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Query Rewriting and HyDE (ANSWERED)

Scenario BasedRAGMedium15 min read

Medium RAG interview question on query rewriting and hyde — architecture, trade-offs, eval, and production patterns.

TL;DR — Quick Answer

Query rewriting expands acronyms, adds domain terms, or produces standalone questions from conversational context. HyDE generates a hypothetical answer document, embeds that instead of the raw query, and often improves dense retrieval on vague questions at the cost of an extra LLM call.

The Interview Question

Explain query rewriting and hyde. How would you design, implement, and evaluate this in a production RAG system? Discuss trade-offs and failure modes.

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