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https://issues.apache.org/jira/browse/ARROW-15554?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17488293#comment-17488293
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Antoine Pitrou commented on ARROW-15554:
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Hi [~sgilmore] , thank you for the explanation. In any case, format additions 
have to be discussed and voted on on the development mailing-list. I encourage 
you to create a new discussion there: see [https://arrow.apache.org/community/]

> [Format][C++] Add "LargeMap" type with 64-bit offsets
> -----------------------------------------------------
>
>                 Key: ARROW-15554
>                 URL: https://issues.apache.org/jira/browse/ARROW-15554
>             Project: Apache Arrow
>          Issue Type: Improvement
>          Components: C++, Format
>            Reporter: Sarah Gilmore
>            Priority: Major
>
> It would be nice if a "LargeMap" type existed along side the "Map" type for 
> parity. For other datatypes that require offset arrays/buffers, such as 
> String, List, BinaryArray, provides a "large" version of these types, i.e. 
> LargeString, LargeList, and LargeBinaryArray. It would be nice to have a 
> "LargeMap" for parity.



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