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https://issues.apache.org/jira/browse/ARROW-9865?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17198826#comment-17198826
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Paul Taylor commented on ARROW-9865:
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Arrow Vectors are immutable, it's not possible to append new elements once
they've been constructed. You can however construct a new Arrow Vector with
additional elements via the Builder classes (or related high-level
`Vector.from()` convenience methods).
> How to Update a Dictionary - Examples needed
> --------------------------------------------
>
> Key: ARROW-9865
> URL: https://issues.apache.org/jira/browse/ARROW-9865
> Project: Apache Arrow
> Issue Type: Improvement
> Components: JavaScript, Python
> Reporter: Alex Monahan
> Priority: Major
>
> How can I do an in-place update on a specific value in a dictionary encoded
> column in an Arrow Table?
>
> I have searched all issues and all of the documentation that I can find, and
> I still can't figure out how to add a new item to a dictionary. The new item
> I would like to add is different than any previously added value, so it is
> not already in the dictionary keys. Is this possible?
> I am working in the JS client, but a Python example may be enough to point me
> in the right direction.
>
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