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GH-46207: [C++] Rename arrow::util::StringBuilder and move to interna…

conbench-apache-arrow / Conbench performance report failed Jul 1, 2025

Found 1 regression

After merging your PR, Conbench analyzed the 3 benchmarking runs that have been run so far on merge-commit 1202d79.

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.