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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