[jira] [Assigned] (ARROW-17366) [R] Support purrr-style lambda functions in .fns argument to across()

["Nicola Crane (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/ARROW-17366?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Nicola Crane reassigned ARROW-17366:
------------------------------------

    Assignee: Nicola Crane

> [R] Support purrr-style lambda functions in .fns argument to across()
> ---------------------------------------------------------------------
>
>                 Key: ARROW-17366
>                 URL: https://issues.apache.org/jira/browse/ARROW-17366
>             Project: Apache Arrow
>          Issue Type: Sub-task
>          Components: R
>            Reporter: Nicola Crane
>            Assignee: Nicola Crane
>            Priority: Major
>              Labels: pull-request-available
>          Time Spent: 40m
>  Remaining Estimate: 0h
>
> ARROW-11699 adds support for dplyr::across inside a mutate(). The .fns argument does not yet support purrr-style lambda functions (e.g. {{~round(.x, digits = -1)}} but should be added. 
> We could also support anonymous functions, e.g. 
> {code:r}
> mtcars %>% 
>   dplyr::summarise(across(.cols = everything(),function(x){head(x,1)})) 
> {code}
> As well as this, we should check the new ways in which these functions can be specified (n.b. using {{\x}}) as we might want to support both while the older way isn't fully deprecated yet.



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