[jira] [Assigned] (ARROW-15269) [C++][Docs] Clarify that not all compute functions are invocable via CallFunction

["Sanjiban Sengupta (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/ARROW-15269?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Sanjiban Sengupta reassigned ARROW-15269:
-----------------------------------------

    Assignee: Sanjiban Sengupta

> [C++][Docs] Clarify that not all compute functions are invocable via CallFunction
> ---------------------------------------------------------------------------------
>
>                 Key: ARROW-15269
>                 URL: https://issues.apache.org/jira/browse/ARROW-15269
>             Project: Apache Arrow
>          Issue Type: Improvement
>          Components: C++, Documentation
>            Reporter: Eduardo Ponce
>            Assignee: Sanjiban Sengupta
>            Priority: Minor
>              Labels: good-first-issue, pull-request-available
>             Fix For: 8.0.0
>
>          Time Spent: 1h 10m
>  Remaining Estimate: 0h
>
> It has been noted by users that the [Compute Functions documentation ("Invoking functions" section) states that functions are invoked via CallFunction|https://arrow.apache.org/docs/cpp/compute.html#invoking-functions], but there exist functions (specifically ["Grouped aggregations"|#grouped-aggregations-group-by]) that can't be invoked directly via {{CallFunction}}. This is a bit misleading, although this is stated in the description of "Grouped aggregations".
> Grouped aggregations are stateful functions and at the moment stateful functions are not invocable in such a way.
> We should clarify in "Invoking functions" section that not all compute functions are directly invocable via {{CallFunction}}.



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