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https://issues.apache.org/jira/browse/ARROW-16211?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17614178#comment-17614178
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Weston Pace commented on ARROW-16211:
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I'm +1 on Yaron's points regarding safety.
Use cases:
* Adding extra functions for unit tests (the original motivation for this
particular JIRA I think)
Solution: Create a nested registry for the unit tests
* User wants to predefine a bunch of UDFs that will last for the duration of
the process
Solution: Replace the default registry with a nested registry based on the old
default registry
* User wants plan-specific UDFs
Solution: Nested registry for the plan based on the default registry
> [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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