perf(index): use SIMD-dispatched l2_u8 in SQDistCalculator#6692
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SQDistCalculator was calling l2_distance_uint_scalar (pure scalar loop) for L2/Cosine distance computation on quantized u8 vectors. This misses the runtime-dispatched SIMD implementations (AVX2 / AVX-512 VNNI) that were added in lance-format#6517 and wired into the L2 trait. Replace the direct scalar call with l2_u8::l2_u8(), which automatically selects the best available SIMD backend at runtime: - AVX-512 VNNI: 64 elements/iter - AVX2: 32 elements/iter - Scalar fallback for other architectures Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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SQDistCalculator was calling l2_distance_uint_scalar (pure scalar loop) for L2/Cosine distance computation on quantized u8 vectors. This misses the runtime-dispatched SIMD implementations (AVX2 / AVX-512 VNNI) that were added in #6517 and wired into the L2 trait.
Replace the direct scalar call with l2_u8::l2_u8(), which automatically selects the best available SIMD backend at runtime: