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https://issues.apache.org/jira/browse/ARROW-1200?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16087578#comment-16087578
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Uwe L. Korn commented on ARROW-1200:
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PR: https://github.com/apache/arrow/pull/838
> [C++] DictionaryBuilder should use signed integers for indices
> --------------------------------------------------------------
>
> Key: ARROW-1200
> URL: https://issues.apache.org/jira/browse/ARROW-1200
> Project: Apache Arrow
> Issue Type: Bug
> Components: C++
> Reporter: Wes McKinney
> Assignee: Uwe L. Korn
> Priority: Blocker
> Fix For: 0.5.0
>
>
> Unsigned integers are out of spec at the moment. I ran into this in
> ARROW-1199 so please check with me before starting a patch for this =)
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