[jira] [Created] (BEAM-2609) refine UDF interface

[Xu Mingmin (JIRA)]

Xu Mingmin created BEAM-2609:
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             Summary: refine UDF interface
                 Key: BEAM-2609
                 URL: https://issues.apache.org/jira/browse/BEAM-2609
             Project: Beam
          Issue Type: Task
          Components: dsl-sql
            Reporter: Xu Mingmin
            Assignee: Xu Mingmin


Some notes to improve UDF implementation:
1. let UDF to extend an interface;
2. keep one single method in a class;

[~takidau] [~xumingming]



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