Home/ Part XIII — Expert Mode: Systems, Agents, and Automation/41. Advanced RAG (Beyond the Basics)/41.3 Query rewriting and expansion

41.3 Query rewriting and expansion

Overview and links for this section of the guide.

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Lazy Users

Users type "pricing". They mean "What is the pricing for the Enterprise plan?".

Query Rewriting: Ask an LLM to rewrite the query before searching.

Input: "pricing" LLM: "Retrieve documents about the Enterprise, Pro, and Free tier pricing models." Search: (Uses the detailed query).

HyDE (Hypothetical Document Embeddings)

Ask the LLM to hallucinate the answer. "The Enterprise plan costs $50/month..." Embed that hallucination. Search for documents that look like the answer.

This often finds better matches than searching for the question.

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