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QueryClassifier

engine::routing

Struct QueryClassifier 

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pub struct QueryClassifier;
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Heuristic classifier that determines the best retrieval strategy for a free-text query without any model inference.

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impl QueryClassifier

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pub fn classify(query: &str) -> QueryKind

Classify a raw query string into a QueryKind.

Heuristics (in priority order):

  1. Natural language question (has ? or starts with a question word) → QueryKind::Hybrid BM25 finds exact names/dates while vector captures semantic intent. This covers all LoCoMo benchmark queries which are long NL questions.
  2. ≥ 8 words or sentence ends in . (prose, no question) → QueryKind::Semantic
  3. ≤ 3 words with no sentence structure → QueryKind::Keyword
  4. Everything else → QueryKind::Hybrid

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