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Posted to jira@arrow.apache.org by "Yibo Cai (Jira)" <ji...@apache.org> on 2020/12/07 05:04:00 UTC

[jira] [Created] (ARROW-10831) [C++][Compute] Implemement quantile kernel

Yibo Cai created ARROW-10831:
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             Summary: [C++][Compute] Implemement quantile kernel
                 Key: ARROW-10831
                 URL: https://issues.apache.org/jira/browse/ARROW-10831
             Project: Apache Arrow
          Issue Type: New Feature
          Components: C++
            Reporter: Yibo Cai
            Assignee: Yibo Cai


Similar function as [https://numpy.org/doc/stable/reference/generated/numpy.quantile.html]
Support chunked array, and calculate multiple quantiles at once.

Possibly implement features in steps:
 - implement exact quantile kernel which records all chunks and partition at finalize
 - reduce memory footprint for integer inputs by maintaining "value:count" histogram
 - implement approximate quantile kernel without storing input values



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