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Merge #5369

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5369: exhaustive facet search r=ManyTheFish a=ManyTheFish

Fixes #5403

This PR adds an `exhaustiveFacetCount` field to the `/facet-search` API allowing the end-user to have a better facet count when having a distinct attribute set in the index settings.

 # Usage

`POST /index/:index_uid/facet-search`
**Body:**
```json
{
  "facetQuery": "blob",
  "facetName": "genres",
  "q": "",
  "exhaustiveFacetCount": true
}
```

# Prototype Docker images

```sh
$ docker pull getmeili/meilisearch:prototype-exhaustive-facet-search-00
```

Co-authored-by: ManyTheFish <many@meilisearch.com>
This commit is contained in:
meili-bors[bot] 2025-03-13 10:36:04 +00:00 • committed by GitHub
commit a12b06d99d
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3 changed files with 351 additions and 2 deletions
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19
crates/meilisearch/src/routes/indexes/facet_search.rs
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@ -68,6 +68,8 @@ pub struct FacetSearchQuery {
pub ranking_score_threshold: Option<RankingScoreThreshold>,
#[deserr(default, error = DeserrJsonError<InvalidSearchLocales>, default)]
pub locales: Option<Vec<Locale>>,
#[deserr(default, error = DeserrJsonError<InvalidFacetSearchExhaustiveFacetCount>, default)]
pub exhaustive_facet_count: Option<bool>,
}
#[derive(Default)]
@ -98,6 +100,7 @@ impl FacetSearchAggregator {
hybrid,
ranking_score_threshold,
locales,
exhaustive_facet_count,
} = query;
Self {
@ -110,7 +113,8 @@ impl FacetSearchAggregator {
|| attributes_to_search_on.is_some()
|| hybrid.is_some()
|| ranking_score_threshold.is_some()
|| locales.is_some(),
|| locales.is_some()
|| exhaustive_facet_count.is_some(),
..Default::default()
}
}
@ -293,13 +297,24 @@ impl From<FacetSearchQuery> for SearchQuery {
hybrid,
ranking_score_threshold,
locales,
exhaustive_facet_count,
} = value;
// If exhaustive_facet_count is true, we need to set the page to 0
// because the facet search is not exhaustive by default.
let page = if exhaustive_facet_count.map_or(false, |exhaustive| exhaustive) {
// setting the page to 0 will force the search to be exhaustive when computing the number of hits,
// but it will skip the bucket sort saving time.
Some(0)
} else {
None
};
SearchQuery {
q,
offset: DEFAULT_SEARCH_OFFSET(),
limit: DEFAULT_SEARCH_LIMIT(),
page: None,
page,
hits_per_page: None,
attributes_to_retrieve: None,
retrieve_vectors: false,