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https://issues.apache.org/jira/browse/ARROW-1942?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Wes McKinney resolved ARROW-1942.
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Resolution: Fixed
Issue resolved by pull request 1551
[https://github.com/apache/arrow/pull/1551]
> [C++] Hash table specializations for small integers
> ---------------------------------------------------
>
> Key: ARROW-1942
> URL: https://issues.apache.org/jira/browse/ARROW-1942
> Project: Apache Arrow
> Issue Type: Improvement
> Components: C++
> Reporter: Wes McKinney
> Assignee: Panchen Xue
> Priority: Major
> Labels: pull-request-available
> Fix For: 0.9.0
>
>
> There is no need to use a dynamically-sized hash table with uint8, int8,
> since a fixed-size lookup table can be used and avoid hashing altogether
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