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Hybrid retrieval in one Postgres query: RRF over tsvector + pgvector

This story is from 2026-09-21. It is preserved in the archive; the latest stories are on the live feed.

Dense vector search is great until your agent asks for parseAuthHeader and gets back three chunks about "authentication token handling" — semantically close, functionally useless. Same story with file paths, error codes, and compliance clause numbers. These are lexical needles, and embeddings blur…

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  1. 2026-09-21 12:15 · DEV Community — AI
    Hybrid retrieval in one Postgres query: RRF over tsvector + pgvector

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