Merge Phrase and WordDerivations into one structure

milli/src/search/new/logger/detailed.rs

@@ -6,7 +6,7 @@ use std::time::Instant;
 use rand::random;
 use roaring::RoaringBitmap;
 
-use crate::search::new::query_term::{LocatedQueryTerm, QueryTerm, WordDerivations};
+use crate::search::new::query_term::{LocatedQueryTerm, QueryTerm};
 use crate::search::new::ranking_rule_graph::{
     Edge, EdgeCondition, EmptyPathsCache, ProximityGraph, RankingRuleGraph, RankingRuleGraphTrait,
     TypoGraph,
@@ -432,14 +432,8 @@ results.{random} {{
         file: &mut File,
     ) {
         match &node {
-            QueryNode::Term(LocatedQueryTerm { value, .. }) => match value {
+            QueryNode::Term(LocatedQueryTerm { value, .. }) => {
-                QueryTerm::Phrase { phrase } => {
+                let QueryTerm {
-                    let phrase = ctx.phrase_interner.get(*phrase);
-                    let phrase_str = phrase.description(&ctx.word_interner);
-                    writeln!(file, "{node_idx} : \"{phrase_str}\"").unwrap();
-                }
-                QueryTerm::Word { derivations } => {
-                    let WordDerivations {
                     original,
                     zero_typo,
                     one_typo,
@@ -449,7 +443,9 @@ results.{random} {{
                     split_words,
                     prefix_of,
                     is_prefix: _,
-                    } = ctx.derivations_interner.get(*derivations);
+                    is_ngram: _,
+                    phrase,
+                } = ctx.term_interner.get(*value);
 
                 let original = ctx.word_interner.get(*original);
                 writeln!(
@@ -474,6 +470,11 @@ shape: class"
                     let w = ctx.word_interner.get(w);
                     writeln!(file, "\"{w}\" : 2").unwrap();
                 }
+                if let Some(phrase) = phrase {
+                    let phrase = ctx.phrase_interner.get(*phrase);
+                    let phrase_str = phrase.description(&ctx.word_interner);
+                    writeln!(file, "\"{phrase_str}\" : phrase").unwrap();
+                }
                 if let Some(split_words) = split_words {
                     let phrase = ctx.phrase_interner.get(*split_words);
                     let phrase_str = phrase.description(&ctx.word_interner);
@@ -495,7 +496,6 @@ shape: class"
 
                 writeln!(file, "}}").unwrap();
             }
-            },
             QueryNode::Deleted => panic!(),
             QueryNode::Start => {
                 writeln!(file, "{node_idx} : START").unwrap();
@@ -600,32 +600,20 @@ shape: class"
             graph.edges_store[edge_idx as usize].as_ref().unwrap();
         let source_node = &graph.query_graph.nodes[*source_node as usize];
         let source_node_desc = match source_node {
-            QueryNode::Term(term) => match term.value {
+            QueryNode::Term(term) => {
-                QueryTerm::Phrase { phrase } => {
+                let term = ctx.term_interner.get(term.value);
-                    let phrase = ctx.phrase_interner.get(phrase);
+                ctx.word_interner.get(term.original).to_owned()
-                    phrase.description(&ctx.word_interner)
             }
-                QueryTerm::Word { derivations } => {
-                    let derivations = ctx.derivations_interner.get(derivations);
-                    ctx.word_interner.get(derivations.original).to_owned()
-                }
-            },
             QueryNode::Deleted => panic!(),
             QueryNode::Start => "START".to_owned(),
             QueryNode::End => "END".to_owned(),
         };
         let dest_node = &graph.query_graph.nodes[*dest_node as usize];
         let dest_node_desc = match dest_node {
-            QueryNode::Term(term) => match term.value {
+            QueryNode::Term(term) => {
-                QueryTerm::Phrase { phrase } => {
+                let term = ctx.term_interner.get(term.value);
-                    let phrase = ctx.phrase_interner.get(phrase);
+                ctx.word_interner.get(term.original).to_owned()
-                    phrase.description(&ctx.word_interner)
             }
-                QueryTerm::Word { derivations } => {
-                    let derivations = ctx.derivations_interner.get(derivations);
-                    ctx.word_interner.get(derivations.original).to_owned()
-                }
-            },
             QueryNode::Deleted => panic!(),
             QueryNode::Start => "START".to_owned(),
             QueryNode::End => "END".to_owned(),

milli/src/search/new/mod.rs

@@ -27,7 +27,7 @@ pub use ranking_rules::{bucket_sort, RankingRule, RankingRuleOutput, RankingRule
 use roaring::RoaringBitmap;
 
 use self::interner::Interner;
-use self::query_term::{Phrase, WordDerivations};
+use self::query_term::{Phrase, QueryTerm};
 use self::ranking_rules::PlaceholderQuery;
 use self::resolve_query_graph::{resolve_query_graph, QueryTermDocIdsCache};
 use crate::search::new::graph_based_ranking_rule::{Proximity, Typo};
@@ -41,8 +41,8 @@ pub struct SearchContext<'ctx> {
     pub db_cache: DatabaseCache<'ctx>,
     pub word_interner: Interner<String>,
     pub phrase_interner: Interner<Phrase>,
-    pub derivations_interner: Interner<WordDerivations>,
+    pub term_interner: Interner<QueryTerm>,
-    pub query_term_docids: QueryTermDocIdsCache,
+    pub term_docids: QueryTermDocIdsCache,
 }
 impl<'ctx> SearchContext<'ctx> {
     pub fn new(index: &'ctx Index, txn: &'ctx RoTxn<'ctx>) -> Self {
@@ -52,8 +52,8 @@ impl<'ctx> SearchContext<'ctx> {
             db_cache: <_>::default(),
             word_interner: <_>::default(),
             phrase_interner: <_>::default(),
-            derivations_interner: <_>::default(),
+            term_interner: <_>::default(),
-            query_term_docids: <_>::default(),
+            term_docids: <_>::default(),
         }
     }
 }

milli/src/search/new/query_graph.rs

@@ -45,7 +45,7 @@ For the search query `sunflower`, we need to register the following things:
 - and also the couple of adjacent words `sun flower`
 - as well as all the user-defined synonyms of `sunflower`
 
