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