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Posted to issues@arrow.apache.org by "Antoine Pitrou (Jira)" <ji...@apache.org> on 2019/09/17 16:53:00 UTC

[jira] [Commented] (ARROW-4096) [C++] Preserve "ordered" metadata in some special cases in dictionary unification

    [ https://issues.apache.org/jira/browse/ARROW-4096?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16931652#comment-16931652 ] 

Antoine Pitrou commented on ARROW-4096:
---------------------------------------

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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