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Use an union instead of a sort for prefix fetching

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Clément Renault 2020-01-16 17:09:27 +01:00
parent 70a529d197
commit d7a7560220
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1 changed files with 7 additions and 8 deletions
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11
meilisearch-core/src/query_tree.rs
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@ -397,25 +397,24 @@ pub fn traverse_query_tree<'o, 'txn>(
array
};
let mut docids = Vec::new();
let mut results: Vec<&Set<_>> = Vec::new();
// We retrieve the cached postings lists for all
// the words that starts with this short prefix.
let result = ctx.prefix_postings_lists.prefix_postings_list(reader, prefix)?.unwrap_or_default();
let key = PostingsKey { query, input: word.clone().into_bytes(), distance: 0, is_exact: false };
postings.insert(key, result.matches);
docids.extend_from_slice(&result.docids);
results.push(&result.docids);
// We retrieve the exact postings list for the prefix,
// because we must consider these matches as exact.
if let Some(result) = ctx.postings_lists.postings_list(reader, word.as_bytes())? {
let result = ctx.postings_lists.postings_list(reader, word.as_bytes())?.unwrap_or_default();
let key = PostingsKey { query, input: word.clone().into_bytes(), distance: 0, is_exact: true };
postings.insert(key, result.matches);
docids.extend_from_slice(&result.docids);
}
results.push(&result.docids);
let before = Instant::now();
let docids = SetBuf::from_dirty(docids);
let docids = sdset::multi::Union::new(results).into_set_buf();
println!("{:2$}prefix docids construction took {:.02?}", "", before.elapsed(), depth * 2);
Cow::Owned(docids)