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https://issues.apache.org/jira/browse/ARROW-16008?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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ASF GitHub Bot updated ARROW-16008:
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Labels: pull-request-available (was: )
> [C++] It is more expensive than expected to create a default Result<T>
> ----------------------------------------------------------------------
>
> Key: ARROW-16008
> URL: https://issues.apache.org/jira/browse/ARROW-16008
> Project: Apache Arrow
> Issue Type: Improvement
> Components: C++
> Reporter: Weston Pace
> Assignee: Weston Pace
> Priority: Minor
> Labels: pull-request-available
> Time Spent: 10m
> Remaining Estimate: 0h
>
> I had expected:
> {noformat}
> Result<T> my_result;
> T my_value;
> {noformat}
> to be more or less equivalent statements (as I think of Result<T> as a "T or
> Status variant"). However, a default result initializes itself with an error
> status and the error message must be allocated and copied. As a result, it
> is considerably more expensive (100's of ns compared to 1's of ns).
> I'm not certain how much of an issue this is however. It's possible we don't
> often create default results or their creation is optimized out. I
> prototyped a solution but did not see much change in any benchmarks. So
> perhaps it is not something worth changing but I figured I'd open it up to
> discussion.
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