Update the exact criterion to use the documents fields counts

meilidb-core/src/criterion/exact.rs

@@ -1,16 +1,38 @@
 use std::cmp::Ordering;
+
+use sdset::Set;
 use slice_group_by::GroupBy;
+use meilidb_schema::SchemaAttr;
+
 use crate::criterion::Criterion;
 use crate::RawDocument;
 
 #[inline]
-fn number_exact_matches(query_index: &[u32], is_exact: &[bool]) -> usize {
+fn number_exact_matches(
+    query_index: &[u32],
+    attribute: &[u16],
+    is_exact: &[bool],
+    fields_counts: &Set<(SchemaAttr, u64)>,
+) -> usize
+{
     let mut count = 0;
     let mut index = 0;
 
     for group in query_index.linear_group() {
         let len = group.len();
-        count += is_exact[index..index + len].contains(&true) as usize;
+
+        let mut found_exact = false;
+        for (pos, _) in is_exact[index..index + len].iter().filter(|x| **x).enumerate() {
+            found_exact = true;
+            if let Ok(pos) = fields_counts.binary_search_by_key(&attribute[pos], |(a, _)| a.0) {
+                let (_, count) = fields_counts[pos];
+                if count == 1 {
+                    return usize::max_value()
+                }
+            }
+        }
+
+        count += found_exact as usize;
         index += len;
     }
 
@@ -25,13 +47,19 @@ impl Criterion for Exact {
         let lhs = {
             let query_index = lhs.query_index();
             let is_exact = lhs.is_exact();
-            number_exact_matches(query_index, is_exact)
+            let attribute = lhs.attribute();
+            let fields_counts = &lhs.fields_counts;
+
+            number_exact_matches(query_index, attribute, is_exact, fields_counts)
         };
 
         let rhs = {
             let query_index = rhs.query_index();
             let is_exact = rhs.is_exact();
-            number_exact_matches(query_index, is_exact)
+            let attribute = rhs.attribute();
+            let fields_counts = &rhs.fields_counts;
+
+            number_exact_matches(query_index, attribute, is_exact, fields_counts)
         };
 
         lhs.cmp(&rhs).reverse()
@@ -52,14 +80,51 @@ mod tests {
     // doc1: "souliereres rouge"
     #[test]
     fn easy_case() {
-        let query_index0 = &[0];
-        let is_exact0 = &[true];
+        let doc0 = {
+            let query_index   = &[0];
+            let attribute     = &[0];
+            let is_exact      = &[true];
+            let fields_counts = Set::new(&[(SchemaAttr(0), 2)]).unwrap();
 
-        let query_index1 = &[0];
-        let is_exact1 = &[false];
+            number_exact_matches(query_index, attribute, is_exact, fields_counts)
+        };
+
+        let doc1 = {
+            let query_index   = &[0];
+            let attribute     = &[0];
+            let is_exact      = &[false];
+            let fields_counts = Set::new(&[(SchemaAttr(0), 2)]).unwrap();
+
+            number_exact_matches(query_index, attribute, is_exact, fields_counts)
+        };
+
+        assert_eq!(doc0.cmp(&doc1).reverse(), Ordering::Less);
+    }
+
+    // typing: "soulier"
+    //
+    // doc0: { 0. "soulier" }
+    // doc1: { 0. "soulier bleu et blanc" }
+    #[test]
+    fn basic() {
+        let doc0 = {
+            let query_index   = &[0];
+            let attribute     = &[0];
+            let is_exact      = &[true];
+            let fields_counts = Set::new(&[(SchemaAttr(0), 1)]).unwrap();
+
+            number_exact_matches(query_index, attribute, is_exact, fields_counts)
+        };
+
+        let doc1 = {
+            let query_index   = &[0];
+            let attribute     = &[0];
+            let is_exact      = &[true];
+            let fields_counts = Set::new(&[(SchemaAttr(0), 4)]).unwrap();
+
+            number_exact_matches(query_index, attribute, is_exact, fields_counts)
+        };
 
-        let doc0 = number_exact_matches(query_index0, is_exact0);
-        let doc1 = number_exact_matches(query_index1, is_exact1);
         assert_eq!(doc0.cmp(&doc1).reverse(), Ordering::Less);
     }
 }