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feat(fuzzy): boost shared-prefix candidates in ranking #67

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feat(fuzzy): boost shared-prefix candidates in ranking #67

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11 changes: 10 additions & 1 deletion crates/lash-core/src/fuzzy.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -114,7 +114,16 @@ impl FuzzyMatcher {
let mut scored: Vec<FuzzyCandidate> = candidates
.iter()
.map(|candidate| {
let score = self.compute_similarity(query, candidate);
let mut score = self.compute_similarity(query, candidate);
// Boost candidates that share the query's leading characters:
// typos cluster at the end of IDs, so a shared prefix is a
// stronger signal than the raw edit distance alone.
let prefix_len = query.len().min(3);
if let Some(prefix) = query.get(..prefix_len) {
if !prefix.is_empty() && candidate.starts_with(prefix) {
score = (score + 0.02).min(1.0);
}
}
FuzzyCandidate {
task_id: candidate.clone(),
score,
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