[jira] [Resolved] (ARROW-8504) [C++] Add Run Length Reader

["Wes McKinney (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/ARROW-8504?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Wes McKinney resolved ARROW-8504.
---------------------------------
    Fix Version/s: 1.0.0
       Resolution: Fixed

Issue resolved by pull request 7143
[https://github.com/apache/arrow/pull/7143]

> [C++] Add Run Length Reader
> ---------------------------
>
>                 Key: ARROW-8504
>                 URL: https://issues.apache.org/jira/browse/ARROW-8504
>             Project: Apache Arrow
>          Issue Type: New Feature
>          Components: C++
>            Reporter: Micah Kornfield
>            Assignee: Micah Kornfield
>            Priority: Major
>              Labels: pull-request-available
>             Fix For: 1.0.0
>
>          Time Spent: 9h 40m
>  Remaining Estimate: 0h
>
> For nullability data, in many cases nulls are not evenly distributed.  In these cases it would be beneficial to have a mechanism to understand when runs of set/unset bits are encountered.  One example of this is writing translating a bitmap to parquet definition levels .
>  
> An implementation path could be to add this as method on Bitmap that makes an adaptor callback for VisitWords but I think at least for parquet an iterator API might be more appropriate (something that is easily stoppable/resumable).
>  
>  
>  



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