[jira] [Created] (FLINK-18201) Support create_function in Python Table API

[Shang Yuanchun (Jira)]

Dian Fu created FLINK-18201:
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             Summary: Support create_function in Python Table API
                 Key: FLINK-18201
                 URL: https://issues.apache.org/jira/browse/FLINK-18201
             Project: Flink
          Issue Type: Improvement
          Components: API / Python
            Reporter: Dian Fu
             Fix For: 1.12.0


There is an interface *createFunction* in the Java *TableEnvironment*. It's used to register a Java UserDefinedFunction class as a catalog function. We should also add such an interface in the Python *TableEnvironment*.



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