Update the criteria to the new ones

meilisearch-core/src/criterion/words.rs

@@ -0,0 +1,43 @@
+use std::cmp::Ordering;
+
+use compact_arena::SmallArena;
+
+use crate::automaton::QueryEnhancer;
+use crate::bucket_sort::{PostingsListView, QueryWordAutomaton};
+use crate::RawDocument;
+
+use super::{Criterion, prepare_query_distances};
+
+pub struct Words;
+
+impl Criterion for Words {
+    fn name(&self) -> &str { "words" }
+
+    fn prepare<'a, 'tag, 'txn>(
+        &self,
+        documents: &mut [RawDocument<'a, 'tag>],
+        postings_lists: &mut SmallArena<'tag, PostingsListView<'txn>>,
+        query_enhancer: &QueryEnhancer,
+        automatons: &[QueryWordAutomaton],
+    ) {
+        prepare_query_distances(documents, query_enhancer, automatons, postings_lists);
+    }
+
+    fn evaluate(
+        &self,
+        lhs: &RawDocument,
+        rhs: &RawDocument,
+        postings_lists: &SmallArena<PostingsListView>,
+    ) -> Ordering
+    {
+        #[inline]
+        fn number_of_query_words(distances: &[Option<u8>]) -> usize {
+            distances.iter().cloned().filter(Option::is_some).count()
+        }
+
+        let lhs = number_of_query_words(&lhs.processed_distances);
+        let rhs = number_of_query_words(&rhs.processed_distances);
+
+        lhs.cmp(&rhs).reverse()
+    }
+}