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Posted to jira@arrow.apache.org by "Ian Cook (Jira)" <ji...@apache.org> on 2021/09/08 14:06:00 UTC

[jira] [Commented] (ARROW-13772) [R] Binding for median aggregation

    [ https://issues.apache.org/jira/browse/ARROW-13772?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17411961#comment-17411961 ] 

Ian Cook commented on ARROW-13772:
----------------------------------

I believe that either ARROW-12669 (extract item from fixed sized list) or ARROW-13877 (flatten fixed sized list) would unblock this.

> [R] Binding for median aggregation
> ----------------------------------
>
>                 Key: ARROW-13772
>                 URL: https://issues.apache.org/jira/browse/ARROW-13772
>             Project: Apache Arrow
>          Issue Type: Improvement
>          Components: R
>            Reporter: Nic Crane
>            Assignee: Nic Crane
>            Priority: Major
>              Labels: pull-request-available
>          Time Spent: 20m
>  Remaining Estimate: 0h
>
> Another aggregate function we’ll need to look at is median().
> That should in theory map to the existing quantile kernel and the hopefully-coming-soon hash_quantile kernel with  q = 0.5, but that will not work right now for several reasons (see https://issues.apache.org/jira/browse/ARROW-13309).
> However we also have a pair of
>  approximate quantile kernels: tdigest and hash_tdigest that we could map median() to.



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