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For a large corpus, should you use document-side query...
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See plansThe choice depends on the break-even point between indexing costs and per-query inference costs. For a corpus of 10 million documents and 2 million queries per day, the cumulative query volume will quickly surpass the one-time indexing cost, making per-query LLM rewriting expensive. However, query-time rewriting is superior for adapting to live queries that the document author never anticipated. A robust system design often employs both: document-side expansion for baseline coverage and query-time rewriting for specific, complex user intent.