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

["Jeff Zhang (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/FLINK-11970?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16841013#comment-16841013 ] 

Jeff Zhang commented on FLINK-11970:
------------------------------------

[~yanghua] Any update on this ticket ?

> 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
>          Components: Table SQL / API
>            Reporter: Jeff Zhang
>            Assignee: vinoyang
>            Priority: Major
>
> 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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