Hybrid Search

← Previous Chapter: Part 2: Ingestion & Atomic Catalog Chunking | Series Hub | Next Chapter: Part 4: Active RAG & Strict Tool Calling → Prerequisite: Read Part 2: Data Ingestion & E-commerce Chunking: Bringing Product Catalogs to AI to understand the Atomic Chunking model and vector point schema. Answer-first: Hybrid search in Qdrant fuses dense semantic embeddings with sparse lexical tokens via Reciprocal Rank Fusion, boosting Top-10 catalog retrieval recall from 78.2% to 96.8%. Executing payload index pre-filtering directly within HNSW graph traversals enforces strict brand, category, and price boundaries in sub-2ms, while scalar quantization reduces cluster RAM consumption by 75% without sacrificing product discovery relevance. ...

Answer-first: Enterprise code Retrieval-Augmented Generation transcends naive line-based text chunking by combining Tree-sitter Abstract Syntax Tree parsing, hybrid BM25 and dense vector search, and GraphRAG symbol knowledge graphs, enabling autonomous engineering agents to resolve multi-hop inter-service dependencies, navigate deep interface inheritance hierarchies, and eliminate hallucinated method signatures across massive distributed code repositories. Prerequisite: Understanding of vector databases, lexical search (BM25), code syntax trees, and knowledge graph representations. 1. The Fallacy of “Plug-and-Play” Vector Search When engineering teams attempt to index large repositories using generic RAG tools, developers quickly encounter the “Garbage-In, Garbage-Out” paradox: ...