Audit tests for duplication and coverage

[robert3005]

Some of the tests covered duplicate logic, they haven't been updated to latest helper functions or simply didn't check the correct thing. This should have audited all of the tests we have in the repo and fix them without losing coverage

[codspeed]

Merging this PR will degrade performance by 13.94%

⚠️ 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.

⚠️ 2 benchmarks measured no execution time

Nothing ran under measurement, usually because the compiler removed the code under test. These results are not comparable, so they count as unchanged.

Preventing compiler optimizations

• density_sweep_dense_runs[0.9]
• bench_compare_sliced_dict_primitive[(3333, 10000)]

⚠️ 9 benchmarks spent significant time in system calls

System calls cannot be consistently instrumented, so they are not included in the measure, which understates the real cost. Please switch to the Walltime instrument to accurately measure system calls.

Measurement and system calls

• random_i128[0.01]
• decompress[u16, (4000, 256)]
• compress_fsst[(200, 4, 4)]
• take_varbin
• multipolygon_mixed_validity
• filter_run_end[len=4096_run=16_density=0.1]
• from_vec_drop_vortex[65536]
• density_sweep_dense_runs[0.9]
• bench_compare_sliced_dict_primitive[(3333, 10000)]

⚠️ Different runtime environments detected

Some benchmarks with significant performance changes were compared across different runtime environments,
which may affect the accuracy of the results.

Open the report in CodSpeed to investigate

⚡ 1 improved benchmark
❌ 4 regressed benchmarks
✅ 2208 untouched benchmarks

Warning

Please fix the performance issues or acknowledge them on CodSpeed.

Performance Changes

	Mode	Benchmark	BASE	HEAD	Efficiency
❌	Simulation	density_sweep_dense_runs[0.001]	29.6 µs	47 µs	-37.06%
❌	WallTime	bitpack_blocked_compress_avx512	4.8 µs	5.6 µs	-14.06%
❌	WallTime	starts_with_avx2[8, VarBin]	41.2 µs	46.6 µs	-11.68%
❌	WallTime	bitpack_blocked_compress_avx2	6.7 µs	7.6 µs	-11.25%
⚡	WallTime	words_gather_dispatch_neon[65536]	2.3 µs	2 µs	+11.34%

Tip

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

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_{Comparing rk/removeredundanttests (97041d3) with develop (58d0490)}