Weston Pace created ARROW-12803:
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             Summary: [C++] [Dataset] Write dataset with scanner does not 
support async scan
                 Key: ARROW-12803
                 URL: https://issues.apache.org/jira/browse/ARROW-12803
             Project: Apache Arrow
          Issue Type: Improvement
          Components: C++
            Reporter: Weston Pace


The file system write uses the legacy Scan method which is not supported by the 
async scanner.  This should be addressed.  It would be useful, for example, 
when copying a dataset from S3 to local disk.



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