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https://issues.apache.org/jira/browse/ARROW-14904?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17452297#comment-17452297
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Dragoș Moldovan-Grünfeld commented on ARROW-14904:
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[~apitrou] I don't think we do. There is functionality we're not emulating - 
for example, the {{num_threads}} argument in {{readr::write_csv()}} - mostly 
because multithreading is implemented differently in {{{}arrow{}}}. On the 
real-world use - I've definitely used the {{readr::write_csv(..., append = 
TRUE)}} functionality in the past. 

Any thoughts [~npr], [~ianmcook] [~jonkeane]?

> [C++] Enable CSV Writer to append / overwrite existing file
> -----------------------------------------------------------
>
>                 Key: ARROW-14904
>                 URL: https://issues.apache.org/jira/browse/ARROW-14904
>             Project: Apache Arrow
>          Issue Type: Sub-task
>          Components: C++
>            Reporter: Dragoș Moldovan-Grünfeld
>            Priority: Major
>
> This would be a match for the {{readr::write_csv()}} {{append}} argument: 
> boolean. If {{FALSE}} will overwrite existing file. If {{TRUE}} will append 
> to existing file. In both cases, if the file doesn't exist, a new file is 
> created. 



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