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https://issues.apache.org/jira/browse/ARROW-12392?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17322286#comment-17322286
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Antoine Pitrou commented on ARROW-12392:
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You can try to use it and measure actual timings? Then we can decide from that 
:-)

> [C++] Restore asynchronous streaming scanner as a mirror API
> ------------------------------------------------------------
>
>                 Key: ARROW-12392
>                 URL: https://issues.apache.org/jira/browse/ARROW-12392
>             Project: Apache Arrow
>          Issue Type: Improvement
>          Components: C++
>            Reporter: Weston Pace
>            Priority: Major
>
> In order to support the AsyncScanner we need the asynchronous streaming CSV 
> reader back (added in ARROW-11887 but reverted later).  However, it will 
> either need to be implemented as a mirror API (so the sync and async 
> implementations are side-by-side) or the async-API must be wrapped with 
> RunInSerialExecutor when called synchronously.



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