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Add a canonical decimal width and import decimals at it - #10897

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ct/decimal-width-owner

Import DuckDB decimals at the canonical width

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CodSpeed / CodSpeed Performance Analysis failed Oct 27, 2026 in 0s

Performance Regression: -14.94%

3 warnings

⚠️ Walltime results may be unreliable

Some benchmarks used the Walltime instrument outside CodSpeed Macro Runners, which can make the results inconsistent.

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See affected benchmarks

⚠️ 3 benchmarks are dominated by system calls

System calls cannot be simulated consistently and are left out of the measure. The reported value understates the real cost. Switch to the Walltime instrument to measure them.

Learn more about system calls

See affected benchmarks

⚠️ Base and head ran on different runner types

Some benchmarks with significant performance changes were compared across different runner types, so the changes might not come from the code. Run base and head on the same runner type, or use CodSpeed Macro Runners for more stable results.

Learn more about Macro Runners

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⚡ 5 improved benchmarks
❌ 11 regressed benchmarks
✅ 2192 untouched benchmarks
⏩ 366 skipped benchmarks1
🗄️ 73 archived benchmarks run2

Warning

Please fix the performance issues or acknowledge them on CodSpeed.

Performance Changes

Mode Benchmark BASE HEAD Efficiency
❌ CPU Simulation filter_powerlaw_by_random[10000] 71.7 ns 812.7 ns -91.18%
❌ CPU Simulation test_repeated_scan_scalar_at[int_str] 336.2 µs 412.1 µs -18.41%
❌ CPU Simulation bench_compare_varbin[(50000, 2)] 134.5 µs 164.8 µs -18.38%
❌ CPU Simulation bench_compare_varbin[(50000, 64)] 136.2 µs 166.4 µs -18.14%
❌ CPU Simulation bench_compare_sliced_dict_varbinview[(7500, 10000)] 195.6 µs 230.2 µs -15.02%
❌ CPU Simulation bench_compare_sliced_dict_varbinview[(1000, 10000)] 81.2 µs 92.5 µs -12.22%
❌ CPU Simulation bench_compare_sliced_dict_varbinview[(10000, 10000)] 207.9 µs 236.3 µs -12.02%
❌ Walltime add_constant_shapes_neon[(32768, PerRowConstant)] 14.4 µs 16.1 µs -10.92%
❌ Walltime add_constant_shapes_neon[(32768, PerRowNullableConstant)] 14.9 µs 16.7 µs -10.65%
❌ Walltime add_constant_shapes_neon[(32768, ConstantPerRow)] 14.4 µs 16.1 µs -10.48%
❌ Walltime starts_with_avx512[8, VarBinView] 68.4 µs 76.3 µs -10.34%
⚡ Walltime mul_u64_nonnull_neon 39.1 µs 20.9 µs +87.38%
⚡ CPU Simulation missing_stats[16] 88.2 µs 71.6 µs +23.12%
⚡ CPU Simulation encode_primitives[u8, (2000, 4)] 164.3 µs 135.6 µs +21.19%
⚡ Walltime starts_with_avx512[8, VarBin] 46.1 µs 39.4 µs +17.08%
⚡ Walltime starts_with_avx512[64, VarBin] 60.6 µs 53.2 µs +13.87%

Tip

Investigate this regression by commenting @codspeedbot fix this regression on this PR, or directly use the CodSpeed MCP with your agent.


Comparing ct/decimal-width-owner (9836fef) with develop (487bdba)

Open in CodSpeed

Footnotes

  1. 366 benchmarks were skipped, so the baseline results were used instead. If they were deleted from the codebase, click here and archive them to remove them from the performance reports. ↩

  2. 73 benchmarks were run, but are now archived. If they were deleted in another branch, consider rebasing to remove them from the report. Instead if they were added back, click here to restore them. ↩