[jira] [Assigned] (ARROW-15822) [C++] Cast duration to string (thus CSV writing) not supported

["Ben Harkins (Jira)" <ji...@apache.org>]

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

Ben Harkins reassigned ARROW-15822:
-----------------------------------

    Assignee: Ben Harkins

> [C++] Cast duration to string (thus CSV writing) not supported
> --------------------------------------------------------------
>
>                 Key: ARROW-15822
>                 URL: https://issues.apache.org/jira/browse/ARROW-15822
>             Project: Apache Arrow
>          Issue Type: Bug
>          Components: C++, R
>    Affects Versions: 7.0.0, 7.0.2
>            Reporter: Carl Boettiger
>            Assignee: Ben Harkins
>            Priority: Critical
>
> Edit (Dragos Moldovan-Grünfeld): The issue I opened (ARROW-15833) is basically a duplicate of this. It's fundamentally a C++ issue that happened to surface in the R CSV writer. I hope you don't mind, I modified the components to C++
> ===================
> 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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