-All these derivations of a word will be stored in [`WordDerivations`].
+All these derivations of a word will be stored in [`QueryTerm`].
 
 ## Example 2:
 For the search query `summer house by`.
@@ -148,7 +148,7 @@ impl QueryGraph {
             let mut new_nodes = vec![];
             let new_node_idx = graph.add_node(&prev0, QueryNode::Term(term0.clone()));
             new_nodes.push(new_node_idx);
-            if term0.is_empty(&ctx.derivations_interner) {
+            if term0.is_empty(&ctx.term_interner) {
                 empty_nodes.push(new_node_idx);
             }
 

milli/src/search/new/query_term.rs

@@ -30,16 +30,20 @@ impl Phrase {
 /// A structure storing all the different ways to match
 /// a term in the user's search query.
 #[derive(Clone, PartialEq, Eq, Hash)]
-pub struct WordDerivations {
+pub struct QueryTerm {
     /// The original terms, for debugging purposes
     pub original: Interned<String>,
+    /// Whether the term is an ngram
+    pub is_ngram: bool,
+    /// Whether the term can be only the prefix of a word
     pub is_prefix: bool,
-
+    /// The original phrase, if any
-    /// A single word equivalent to the original one, with zero typos
+    pub phrase: Option<Interned<Phrase>>,
+    /// A single word equivalent to the original term, with zero typos
     pub zero_typo: Option<Interned<String>>,
     /// All the words that contain the original word as prefix
     pub prefix_of: Box<[Interned<String>]>,
-    /// All the synonyms of the original word
+    /// All the synonyms of the original word or phrase
     pub synonyms: Box<[Interned<Phrase>]>,
 
     /// The original word split into multiple consecutive words
@@ -54,10 +58,15 @@ pub struct WordDerivations {
     /// A prefix in the prefix databases matching the original word
     pub use_prefix_db: Option<Interned<String>>,
 }
-impl WordDerivations {
+impl QueryTerm {
-    pub fn empty(word_interner: &mut Interner<String>, original: &str) -> Self {
+    pub fn phrase(
+        word_interner: &mut Interner<String>,
+        phrase_interner: &mut Interner<Phrase>,
+        phrase: Phrase,
+    ) -> Self {
         Self {
-            original: word_interner.insert(original.to_owned()),
+            original: word_interner.insert(phrase.description(word_interner)),
+            phrase: Some(phrase_interner.insert(phrase)),
             is_prefix: false,
             zero_typo: None,
             prefix_of: Box::new([]),
@@ -66,12 +75,28 @@ impl WordDerivations {
             one_typo: Box::new([]),
             two_typos: Box::new([]),
             use_prefix_db: None,
+            is_ngram: false,
+        }
+    }
+    pub fn empty(word_interner: &mut Interner<String>, original: &str) -> Self {
+        Self {
+            original: word_interner.insert(original.to_owned()),
+            phrase: None,
+            is_prefix: false,
+            zero_typo: None,
+            prefix_of: Box::new([]),
+            synonyms: Box::new([]),
+            split_words: None,
+            one_typo: Box::new([]),
+            two_typos: Box::new([]),
+            use_prefix_db: None,
+            is_ngram: false,
         }
     }
     /// Return an iterator over all the single words derived from the original word.
     ///
     /// This excludes synonyms, split words, and words stored in the prefix databases.
-    pub fn all_single_word_derivations_except_prefix_db(
+    pub fn all_single_words_except_prefix_db(
         &'_ self,
     ) -> impl Iterator<Item = Interned<String>> + Clone + '_ {
         self.zero_typo
@@ -84,7 +109,7 @@ impl WordDerivations {
     /// Return an iterator over all the single words derived from the original word.
     ///
     /// This excludes synonyms, split words, and words stored in the prefix databases.
-    pub fn all_phrase_derivations(&'_ self) -> impl Iterator<Item = Interned<Phrase>> + Clone + '_ {
+    pub fn all_phrases(&'_ self) -> impl Iterator<Item = Interned<Phrase>> + Clone + '_ {
         self.split_words.iter().chain(self.synonyms.iter()).copied()
     }
     pub fn is_empty(&self) -> bool {
@@ -98,15 +123,15 @@ impl WordDerivations {
     }
 }
 
-/// Compute the word derivations for the given word
+/// Compute the query term for the given word
-pub fn word_derivations(
+pub fn query_term_from_word(
     ctx: &mut SearchContext,
     word: &str,
     max_typo: u8,
     is_prefix: bool,
-) -> Result<WordDerivations> {
+) -> Result<QueryTerm> {
     if word.len() > MAX_WORD_LENGTH {
-        return Ok(WordDerivations::empty(&mut ctx.word_interner, word));
+        return Ok(QueryTerm::empty(&mut ctx.word_interner, word));
     }
 
     let fst = ctx.index.words_fst(ctx.txn)?;
@@ -223,8 +248,9 @@ pub fn word_derivations(
         })
         .collect();
 
