[jira] [Created] (ARROW-12496) [C++][Dataset] Ensure Scanner tests fully cover async

[David Li (Jira)]

David Li created ARROW-12496:
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             Summary: [C++][Dataset] Ensure Scanner tests fully cover async
                 Key: ARROW-12496
                 URL: https://issues.apache.org/jira/browse/ARROW-12496
             Project: Apache Arrow
          Issue Type: Improvement
            Reporter: David Li
            Assignee: David Li


Some of the tests for scanners don't fully cover the async scanner as they scan 
a single fragment, which isn't supported by AsyncScanner.



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