duckdb-bench --baseline option

[myrrc]

This isn't a replacement for scripts/compare-benchmark-jsons.py but a way to
quickly compare benchmark query results with baseline.

Add a --baseline parameter for duckdb-bench to use previously exported
--gh-json-v3 file as a baseline

[AdamGS]

this functionality exists in the python tool (vx-bench), I would really love to avoid adding more features to the underlying binaries.

[codspeed-hq]

Merging this PR will improve performance by 19.71%

⚠️ Unknown Walltime execution environment detected

Using the Walltime instrument on standard Hosted Runners will lead to inconsistent data.

For the most accurate results, we recommend using CodSpeed Macro Runners: bare-metal machines fine-tuned for performance measurement consistency.

⚡ 1 improved benchmark
✅ 1236 untouched benchmarks

Performance Changes

	Mode	Benchmark	BASE	HEAD	Efficiency
⚡	Simulation	chunked_varbinview_opt_canonical_into[(1000, 10)]	224.6 µs	187.6 µs	+19.71%

Tip

Curious why this is faster? Comment @codspeedbot explain why this is faster on this PR, or directly use the CodSpeed MCP with your agent.

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_{Comparing myrrc/duckdb-bench-baseline (c99b46b) with develop (f97805d)}

[0ax1]

--gh-json-v3 file as a baseline An interesting addition would be to be able to pass a URL from a PR which the Python runner compares against.