4581: Always show facet numbers in alpha order in the facet distribution r=ManyTheFish a=Kerollmops

This PR fixes #4559 by making sure that the number facets (facets that come from numbers from the documents) are always displayed in alpha order, even when there is a small amount to display.

The issue was due to some algorithms executed when the number of facet values to display was small. We can see that now, facet values are always displayed correctly.

```json
"facetDistribution": {
    "release_year": {
        "2010": 1,
        "2011": 1,
        "2012": 1,
        "2013": 1,
        "2014": 1,
        "2015": 1,
        "2016": 1,
        "2017": 1,
        "2018": 1,
        "2019": 19,
        "2020": 1,
        "2021": 1,
        "2022": 1,
        "2023": 1,
        "2024": 1,
        "2025": 1
    }
}
```

Co-authored-by: Clément Renault <clement@meilisearch.com>
This commit is contained in:
meili-bors[bot] 2024-04-17 15:18:58 +00:00 committed by GitHub
commit 442de982a9
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@ -97,6 +97,7 @@ impl<'a> FacetDistribution<'a> {
) -> heed::Result<()> {
match facet_type {
FacetType::Number => {
let mut lexicographic_distribution = BTreeMap::new();
let mut key_buffer: Vec<_> = field_id.to_be_bytes().to_vec();
let distribution_prelength = distribution.len();
@ -111,14 +112,17 @@ impl<'a> FacetDistribution<'a> {
for result in iter {
let ((_, _, value), ()) = result?;
*distribution.entry(value.to_string()).or_insert(0) += 1;
*lexicographic_distribution.entry(value.to_string()).or_insert(0) += 1;
if distribution.len() - distribution_prelength == self.max_values_per_facet
if lexicographic_distribution.len() - distribution_prelength
== self.max_values_per_facet
{
break;
}
}
}
distribution.extend(lexicographic_distribution);
}
FacetType::String => {
let mut normalized_distribution = BTreeMap::new();