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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