[jira] [Created] (FLINK-20086) Add documentation for the open method in UserDefinedFunction

[Shang Yuanchun (Jira)]

Dian Fu created FLINK-20086:
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             Summary: Add documentation for the open method in UserDefinedFunction
                 Key: FLINK-20086
                 URL: https://issues.apache.org/jira/browse/FLINK-20086
             Project: Flink
          Issue Type: Improvement
          Components: API / Python, Documentation
            Reporter: Dian Fu
             Fix For: 1.12.0, 1.11.3


According to the questions asked by PyFlink users so far, many users are not aware that there is a open method in UserDefinedFunction where they could perform initialization work. This method is especially useful for ML users where they could do ML mode initialization.



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