-    Ok(WordDerivations {
+    Ok(QueryTerm {
         original: word_interned,
+        phrase: None,
         is_prefix,
         zero_typo,
         prefix_of: prefix_of.into_boxed_slice(),
@@ -233,6 +259,7 @@ pub fn word_derivations(
         one_typo: one_typo.into_boxed_slice(),
         two_typos: two_typos.into_boxed_slice(),
         use_prefix_db,
+        is_ngram: false,
     })
 }
 
@@ -266,35 +293,13 @@ fn split_best_frequency(
     Ok(best.map(|(_, left, right)| (left.to_owned(), right.to_owned())))
 }
 
-#[derive(Clone, PartialEq, Eq, Hash)]
-pub enum QueryTerm {
-    Phrase { phrase: Interned<Phrase> },
-    // TODO: change to `Interned<WordDerivations>`?
-    Word { derivations: Interned<WordDerivations> },
-}
-
 impl QueryTerm {
-    pub fn is_prefix(&self, derivations_interner: &Interner<WordDerivations>) -> bool {
-        match self {
-            QueryTerm::Phrase { .. } => false,
-            QueryTerm::Word { derivations } => derivations_interner.get(*derivations).is_prefix,
-        }
-    }
     /// Return the original word from the given query term
-    pub fn original_single_word(
+    pub fn original_single_word(&self) -> Option<Interned<String>> {
-        &self,
+        if self.phrase.is_some() || self.is_ngram {
-        derivations_interner: &Interner<WordDerivations>,
-    ) -> Option<Interned<String>> {
-        match self {
-            QueryTerm::Phrase { phrase: _ } => None,
-            QueryTerm::Word { derivations } => {
-                let derivations = derivations_interner.get(*derivations);
-                if derivations.is_empty() {
             None
         } else {
-                    Some(derivations.original)
+            Some(self.original)
-                }
-            }
         }
     }
 }
@@ -302,19 +307,14 @@ impl QueryTerm {
 /// A query term term coupled with its position in the user's search query.
 #[derive(Clone)]
 pub struct LocatedQueryTerm {
-    pub value: QueryTerm,
+    pub value: Interned<QueryTerm>,
     pub positions: RangeInclusive<i8>,
 }
 
 impl LocatedQueryTerm {
-    /// Return `true` iff the word derivations within the query term are empty
+    /// Return `true` iff the term is empty
-    pub fn is_empty(&self, interner: &Interner<WordDerivations>) -> bool {
+    pub fn is_empty(&self, interner: &Interner<QueryTerm>) -> bool {
-        match self.value {
+        interner.get(self.value).is_empty()
-            // TODO: phrases should be greedily computed, so that they can be excluded from
-            // the query graph right from the start?
-            QueryTerm::Phrase { phrase: _ } => false,
-            QueryTerm::Word { derivations, .. } => interner.get(derivations).is_empty(),
-        }
     }
 }
 
@@ -360,18 +360,16 @@ pub fn located_query_terms_from_string<'ctx>(
                     } else {
                         let word = ctx.word_interner.insert(token.lemma().to_string());
                         // TODO: in a phrase, check that every word exists
-                        // otherwise return WordDerivations::Empty
+                        // otherwise return an empty term
                         phrase.push(Some(word));
                     }
                 } else if peekable.peek().is_some() {
                     match token.kind {
                         TokenKind::Word => {
                             let word = token.lemma();
-                            let derivations = word_derivations(ctx, word, nbr_typos(word), false)?;
+                            let term = query_term_from_word(ctx, word, nbr_typos(word), false)?;
                             let located_term = LocatedQueryTerm {
-                                value: QueryTerm::Word {
+                                value: ctx.term_interner.insert(term),
-                                    derivations: ctx.derivations_interner.insert(derivations),
-                                },
                                 positions: position..=position,
                             };
                             located_terms.push(located_term);
@@ -380,11 +378,9 @@ pub fn located_query_terms_from_string<'ctx>(
                     }
                 } else {
                     let word = token.lemma();
-                    let derivations = word_derivations(ctx, word, nbr_typos(word), true)?;
+                    let term = query_term_from_word(ctx, word, nbr_typos(word), true)?;
                     let located_term = LocatedQueryTerm {
-                        value: QueryTerm::Word {
+                        value: ctx.term_interner.insert(term),
-                            derivations: ctx.derivations_interner.insert(derivations),
-                        },
                         positions: position..=position,
                     };
                     located_terms.push(located_term);
@@ -408,11 +404,11 @@ pub fn located_query_terms_from_string<'ctx>(
                 if !phrase.is_empty() && (quote_count > 0 || separator_kind == SeparatorKind::Hard)
                 {
                     let located_query_term = LocatedQueryTerm {
-                        value: QueryTerm::Phrase {
+                        value: ctx.term_interner.insert(QueryTerm::phrase(
-                            phrase: ctx
+                            &mut ctx.word_interner,
-                                .phrase_interner
+                            &mut ctx.phrase_interner,
-                                .insert(Phrase { words: mem::take(&mut phrase) }),
+                            Phrase { words: mem::take(&mut phrase) },
-                        },
+                        )),
                         positions: phrase_start..=phrase_end,
                     };
                     located_terms.push(located_query_term);
@@ -425,9 +421,11 @@ pub fn located_query_terms_from_string<'ctx>(
     // If a quote is never closed, we consider all of the end of the query as a phrase.
     if !phrase.is_empty() {
         let located_query_term = LocatedQueryTerm {
-            value: QueryTerm::Phrase {
+            value: ctx.term_interner.insert(QueryTerm::phrase(
-                phrase: ctx.phrase_interner.insert(Phrase { words: mem::take(&mut phrase) }),
+                &mut ctx.word_interner,
-            },
+                &mut ctx.phrase_interner,
+                Phrase { words: mem::take(&mut phrase) },
+            )),
             positions: phrase_start..=phrase_end,
         };
         located_terms.push(located_query_term);
@@ -474,8 +472,7 @@ pub fn make_ngram(
     }
     let mut words_interned = vec![];
     for term in terms {
-        if let Some(original_term_word) = term.value.original_single_word(&ctx.derivations_interner)
+        if let Some(original_term_word) = ctx.term_interner.get(term.value).original_single_word() {
-        {
             words_interned.push(original_term_word);
         } else {
             return Ok(None);
@@ -486,121 +483,40 @@ pub fn make_ngram(
 
