[jira] [Commented] (ARROW-12709) [C++] Add variadic string join kernel

["Antoine Pitrou (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/ARROW-12709?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17360678#comment-17360678 ] 

Antoine Pitrou commented on ARROW-12709:
----------------------------------------

Do we want this kernel to be truly variadic or to take a struct array?

> [C++] Add variadic string join kernel
> -------------------------------------
>
>                 Key: ARROW-12709
>                 URL: https://issues.apache.org/jira/browse/ARROW-12709
>             Project: Apache Arrow
>          Issue Type: New Feature
>          Components: C++
>            Reporter: Ian Cook
>            Priority: Major
>
> Similar to SQL's {{concat}} and {{concat_ws}}. Should take 0, 1, 2, ... string arrays and an optional separator (default empty string) and concatenate them together, returning a string array.
> For example, in the case of 2 input arrays and with the separator {{"-"}}, this would take inputs:
> {code}
> Array<string>        Array<string>
> [                    [
>   "foo",               "bar",
>   "push"               "pop"
> ]                    ]
> {code}
> and return output:
> {code}
> Array<string>
> [ 
>   "foo-bar",
>   "push-pop"
> ] 
> {code}
> Should also accept scalar strings and recycle their values.



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