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Posted to jira@arrow.apache.org by "Carl Boettiger (Jira)" <ji...@apache.org> on 2022/03/02 04:20:00 UTC

[jira] [Created] (ARROW-15822) arrow_write_csv cannot write difftime objects

Carl Boettiger created ARROW-15822:
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             Summary: 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


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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