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Posted to jira@arrow.apache.org by "Antoine Pitrou (Jira)" <ji...@apache.org> on 2021/11/23 18:10:00 UTC

[jira] [Assigned] (ARROW-8761) [C++] Improve the performance of minmax kernel

     [ https://issues.apache.org/jira/browse/ARROW-8761?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Antoine Pitrou reassigned ARROW-8761:
-------------------------------------

    Assignee:     (was: Liya Fan)

> [C++] Improve the performance of minmax kernel
> ----------------------------------------------
>
>                 Key: ARROW-8761
>                 URL: https://issues.apache.org/jira/browse/ARROW-8761
>             Project: Apache Arrow
>          Issue Type: Improvement
>          Components: C++
>            Reporter: Liya Fan
>            Priority: Minor
>              Labels: pull-request-available
>          Time Spent: 1h 20m
>  Remaining Estimate: 0h
>
> We improve the performance of the max-min kernel with the simple idea: if the current value is smaller than the current min value; then there is no need to compare it against the current max value, because it must be smaller than the current max value. 
> This simple trick reduces the expected number of comparisons from 2n to 1.5n, which can be notable for large arrays. 



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