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https://issues.apache.org/jira/browse/ARROW-9150?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17138462#comment-17138462
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Daniel Nugent commented on ARROW-9150:
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Yes, looks like. Sorry, I think I searched for "concat" rather than
"concatenate" when looking for an existing issue.
> Support Dictionary Unification with Concatenate
> -----------------------------------------------
>
> Key: ARROW-9150
> URL: https://issues.apache.org/jira/browse/ARROW-9150
> Project: Apache Arrow
> Issue Type: Improvement
> Components: C++
> Reporter: Daniel Nugent
> Priority: Minor
>
> Seems to be supported through arrow to pandas conversions at the moment. I
> *believe* the DictionaryUnifier could be leveraged for this.
> Not sure if there are unintended consequences, but the NYI implies that this
> is desired. Didn't see an open issue for it already.
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