     let start = *terms.first().as_ref().unwrap().positions.start();
     let end = *terms.last().as_ref().unwrap().positions.end();
-    let is_prefix = terms.last().as_ref().unwrap().value.is_prefix(&ctx.derivations_interner);
+    let is_prefix = ctx.term_interner.get(terms.last().as_ref().unwrap().value).is_prefix;
     let ngram_str = words.join("");
     if ngram_str.len() > MAX_WORD_LENGTH {
         return Ok(None);
     }
 
-    let mut derivations = word_derivations(
+    let mut term = query_term_from_word(
         ctx,
         &ngram_str,
         number_of_typos_allowed(ngram_str.as_str()).saturating_sub(terms.len() as u8),
         is_prefix,
     )?;
-    derivations.original = ctx.word_interner.insert(words.join(" "));
+    term.original = ctx.word_interner.insert(words.join(" "));
     // Now add the synonyms
     let index_synonyms = ctx.index.synonyms(ctx.txn)?;
-    let mut derivations_synonyms = derivations.synonyms.to_vec();
+    let mut term_synonyms = term.synonyms.to_vec();
-    derivations_synonyms.extend(
+    term_synonyms.extend(index_synonyms.get(&words).cloned().unwrap_or_default().into_iter().map(
-        index_synonyms.get(&words).cloned().unwrap_or_default().into_iter().map(|words| {
+        |words| {
             let words = words.into_iter().map(|w| Some(ctx.word_interner.insert(w))).collect();
             ctx.phrase_interner.insert(Phrase { words })
-        }),
+        },
-    );
+    ));
-    derivations.synonyms = derivations_synonyms.into_boxed_slice();
+    term.synonyms = term_synonyms.into_boxed_slice();
-    if let Some(split_words) = derivations.split_words {
+    if let Some(split_words) = term.split_words {
         let split_words = ctx.phrase_interner.get(split_words);
         if split_words.words == words_interned.iter().map(|&i| Some(i)).collect::<Vec<_>>() {
-            derivations.split_words = None;
+            term.split_words = None;
         }
     }
-    if derivations.is_empty() {
+    if term.is_empty() {
         return Ok(None);
     }
-    let term = LocatedQueryTerm {
+    term.is_ngram = true;
-        value: QueryTerm::Word { derivations: ctx.derivations_interner.insert(derivations) },
+    let term = LocatedQueryTerm { value: ctx.term_interner.insert(term), positions: start..=end };
-        positions: start..=end,
-    };
 
     Ok(Some(term))
 }
-
-// // TODO: return a word derivations instead?
-// pub fn ngram2(
-//     ctx: &mut SearchContext,
-//     x: &LocatedQueryTerm,
-//     y: &LocatedQueryTerm,
-//     number_of_typos_allowed: impl Fn(&str) -> u8,
-// ) -> Result<Option<LocatedQueryTerm>> {
-//     if *x.positions.end() != y.positions.start() - 1 {
-//         return Ok(None);
-//     }
-//     match (
-//         x.value.original_single_word(&ctx.word_interner, &ctx.derivations_interner),
-//         y.value.original_single_word(&ctx.word_interner, &ctx.derivations_interner),
-//     ) {
-//         (Some(w1), Some(w2)) => {
-//             let ngram2_str = format!("{w1}{w2}");
-//             let mut derivations = word_derivations(
-//                 ctx,
-//                 &ngram2_str,
-//                 number_of_typos_allowed(ngram2_str.as_str()).saturating_sub(1),
-//                 y.value.is_prefix(&ctx.derivations_interner),
-//             )?;
-//             // Now add the synonyms
-//             let index_synonyms = ctx.index.synonyms(ctx.txn)?;
-//             let mut derivations_synonyms = derivations.synonyms.to_vec();
-//             derivations_synonyms.extend(
-//                 index_synonyms
-//                     .get(&vec![w1.to_owned(), w2.to_owned()])
-//                     .cloned()
-//                     .unwrap_or_default()
-//                     .into_iter()
-//                     .map(|words| {
-//                         let words =
-//                             words.into_iter().map(|w| Some(ctx.word_interner.insert(w))).collect();
-//                         ctx.phrase_interner.insert(Phrase { words })
-//                     }),
-//             );
-
-//             let term = LocatedQueryTerm {
-//                 value: QueryTerm::Word {
-//                     derivations: ctx.derivations_interner.insert(derivations),
-//                 },
-//                 positions: *x.positions.start()..=*y.positions.end(),
-//             };
-
-//             Ok(Some(term))
-//         }
-//         _ => Ok(None),
-//     }
-// }
-
-// // TODO: return a word derivations instead?
-// pub fn ngram3(
-//     ctx: &mut SearchContext,
-//     x: &LocatedQueryTerm,
-//     y: &LocatedQueryTerm,
-//     z: &LocatedQueryTerm,
-// ) -> Option<(Interned<String>, RangeInclusive<i8>)> {
-//     if *x.positions.end() != y.positions.start() - 1
-//         || *y.positions.end() != z.positions.start() - 1
-//     {
-//         return None;
-//     }
-//     match (
-//         &x.value.original_single_word(&ctx.word_interner, &ctx.derivations_interner),
-//         &y.value.original_single_word(&ctx.word_interner, &ctx.derivations_interner),
-//         &z.value.original_single_word(&ctx.word_interner, &ctx.derivations_interner),
-//     ) {
-//         (Some(w1), Some(w2), Some(w3)) => {
-//             let term = (
-//                 ctx.word_interner.insert(format!("{w1}{w2}{w3}")),
-//                 *x.positions.start()..=*z.positions.end(),
-//             );
-//             Some(term)
-//         }
-//         _ => None,
-//     }
-// }

