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Posted to dev@arrow.apache.org by "Antoine Pitrou (Jira)" <ji...@apache.org> on 2020/02/03 20:51:00 UTC

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

Antoine Pitrou created ARROW-7754:
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             Summary: [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


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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