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https://issues.apache.org/jira/browse/ARROW-10403?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Antoine Pitrou resolved ARROW-10403.
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Fix Version/s: 4.0.0
Resolution: Fixed
Issue resolved by pull request 9683
[https://github.com/apache/arrow/pull/9683]
> [C++] Implement unique kernel for dictionary type
> -------------------------------------------------
>
> Key: ARROW-10403
> URL: https://issues.apache.org/jira/browse/ARROW-10403
> Project: Apache Arrow
> Issue Type: Bug
> Components: C++
> Reporter: Neal Richardson
> Assignee: Rok Mihevc
> Priority: Major
> Labels: pull-request-available
> Fix For: 4.0.0
>
> Time Spent: 2h 20m
> Remaining Estimate: 0h
>
> Calling the "unique" compute function on a ChunkedArray of dictionary type
> (as read by the CSV reader) errors with "Only hashing for data with equal
> dictionaries currently supported". But is it necessary to hash to get unique
> values from a dictionary type? The dictionary values are the unique values
> (for each chunk), they're already there.
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