Simplify StatsRewriteCtx rules by leveraging BoundExpressions

[robert3005]

Since we have BoundExpressions we don't have to go through the StatsRewriteCtx
to resolve the dtype anymore

[codspeed]

Merging this PR will degrade performance by 6.75%

⚠️ 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.

⚠️ 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

⚡ 4 improved benchmarks
❌ 6 regressed benchmarks
✅ 2198 untouched benchmarks
⏩ 293 skipped benchmarks¹

Warning

Please fix the performance issues or acknowledge them on CodSpeed.

Performance Changes

	Mode	Benchmark	BASE	HEAD	Efficiency
❌	Simulation	decode_primitives[f32, (1000, 512)]	42 µs	64.6 µs	-34.97%
❌	Simulation	take_fsl_f16_random[16, 100]	119.4 µs	176.8 µs	-32.48%
❌	WallTime	dbp_assemble_kernel_avx512[(I128, 1024)]	467 ns	555 ns	-15.86%
❌	Simulation	take_fsl_u8_random[256, 100]	157.4 µs	182.4 µs	-13.74%
❌	Simulation	take_fsl_nullable_random[16, 100]	165.6 µs	187.6 µs	-11.71%
❌	WallTime	dict_canonicalize_gt_u8_neon[1000000]	489.5 µs	548 µs	-10.68%
⚡	Simulation	take_fsl_u32_random[256, 10]	159.4 µs	124.4 µs	+28.19%
⚡	WallTime	filtered_sink_i64_avx2[OneNullInEight]	26.1 µs	21.9 µs	+19.3%
⚡	WallTime	filtered_sink_i64_avx512[OneNullInEight]	26.5 µs	22.5 µs	+17.46%
⚡	Simulation	take_fsl_random[128, 10]	139.4 µs	126.6 µs	+10.14%

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/boundstatsrewrite (8137cbd) with develop (24d67e8)}

Footnotes

1. 293 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. ↩