[jira] [Updated] (ARROW-7754) [C++] Result is slow

["ASF GitHub Bot (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/ARROW-7754?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

ASF GitHub Bot updated ARROW-7754:
----------------------------------
    Labels: pull-request-available  (was: )

> [C++] Result<T> is slow
> -----------------------
>
>                 Key: ARROW-7754
>                 URL: https://issues.apache.org/jira/browse/ARROW-7754
>             Project: Apache Arrow
>          Issue Type: Improvement
>          Components: C++
>            Reporter: Antoine Pitrou
>            Assignee: Antoine Pitrou
>            Priority: Major
>              Labels: pull-request-available
>
> When converting a short performance-critical function to return a Result (instead of returning a Status and filling a out-parameter), I noticed a catastrophic performance regression (around 2x or 3x slower).
> It seems the current Result implementation is very slow, for several reasons:
> - it imposes "safety" features even in release mode, for example on the critical path of move operators
> - the underlying mpark variant implementation is not optimized for performance-critical data structures



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