milli/src/search/new/ranking_rule_graph/build.rs

@@ -22,28 +22,21 @@ impl<G: RankingRuleGraphTrait> RankingRuleGraph<G> {
         let mut edges_store = vec![];
         let mut edges_of_node = vec![];
 
-        for (node_idx, node) in graph_nodes.iter().enumerate() {
+        for (source_idx, source_node) in graph_nodes.iter().enumerate() {
             edges_of_node.push(HashSet::new());
             let new_edges = edges_of_node.last_mut().unwrap();
 
-            let Some(source_node_data) = G::build_step_visit_source_node(ctx, node)? else { continue };
+            for dest_idx in graph_edges[source_idx].successors.iter() {
-
+                let dest_node = &graph_nodes[dest_idx as usize];
-            for successor_idx in graph_edges[node_idx].successors.iter() {
+                let edges = G::build_edges(ctx, &mut conditions_interner, source_node, dest_node)?;
-                let dest_node = &graph_nodes[successor_idx as usize];
-                let edges = G::build_step_visit_destination_node(
-                    ctx,
-                    &mut conditions_interner,
-                    dest_node,
-                    &source_node_data,
-                )?;
                 if edges.is_empty() {
                     continue;
                 }
 
                 for (cost, condition) in edges {
                     edges_store.push(Some(Edge {
-                        source_node: node_idx as u16,
+                        source_node: source_idx as u16,
-                        dest_node: successor_idx,
+                        dest_node: dest_idx,
                         cost,
                         condition,
                     }));

milli/src/search/new/ranking_rule_graph/mod.rs

@@ -80,11 +80,6 @@ pub trait RankingRuleGraphTrait: Sized {
     /// in [`resolve_edge_condition`](RankingRuleGraphTrait::resolve_edge_condition).
     type EdgeCondition: Sized + Clone + PartialEq + Eq + Hash;
 
-    /// A structure used in the construction of the graph, created when a
-    /// query graph source node is visited. It is used to determine the cost
-    /// and condition of a ranking rule edge when the destination node is visited.
-    type BuildVisitedFromNode;
-
     /// Return the label of the given edge condition, to be used when visualising
     /// the ranking rule graph.
     fn label_for_edge_condition(edge: &Self::EdgeCondition) -> String;
@@ -97,22 +92,13 @@ pub trait RankingRuleGraphTrait: Sized {
         universe: &RoaringBitmap,
     ) -> Result<RoaringBitmap>;
 
-    /// Prepare to build the edges outgoing from `source_node`.
-    ///
-    /// This call is followed by zero, one or more calls to [`build_step_visit_destination_node`](RankingRuleGraphTrait::build_step_visit_destination_node),
-    /// which builds the actual edges.
-    fn build_step_visit_source_node<'ctx>(
-        ctx: &mut SearchContext<'ctx>,
-        source_node: &QueryNode,
-    ) -> Result<Option<Self::BuildVisitedFromNode>>;
-
     /// Return the cost and condition of the edges going from the previously visited node
     /// (with [`build_step_visit_source_node`](RankingRuleGraphTrait::build_step_visit_source_node)) to `dest_node`.
-    fn build_step_visit_destination_node<'from_data, 'ctx: 'from_data>(
+    fn build_edges<'ctx>(
         ctx: &mut SearchContext<'ctx>,
         conditions_interner: &mut Interner<Self::EdgeCondition>,
+        source_node: &QueryNode,
         dest_node: &QueryNode,
-        source_node_data: &'from_data Self::BuildVisitedFromNode,
     ) -> Result<Vec<(u8, EdgeCondition<Self::EdgeCondition>)>>;
 
     fn log_state(

milli/src/search/new/ranking_rule_graph/proximity/build.rs

@@ -4,89 +4,40 @@ use std::collections::BTreeMap;
 use super::ProximityEdge;
 use crate::search::new::db_cache::DatabaseCache;
 use crate::search::new::interner::{Interned, Interner};
-use crate::search::new::query_term::{LocatedQueryTerm, Phrase, QueryTerm, WordDerivations};
+use crate::search::new::query_term::{LocatedQueryTerm, Phrase, QueryTerm};
 use crate::search::new::ranking_rule_graph::proximity::WordPair;
 use crate::search::new::ranking_rule_graph::EdgeCondition;
 use crate::search::new::{QueryNode, SearchContext};
 use crate::Result;
 use heed::RoTxn;
 
