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https://issues.apache.org/jira/browse/ARROW-7754?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17030522#comment-17030522
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Antoine Pitrou commented on ARROW-7754:
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The context was ARROW-5981.
> [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
>
> 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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