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https://issues.apache.org/jira/browse/ARROW-14052?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17418036#comment-17418036
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Antoine Pitrou commented on ARROW-14052:
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At least "approx" would be less cryptic.
> [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
> Priority: Major
> Labels: kernel
>
> 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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