[jira] [Created] (ARROW-14284) [C++][Python] Improve error message when trying use SyncScanner when requiring async

["Joris Van den Bossche (Jira)" <ji...@apache.org>]

Joris Van den Bossche created ARROW-14284:
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             Summary: [C++][Python] Improve error message when trying use SyncScanner when requiring async
                 Key: ARROW-14284
                 URL: https://issues.apache.org/jira/browse/ARROW-14284
             Project: Apache Arrow
          Issue Type: Improvement
          Components: C++
            Reporter: Joris Van den Bossche


See ARROW-14257

The current error message gives "Asynchronous scanning is not supported by SyncScanner"

Copying the comment of [~westonpace]:

In Python it is always use_async=True. In R the scanner is hidden from the user on dataset writes but the option there is use_async as well. In C++ the option is UseAsync in the ScannerBuilder. How about,

"Writing datasets requires that the input scanner is configured to scan asynchronously via the use_async or UseAsync options."




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