[jira] [Updated] (ARROW-13799) [R] case_when error handling is capturing strings

["Neal Richardson (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/ARROW-13799?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Neal Richardson updated ARROW-13799:
------------------------------------
    Labels: good-second-issue  (was: )

> [R] case_when error handling is capturing strings
> -------------------------------------------------
>
>                 Key: ARROW-13799
>                 URL: https://issues.apache.org/jira/browse/ARROW-13799
>             Project: Apache Arrow
>          Issue Type: Bug
>          Components: R
>            Reporter: Neal Richardson
>            Priority: Critical
>              Labels: good-second-issue
>             Fix For: 6.0.0
>
>
> This test, now unskipped since case_when supports string data, fails:
> {code}
>   expect_dplyr_equal(
>     input %>%
>       mutate(
>         cw = case_when(!(!(!(lgl))) ~ factor(chr), TRUE ~ fct)
>       ) %>%
>       collect(),
>     tbl
>   )
> {code}
> On inspection, it seems that `factor(chr)` is hitting `base::factor()`, which tries to call `unique()` on the Expression and that fails with "unique() applies only to vectors". This is getting propagated through to the resulting dataset column because `arrow_eval()` returns a `try-error` on error and `nse_funcs$case_when()` isn't checking for errors.
> cc [~icook]



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