[jira] [Updated] (ARROW-12711) [R] Bindings for paste(collapse), str_c(collapse), and str_flatten()

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

     [ https://issues.apache.org/jira/browse/ARROW-12711?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Neal Richardson updated ARROW-12711:
------------------------------------
    Fix Version/s:     (was: 6.0.0)
                   7.0.0

> [R] Bindings for paste(collapse), str_c(collapse), and str_flatten()
> --------------------------------------------------------------------
>
>                 Key: ARROW-12711
>                 URL: https://issues.apache.org/jira/browse/ARROW-12711
>             Project: Apache Arrow
>          Issue Type: New Feature
>          Components: R
>            Reporter: Ian Cook
>            Priority: Major
>              Labels: query-engine
>             Fix For: 7.0.0
>
>
> These are the aggregating versions of string concatenation—they combine values from a set of rows into a single value. 
> The bindings for {{paste()}} and {{str_c()}} might be tricky to implement because when these functions are called with the {{coallapse}} argument unset, they do _not_ aggregate.
> In {{summarise()}} we need to be able to use scalar concatenation within aggregate concatenation, like this: 
> {code:java}
> starwars %>%
>   filter(!is.na(hair_color) & !is.na(eye_color)) %>% 
>   group_by(homeworld) %>% 
>   summarise(hair_and_eyes = paste0(paste0(hair_color, "-haired and ", eye_color, "-eyed"), collapse = ", ")){code}



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