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https://issues.apache.org/jira/browse/ARROW-4096?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16931652#comment-16931652
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Antoine Pitrou commented on ARROW-4096:
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Perhaps we should also error out if not all dictionaries have the same
"ordered"?
> [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
> Fix For: 1.0.0
>
>
> 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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