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From "Jeff Zhang (JIRA)" <j...@apache.org>
Subject [jira] [Created] (FLINK-11970) TableEnvironment#registerFunction should overwrite if the same name function existed.
Date Wed, 20 Mar 2019 05:38:00 GMT
Jeff Zhang created FLINK-11970:
----------------------------------

             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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