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https://issues.apache.org/jira/browse/ARROW-4096?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17661119#comment-17661119
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Rok Mihevc commented on ARROW-4096:
-----------------------------------
This issue has been migrated to [issue
#20689|https://github.com/apache/arrow/issues/20689] on GitHub. Please see the
[migration documentation|https://github.com/apache/arrow/issues/14542] for
further details.
> [C++] Preserve "ordered" metadata in some special cases in dictionary
> unification
> ---------------------------------------------------------------------------------
>
> Key: ARROW-4096
> URL: https://issues.apache.org/jira/browse/ARROW-4096
> Project: Apache Arrow
> Issue Type: Improvement
> Components: C++
> Reporter: Wes McKinney
> Priority: Major
> Labels: good-second-issue
>
> In the event that all dictionaries are prefixes of a common dictionary, and
> all have ordered=true (note: this is not the same thing as being sorted), the
> resulting unified dictionary can also have ordered=true
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