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Posted to dev@arrow.apache.org by "Micah Kornfield (Jira)" <ji...@apache.org> on 2020/04/18 03:33:01 UTC

[jira] [Created] (ARROW-8504) [C++] Add a method that takes an RLE visitor for a bitmap.

Micah Kornfield created ARROW-8504:
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             Summary: [C++] Add a method that takes an RLE visitor for a bitmap.
                 Key: ARROW-8504
                 URL: https://issues.apache.org/jira/browse/ARROW-8504
             Project: Apache Arrow
          Issue Type: New Feature
          Components: C++
            Reporter: Micah Kornfield


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 visit words.

 

 

 



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