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Query Fan-out

The number of sub-queries or downstream requests that a system issues in response to a single user query.

What is Query Fan-out?

Query Fan-Out refers to the number of sub-queries or downstream requests that a system issues in response to a single user query.

When a user submits one query (for example, to a search engine or LLM), the system may 'fan it out' into multiple smaller queries sent to various back-end services, indexes, APIs, or databases — and then aggregate all the results before returning an answer.

In large language model-based systems (like ChatGPT, Claude, Perplexity, or Arc Search):

• Query fan-out indicates how many sources or documents are retrieved for one user query.

• In RAG (Retrieval-Augmented Generation) systems, it's often the number of document 'chunks' fetched from a vector database. Example: retrieving the top-20 most relevant passages → fan-out = 20.

• In AI search engines (e.g., Perplexity), fan-out may reach hundreds of simultaneous web queries to gather diverse evidence before synthesis.

How Qwairy Makes This Actionable

Qwairy's Search Intelligence feature reveals the query fan-out patterns of AI platforms. When you monitor a core query, discover which sub-queries and related searches AI systems generate behind the scenes. This intelligence helps you create content targeting not just the main query, but the entire fan-out of related searches AI platforms use to build comprehensive answers.

Frequently Asked Questions

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