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

["Weston Pace (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/ARROW-14284?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Weston Pace reassigned ARROW-14284:
-----------------------------------

    Assignee: Weston Pace

> [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
>            Assignee: Weston Pace
>            Priority: Major
>
> 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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