Ravil Bikbulatov created ARROW-8532:
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             Summary: [C++][CSV] Add support for sentinel values.
                 Key: ARROW-8532
                 URL: https://issues.apache.org/jira/browse/ARROW-8532
             Project: Apache Arrow
          Issue Type: Improvement
          Components: C++
            Reporter: Ravil Bikbulatov


Some systems still use sentinel values to store nulls. It would be good if 
read_csv would place sentinel values and user wouldn't need to convet null 
bitmaps to sentinel values.

Adding this support doesn't contradict Arrow specification as null values are 
undefined. Also it wouldn't add any overhead to read_csv. Since Arrow is 
general purpose framework I think we can relieve users from pain of converting 
bitmats to sentinel values.



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