Carlos O'Ryan created ARROW-15119:
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             Summary: [C++] Some filesystems may allow reading directories
                 Key: ARROW-15119
                 URL: https://issues.apache.org/jira/browse/ARROW-15119
             Project: Apache Arrow
          Issue Type: Improvement
            Reporter: Carlos O'Ryan


The generic filesystem tests assert that reading a directory should fail.  If 
directories are implemented as described in ARROW-15114 this would be expensive 
to implement (at least in the near future), as it would require two roundtrips 
to the service to fetch the object metadata.

I would rather change the generic tests to allow reading directories, and if we 
find a cheaper way to fix this later we can restore the tests.



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