[jira] [Updated] (ARROW-15822) [C++] arrow_write_csv cannot write difftime objects

["Dragoș Moldovan-Grünfeld (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/ARROW-15822?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Dragoș Moldovan-Grünfeld updated ARROW-15822:
---------------------------------------------
    Summary: [C++] arrow_write_csv cannot write difftime objects  (was: [R] arrow_write_csv cannot write difftime objects)

> [C++] arrow_write_csv cannot write difftime objects
> ---------------------------------------------------
>
>                 Key: ARROW-15822
>                 URL: https://issues.apache.org/jira/browse/ARROW-15822
>             Project: Apache Arrow
>          Issue Type: Bug
>          Components: R
>    Affects Versions: 7.0.0, 7.0.1
>            Reporter: Carl Boettiger
>            Priority: Major
>
> Consider this reprex:
> {code:java}
> arrow::write_csv_arrow(data.frame(time = as.difftime(1, units="secs")), "test.csv"){code}
> This errors with: 
> Error: NotImplemented: Unsupported cast from duration[s] to utf8 using function cast_string
>  
> Note that readr::write_csv() has no trouble with this (which renders the data as "1" without a unit).  Arguably the readr rendering is lossy, but then we usually assume units are provided in other metadata anyway.



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