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https://issues.apache.org/jira/browse/ARROW-6856?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17040057#comment-17040057
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Antoine Pitrou commented on ARROW-6856:
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Should we do this before 1.0?
> [C++] Use ArrayData instead of Array for ArrayData::dictionary
> --------------------------------------------------------------
>
> Key: ARROW-6856
> URL: https://issues.apache.org/jira/browse/ARROW-6856
> Project: Apache Arrow
> Issue Type: Improvement
> Components: C++
> Reporter: Wes McKinney
> Priority: Major
>
> This would be helpful for consistency. {{DictionaryArray}} may want to cache
> a "boxed" version of this to return from {{DictionaryArray::dictionary}}
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