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bench: add Realistic (40% quoted) benchmark case - #86
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Add generateRealisticCSV / generateRealisticRecords generators and
BenchmarkReadAll_Realistic_100K_{Stdlib,SIMD} to cover the case where
prefixXOR / PCLMULQDQ fires on partial data — 4 of 10 fields quoted
with embedded commas, 6 plain. Also add BenchmarkReadAll_Quoted_100K
to provide a 100K-row baseline for the all-quoted worst case.
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Summary
generateRealisticCSV/generateRealisticRecords: 4/10 fields quoted with embedded commas, 6 plain — exercises the prefixXOR / PCLMULQDQ hot path on realistic mixed dataBenchmarkReadAll_Realistic_100K_{Stdlib,SIMD}for the new workloadBenchmarkReadAll_Quoted_100K_{Stdlib,SIMD}for the all-quoted worst case at 100K rowsTest plan
GOEXPERIMENT=simd GOARCH=amd64 go vet ./...passesBenchmarkReadAll_Realistic_100KandBenchmarkReadAll_Quoted_100Kon AVX-512 runner