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perf(sql): keep the last two parsed vectors for similarity functions - #52
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The query vector is the same for every row, so it is parsed once per query instead of once per row.
The comma-separated parser used f64::parse, which accepts spellings such as `+1`, `02`, `.5` and `1.` that JSON rejects, so malformed embeddings produced similarity scores instead of NULL.
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The query vector is the same for every row, so it is parsed once per query instead of once per row.