-pub fn visit_from_node(
+fn last_word_of_term_iter<'t>(
-    ctx: &mut SearchContext,
+    t: &'t QueryTerm,
-    from_node: &QueryNode,
+    phrase_interner: &'t Interner<Phrase>,
-) -> Result<Option<(Vec<(Option<Interned<Phrase>>, Interned<String>)>, i8)>> {
+) -> impl Iterator<Item = (Option<Interned<Phrase>>, Interned<String>)> + 't {
-    let SearchContext { derivations_interner, .. } = ctx;
+    t.all_single_words_except_prefix_db().map(|w| (None, w)).chain(t.all_phrases().flat_map(
-
+        move |p| {
-    let (left_phrase, left_derivations, left_end_position) = match from_node {
+            let phrase = phrase_interner.get(p);
-        QueryNode::Term(LocatedQueryTerm { value: value1, positions: pos1 }) => {
+            phrase.words.last().unwrap().map(|last| (Some(p), last))
-            match value1 {
-                QueryTerm::Word { derivations } => {
-                    (None, derivations_interner.get(*derivations).clone(), *pos1.end())
-                }
-                QueryTerm::Phrase { phrase: phrase_interned } => {
-                    let phrase = ctx.phrase_interner.get(*phrase_interned);
-                    if let Some(original) = *phrase.words.last().unwrap() {
-                        (
-                            Some(*phrase_interned),
-                            WordDerivations {
-                                original,
-                                zero_typo: Some(original),
-                                one_typo: Box::new([]),
-                                two_typos: Box::new([]),
-                                use_prefix_db: None,
-                                synonyms: Box::new([]),
-                                split_words: None,
-                                is_prefix: false,
-                                prefix_of: Box::new([]),
         },
-                            *pos1.end(),
+    ))
-                        )
+}
-                    } else {
+fn first_word_of_term_iter<'t>(
-                        // No word pairs if the phrase does not have a regular word as its last term
+    t: &'t QueryTerm,
-                        return Ok(None);
+    phrase_interner: &'t Interner<Phrase>,
-                    }
+) -> impl Iterator<Item = (Interned<String>, Option<Interned<Phrase>>)> + 't {
-                }
+    t.all_single_words_except_prefix_db().map(|w| (w, None)).chain(t.all_phrases().flat_map(
-            }
+        move |p| {
-        }
+            let phrase = phrase_interner.get(p);
-        QueryNode::Start => (None, WordDerivations::empty(&mut ctx.word_interner, ""), -1),
+            phrase.words.first().unwrap().map(|first| (first, Some(p)))
-        _ => return Ok(None),
+        },
-    };
+    ))
-
-    // left term cannot be a prefix
-    assert!(left_derivations.use_prefix_db.is_none() && !left_derivations.is_prefix);
-
-    let last_word_left_phrase = if let Some(left_phrase_interned) = left_phrase {
-        let left_phrase = ctx.phrase_interner.get(left_phrase_interned);
-        left_phrase.words.last().copied().unwrap()
-    } else {
-        None
-    };
-    let left_single_word_iter: Vec<(Option<Interned<Phrase>>, Interned<String>)> = left_derivations
-        .all_single_word_derivations_except_prefix_db()
-        .chain(last_word_left_phrase.iter().copied())
-        .map(|w| (left_phrase, w))
-        .collect();
-    let left_phrase_iter: Vec<(Option<Interned<Phrase>>, Interned<String>)> = left_derivations
-        .all_phrase_derivations()
-        .map(|left_phrase_interned: Interned<Phrase>| {
-            let left_phrase = ctx.phrase_interner.get(left_phrase_interned);
-            let last_word_left_phrase: Interned<String> =
-                left_phrase.words.last().unwrap().unwrap();
-            let r: (Option<Interned<Phrase>>, Interned<String>) =
-                (Some(left_phrase_interned), last_word_left_phrase);
-            r
-        })
-        .collect();
-    let mut left_word_iter = left_single_word_iter;
-    left_word_iter.extend(left_phrase_iter);
-
-    Ok(Some((left_word_iter, left_end_position)))
 }
 
-pub fn build_step_visit_destination_node<'ctx, 'from_data>(
+pub fn build_edges<'ctx>(
     ctx: &mut SearchContext<'ctx>,
     conditions_interner: &mut Interner<ProximityEdge>,
-    from_node_data: &'from_data (Vec<(Option<Interned<Phrase>>, Interned<String>)>, i8),
+    from_node: &QueryNode,
     to_node: &QueryNode,
 ) -> Result<Vec<(u8, EdgeCondition<ProximityEdge>)>> {
     let SearchContext {
@@ -95,9 +46,19 @@ pub fn build_step_visit_destination_node<'ctx, 'from_data>(
         db_cache,
         word_interner,
         phrase_interner,
-        derivations_interner,
+        term_interner,
-        query_term_docids: _,
+        term_docids: _,
     } = ctx;
+
+    let (left_term, left_end_position) = match from_node {
+        QueryNode::Term(LocatedQueryTerm { value, positions }) => {
+            (term_interner.get(*value), *positions.end())
+        }
+        QueryNode::Deleted => return Ok(vec![]),
+        QueryNode::Start => return Ok(vec![(0, EdgeCondition::Unconditional)]),
+        QueryNode::End => return Ok(vec![]),
+    };
+
     let right_term = match &to_node {
         QueryNode::End => return Ok(vec![(0, EdgeCondition::Unconditional)]),
         QueryNode::Deleted | QueryNode::Start => return Ok(vec![]),
@@ -105,47 +66,14 @@ pub fn build_step_visit_destination_node<'ctx, 'from_data>(
     };
     let LocatedQueryTerm { value: right_value, positions: right_positions } = right_term;
 
