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Posted to jira@arrow.apache.org by "ASF GitHub Bot (Jira)" <ji...@apache.org> on 2021/09/21 16:58:00 UTC

[jira] [Updated] (ARROW-14052) [C++] Add appx_median, hash_appx_median functions

     [ https://issues.apache.org/jira/browse/ARROW-14052?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

ASF GitHub Bot updated ARROW-14052:
-----------------------------------
    Labels: kernel pull-request-available  (was: kernel)

> [C++] Add appx_median, hash_appx_median functions
> -------------------------------------------------
>
>                 Key: ARROW-14052
>                 URL: https://issues.apache.org/jira/browse/ARROW-14052
>             Project: Apache Arrow
>          Issue Type: Improvement
>          Components: C++
>            Reporter: Ian Cook
>            Assignee: David Li
>            Priority: Major
>              Labels: kernel, pull-request-available
>          Time Spent: 10m
>  Remaining Estimate: 0h
>
> The Arrow C++ library has {{tdigest}} and {{hash_tdigest}} kernels that return arrays/lists. We call these from bindings with {{q = 0.5}} to find the approximate median, but the output is difficult to work with. It would be nice to create kernels wrapping these that would produce scalar output per array/group:
> {{appx_median}} --> {{tdigest(q = 0.5)}}
> {{hash_appx_median}} --> {{hash_tdigest(q = 0.5)}}



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