Nate Clark created ARROW-12996:
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             Summary: [C++] CSV stream reader has no progress indication
                 Key: ARROW-12996
                 URL: https://issues.apache.org/jira/browse/ARROW-12996
             Project: Apache Arrow
          Issue Type: Improvement
          Components: C++
    Affects Versions: 5.0.0
            Reporter: Nate Clark
            Assignee: Nate Clark


The StreamingReader API does not provide a way to detect progress of the 
stream. It would be useful to have a methods to expose number of bytes read as 
well as total number of bytes in the csv file so that progress can be 
calculated.



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