[jira] [Assigned] (ARROW-5005) [C++] Implement support for using selection vectors in scalar aggregate function kernels

["Todd Farmer (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/ARROW-5005?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Todd Farmer reassigned ARROW-5005:
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    Assignee:     (was: Niranda Perera)

This issue was last updated over 90 days ago, which may be an indication it is no longer being actively worked. To better reflect the current state, the issue is being unassigned. Please feel free to re-take assignment of the issue if it is being actively worked, or if you plan to start that work soon.

> [C++] Implement support for using selection vectors in scalar aggregate function kernels
> ----------------------------------------------------------------------------------------
>
>                 Key: ARROW-5005
>                 URL: https://issues.apache.org/jira/browse/ARROW-5005
>             Project: Apache Arrow
>          Issue Type: Improvement
>          Components: C++
>            Reporter: Francois Saint-Jacques
>            Priority: Major
>
> The aggregate kernels don't support mask (the result of a filter). Add the the following method to `AggregateFunction`.
> {code:c++}
> virtual Status ConsumeWithFilter(const Array& input, const Array& mask, void* state) const = 0;
> {code}
> The goal is to add support for AST similar to:
> {code:sql}
> SELECT AGG(x) FROM table WHERE pred;
> {code}



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