-    let (right_phrase, right_derivations, right_start_position, right_ngram_length) =
+    let (right_term, right_start_position, right_ngram_length) =
-        match right_value {
+        (term_interner.get(*right_value), *right_positions.start(), right_positions.len());
-            QueryTerm::Word { derivations } => (
-                None,
-                derivations_interner.get(*derivations).clone(),
-                *right_positions.start(),
-                right_positions.len(),
-            ),
-            QueryTerm::Phrase { phrase: right_phrase_interned } => {
-                let right_phrase = phrase_interner.get(*right_phrase_interned);
-                if let Some(original) = *right_phrase.words.first().unwrap() {
-                    (
-                        Some(*right_phrase_interned),
-                        WordDerivations {
-                            original,
-                            zero_typo: Some(original),
-                            one_typo: Box::new([]),
-                            two_typos: Box::new([]),
-                            use_prefix_db: None,
-                            synonyms: Box::new([]),
-                            split_words: None,
-                            is_prefix: false,
-                            prefix_of: Box::new([]),
-                        },
-                        *right_positions.start(),
-                        1,
-                    )
-                } else {
-                    // No word pairs if the phrase does not have a regular word as its first term
-                    return Ok(vec![]);
-                }
-            }
-        };
-
-    let (left_derivations, left_end_position) = from_node_data;
 
     if left_end_position + 1 != right_start_position {
         // We want to ignore this pair of terms
         // Unconditionally walk through the edge without computing the docids
         // This can happen when, in a query like `the sun flowers are beautiful`, the term
-        // `flowers` is removed by the words ranking rule due to the terms matching strategy.
+        // `flowers` is removed by the `words` ranking rule.
         // The remaining query graph represents `the sun .. are beautiful`
         // but `sun` and `are` have no proximity condition between them
         return Ok(vec![(0, EdgeCondition::Unconditional)]);
@@ -153,8 +81,8 @@ pub fn build_step_visit_destination_node<'ctx, 'from_data>(
 
     let mut cost_proximity_word_pairs = BTreeMap::<u8, BTreeMap<u8, Vec<WordPair>>>::new();
 
-    if let Some(right_prefix) = right_derivations.use_prefix_db {
+    if let Some(right_prefix) = right_term.use_prefix_db {
-        for (left_phrase, left_word) in left_derivations.iter().copied() {
+        for (left_phrase, left_word) in last_word_of_term_iter(left_term, phrase_interner) {
             add_prefix_edges(
                 index,
                 txn,
@@ -172,37 +100,12 @@ pub fn build_step_visit_destination_node<'ctx, 'from_data>(
     // TODO: add safeguard in case the cartesian product is too large!
     // even if we restrict the word derivations to a maximum of 100, the size of the
     // caterisan product could reach a maximum of 10_000 derivations, which is way too much.
-    // mMaybe prioritise the product of zero typo derivations, then the product of zero-typo/one-typo
+    // Maybe prioritise the product of zero typo derivations, then the product of zero-typo/one-typo
     // + one-typo/zero-typo, then one-typo/one-typo, then ... until an arbitrary limit has been
     // reached
-    let first_word_right_phrase = if let Some(right_phrase_interned) = right_phrase {
-        let right_phrase = phrase_interner.get(right_phrase_interned);
-        right_phrase.words.first().copied().unwrap()
-    } else {
-        None
-    };
-    let right_single_word_iter: Vec<(Option<Interned<Phrase>>, Interned<String>)> =
-        right_derivations
-            .all_single_word_derivations_except_prefix_db()
-            .chain(first_word_right_phrase.iter().copied())
-            .map(|w| (right_phrase, w))
-            .collect();
-    let right_phrase_iter: Vec<(Option<Interned<Phrase>>, Interned<String>)> = right_derivations
-        .all_phrase_derivations()
-        .map(|right_phrase_interned: Interned<Phrase>| {
-            let right_phrase = phrase_interner.get(right_phrase_interned);
-            let first_word_right_phrase: Interned<String> =
-                right_phrase.words.first().unwrap().unwrap();
-            let r: (Option<Interned<Phrase>>, Interned<String>) =
-                (Some(right_phrase_interned), first_word_right_phrase);
-            r
-        })
-        .collect();
-    let mut right_word_iter = right_single_word_iter;
-    right_word_iter.extend(right_phrase_iter);
 
-    for (left_phrase, left_word) in left_derivations.iter().copied() {
+    for (left_phrase, left_word) in last_word_of_term_iter(left_term, phrase_interner) {
-        for (right_phrase, right_word) in right_word_iter.iter().copied() {
+        for (right_word, right_phrase) in first_word_of_term_iter(right_term, phrase_interner) {
             add_non_prefix_edges(
                 index,
                 txn,

milli/src/search/new/ranking_rule_graph/proximity/compute_docids.rs

@@ -29,7 +29,7 @@ pub fn compute_docids<'ctx>(
                     .unwrap_or_default();
                 if !docids.is_empty() {
                     for phrase in phrases {
-                        docids &= ctx.query_term_docids.get_phrase_docids(
+                        docids &= ctx.term_docids.get_phrase_docids(
                             index,
                             txn,
                             db_cache,
@@ -56,7 +56,7 @@ pub fn compute_docids<'ctx>(
                     .unwrap_or_default();
                 if !docids.is_empty() {
                     for phrase in phrases {
-                        docids &= ctx.query_term_docids.get_phrase_docids(
+                        docids &= ctx.term_docids.get_phrase_docids(
                             index,
                             txn,
                             db_cache,

