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https://issues.apache.org/jira/browse/ARROW-16211?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17613211#comment-17613211
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Joris Van den Bossche commented on ARROW-16211:
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> There is another case, where some set of UDFs are predefined and then
> referenced (e.g. by name) in incoming plans. In that scenario I think a
> nested registry is considerably less useful and the ability to unregister or
> override would be helpful.
Yes, and that is the use case that I was talking about (since that is what the
pyarrow register_scalar_function enabled you to do)
> [C++][Python] Unregister compute functions
> ------------------------------------------
>
> Key: ARROW-16211
> URL: https://issues.apache.org/jira/browse/ARROW-16211
> Project: Apache Arrow
> Issue Type: Sub-task
> Components: C++, Python
> Reporter: Vibhatha Lakmal Abeykoon
> Assignee: Vibhatha Lakmal Abeykoon
> Priority: Major
>
> In general, when using UDFs, the user defines a function expecting a
> particular outcome. When building the program, there needs to be a way to
> update existing function kernels if it expands beyond what is planned before.
> In such situations, there should be a way to remove the existing definition
> and add a new definition. To enable this, the unregister functionality has to
> be included.
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