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https://issues.apache.org/jira/browse/ARROW-1573?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Wes McKinney resolved ARROW-1573.
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Resolution: Fixed
Assignee: Wes McKinney
This was done in ARROW-1559. The API is in
https://github.com/apache/arrow/blob/master/cpp/src/arrow/compute/kernels/hash.h#L38
> [C++] Implement stateful kernel function that uses DictionaryBuilder to
> compute dictionary indices
> --------------------------------------------------------------------------------------------------
>
> Key: ARROW-1573
> URL: https://issues.apache.org/jira/browse/ARROW-1573
> Project: Apache Arrow
> Issue Type: New Feature
> Components: C++
> Reporter: Wes McKinney
> Assignee: Wes McKinney
> Labels: Analytics
>
> An operator utilizing this kernel may need some way to indicate to
> multithreaded schedulers that it cannot be parallelized on chunked arrays
> (unless we implement a concurrent hash table)
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