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https://issues.apache.org/jira/browse/ARROW-5279?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16845974#comment-16845974
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Wes McKinney commented on ARROW-5279:
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Don't think I can get to this for 0.14
> [C++] Support reading delta dictionaries in IPC streams
> -------------------------------------------------------
>
> Key: ARROW-5279
> URL: https://issues.apache.org/jira/browse/ARROW-5279
> Project: Apache Arrow
> Issue Type: New Feature
> Components: C++
> Reporter: Wes McKinney
> Priority: Major
> Fix For: 0.15.0
>
>
> This JIRA covers the read path for delta dictionaries. The write path is a
> bit more of a can of worms (since the deltas must be computed)
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