Wes McKinney created ARROW-340:

             Summary: [C++] Opening a writeable file on disk that already 
exists does not truncate to zero
                 Key: ARROW-340
                 URL: https://issues.apache.org/jira/browse/ARROW-340
             Project: Apache Arrow
          Issue Type: Bug
          Components: C++
            Reporter: Wes McKinney

This can result in corrupted files. On creating a "new" file, it needs to be 
truncated to zero bytes. 

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