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GH-48084: [C++][FlightRPC] Replace boost::optional with std::optional…

conbench-apache-arrow / Conbench performance report failed Dec 18, 2025 in 0s

Found 1 regression

After merging your PR, Conbench analyzed the 3 benchmarking runs that have been run so far on merge-commit 90261d6.

Benchmarks with performance regressions

There was 1 possible performance regression, according to the lookback z-score method.

Benchmarks with regressions:

All benchmark runs analyzed:

Details

This report was generated using the lookback z-score method with a z-score threshold of 30.0.