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https://issues.apache.org/jira/browse/FLINK-18201?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17134052#comment-17134052
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Timo Walther commented on FLINK-18201:
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We don't allow {{void createFunction(String path, UserDefinedFunction
userDefinedFunction)}}. Instances should only be registered as temporary
functions. We advocate classes for catalogs instead {{void
createFunction(String path, Class<UserDefinedFunction> userDefinedFunction)}}
because classes are easier to persistent than instances.
> Support create_function in Python Table API
> -------------------------------------------
>
> Key: FLINK-18201
> URL: https://issues.apache.org/jira/browse/FLINK-18201
> Project: Flink
> Issue Type: Improvement
> Components: API / Python
> Reporter: Dian Fu
> Assignee: Nicholas Jiang
> Priority: Major
> Fix For: 1.12.0
>
>
> There is an interface *createFunction* in the Java *TableEnvironment*. It's
> used to register a Java UserDefinedFunction class as a catalog function. We
> should align the Python Table API with Java and add such an interface in the
> Python *TableEnvironment*.
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