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Posted to jira@arrow.apache.org by "ASF GitHub Bot (Jira)" <ji...@apache.org> on 2020/11/14 16:44:00 UTC

[jira] [Updated] (ARROW-10079) [Rust]: Benchmark and improve count_set_bits function

     [ https://issues.apache.org/jira/browse/ARROW-10079?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

ASF GitHub Bot updated ARROW-10079:
-----------------------------------
    Labels: pull-request-available  (was: )

> [Rust]: Benchmark and improve count_set_bits function
> -----------------------------------------------------
>
>                 Key: ARROW-10079
>                 URL: https://issues.apache.org/jira/browse/ARROW-10079
>             Project: Apache Arrow
>          Issue Type: Improvement
>          Components: Rust
>    Affects Versions: 1.0.1
>            Reporter: Jörn Horstmann
>            Priority: Minor
>              Labels: pull-request-available
>          Time Spent: 10m
>  Remaining Estimate: 0h
>
> `count_set_bits` and `count_set_bits_offset` currently use a lookup table for each byte. I'm thinking it should be more efficient to iterate the data in larger chunks and use the builtin `count_ones` function.



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