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Posted to jira@arrow.apache.org by "Ian Cook (Jira)" <ji...@apache.org> on 2021/09/21 04:39:00 UTC

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

Ian Cook created ARROW-14052:
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             Summary: [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


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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