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https://issues.apache.org/jira/browse/ARROW-12392?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17322469#comment-17322469
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Weston Pace commented on ARROW-12392:
-------------------------------------
Ok, from the RunInSerialExecutor benchmark it would seem there would not be
noticeable overhead. I then did some testing on Taxi dataset and got 12.068s
(RunInSerialExecutor) vs 12.046s (without RunInSerialExecutor) (averaged across
10 iterations) which is within the noise so I ended up not bothering with a
mirror API.
> [C++] Restore asynchronous streaming scanner
> --------------------------------------------
>
> Key: ARROW-12392
> URL: https://issues.apache.org/jira/browse/ARROW-12392
> Project: Apache Arrow
> Issue Type: Improvement
> Components: C++
> Reporter: Weston Pace
> Assignee: 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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