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https://issues.apache.org/jira/browse/ARROW-4374?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Uwe L. Korn resolved ARROW-4374.
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Resolution: Fixed
Issue resolved by pull request 3488
[https://github.com/apache/arrow/pull/3488]
> [C++] DictionaryBuilder does not correctly report length and null_count
> -----------------------------------------------------------------------
>
> Key: ARROW-4374
> URL: https://issues.apache.org/jira/browse/ARROW-4374
> Project: Apache Arrow
> Issue Type: Bug
> Affects Versions: 0.12.0
> Reporter: Uwe L. Korn
> Assignee: Uwe L. Korn
> Priority: Major
> Labels: pull-request-available
> Fix For: 0.13.0
>
> Time Spent: 10m
> Remaining Estimate: 0h
>
> In comparison to most builders, they stay constantly at 0.
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