK-6457) Clean up ScalarFunction interface

[Shang Yuanchun (Jira)]

Ruidong Li created FLINK-6457:
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             Summary: Clean up ScalarFunction interface
                 Key: FLINK-6457
                 URL: https://issues.apache.org/jira/browse/FLINK-6457
             Project: Flink
          Issue Type: Improvement
            Reporter: Ruidong Li
            Assignee: Ruidong Li


clean up ScalarFunction interface



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