[jira] [Created] (FLINK-11970) TableEnvironment#registerFunction should overwrite if the same name function existed.

[Shang Yuanchun (Jira)]

Jeff Zhang created FLINK-11970:
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             Summary: TableEnvironment#registerFunction should overwrite if the same name function existed.
                 Key: FLINK-11970
                 URL: https://issues.apache.org/jira/browse/FLINK-11970
             Project: Flink
          Issue Type: Improvement
            Reporter: Jeff Zhang


Currently, it would throw exception if I try to register user function multiple times. Registering udf multiple times is very common usage in notebook scenario. And I don't think it would cause issues for users.

e.g. If user happened to register the same udf multiple times (he intend to register 2 different udf actually), then he would get exception at runtime where he use the udf that is missing registration.



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