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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