milli/src/search/new/ranking_rule_graph/proximity/mod.rs

@@ -40,7 +40,6 @@ pub enum ProximityGraph {}
 
 impl RankingRuleGraphTrait for ProximityGraph {
     type EdgeCondition = ProximityEdge;
-    type BuildVisitedFromNode = (Vec<(Option<Interned<Phrase>>, Interned<String>)>, i8);
 
     fn label_for_edge_condition(edge: &Self::EdgeCondition) -> String {
         let ProximityEdge { pairs, proximity } = edge;
@@ -55,25 +54,13 @@ impl RankingRuleGraphTrait for ProximityGraph {
         compute_docids::compute_docids(ctx, edge, universe)
     }
 
-    fn build_step_visit_source_node<'ctx>(
+    fn build_edges<'ctx>(
-        ctx: &mut SearchContext<'ctx>,
-        from_node: &QueryNode,
-    ) -> Result<Option<Self::BuildVisitedFromNode>> {
-        build::visit_from_node(ctx, from_node)
-    }
-
-    fn build_step_visit_destination_node<'from_data, 'ctx: 'from_data>(
         ctx: &mut SearchContext<'ctx>,
         conditions_interner: &mut Interner<Self::EdgeCondition>,
+        source_node: &QueryNode,
         dest_node: &QueryNode,
-        source_node_data: &'from_data Self::BuildVisitedFromNode,
     ) -> Result<Vec<(u8, EdgeCondition<Self::EdgeCondition>)>> {
-        build::build_step_visit_destination_node(
+        build::build_edges(ctx, conditions_interner, source_node, dest_node)
-            ctx,
-            conditions_interner,
-            source_node_data,
-            dest_node,
-        )
     }
 
     fn log_state(

milli/src/search/new/ranking_rule_graph/typo/mod.rs

@@ -4,28 +4,24 @@ use super::empty_paths_cache::EmptyPathsCache;
 use super::{EdgeCondition, RankingRuleGraph, RankingRuleGraphTrait};
 use crate::search::new::interner::{Interned, Interner};
 use crate::search::new::logger::SearchLogger;
-use crate::search::new::query_term::{LocatedQueryTerm, Phrase, QueryTerm, WordDerivations};
+use crate::search::new::query_term::{LocatedQueryTerm, QueryTerm};
 use crate::search::new::small_bitmap::SmallBitmap;
 use crate::search::new::{QueryGraph, QueryNode, SearchContext};
 use crate::Result;
 
 #[derive(Clone, PartialEq, Eq, Hash)]
-pub enum TypoEdge {
+pub struct TypoEdge {
-    Phrase { phrase: Interned<Phrase> },
+    term: Interned<QueryTerm>,
-    Word { derivations: Interned<WordDerivations>, nbr_typos: u8 },
+    nbr_typos: u8,
 }
 
 pub enum TypoGraph {}
 
 impl RankingRuleGraphTrait for TypoGraph {
     type EdgeCondition = TypoEdge;
-    type BuildVisitedFromNode = ();
 
     fn label_for_edge_condition(edge: &Self::EdgeCondition) -> String {
-        match edge {
+        format!(", {} typos", edge.nbr_typos)
-            TypoEdge::Phrase { .. } => ", 0 typos".to_owned(),
-            TypoEdge::Word { nbr_typos, .. } => format!(", {nbr_typos} typos"),
-        }
     }
 
     fn resolve_edge_condition<'db_cache, 'ctx>(
@@ -39,59 +35,33 @@ impl RankingRuleGraphTrait for TypoGraph {
             db_cache,
             word_interner,
             phrase_interner,
-            derivations_interner,
+            term_interner,
-            query_term_docids,
+            term_docids: query_term_docids,
         } = ctx;
-        match edge {
+
-            &TypoEdge::Phrase { phrase } => Ok(universe
-                & query_term_docids.get_phrase_docids(
-                    index,
-                    txn,
-                    db_cache,
-                    word_interner,
-                    phrase_interner,
-                    phrase,
-                )?),
-            TypoEdge::Word { derivations, .. } => {
         let docids = universe
-                    & query_term_docids.get_word_derivations_docids(
+            & query_term_docids.get_query_term_docids(
                 index,
                 txn,
                 db_cache,
                 word_interner,
-                        derivations_interner,
+                term_interner,
                 phrase_interner,
-                        *derivations,
+                edge.term,
             )?;
 
         Ok(docids)
     }
-        }
-    }
 
-    fn build_step_visit_source_node<'ctx>(
+    fn build_edges<'ctx>(
-        _ctx: &mut SearchContext<'ctx>,
-        _from_node: &QueryNode,
-    ) -> Result<Option<Self::BuildVisitedFromNode>> {
-        Ok(Some(()))
-    }
-
-    fn build_step_visit_destination_node<'from_data, 'ctx: 'from_data>(
         ctx: &mut SearchContext<'ctx>,
         conditions_interner: &mut Interner<Self::EdgeCondition>,
+        _from_node: &QueryNode,
         to_node: &QueryNode,
-        _from_node_data: &'from_data Self::BuildVisitedFromNode,
     ) -> Result<Vec<(u8, EdgeCondition<Self::EdgeCondition>)>> {
-        let SearchContext { derivations_interner, .. } = ctx;
+        let SearchContext { term_interner, .. } = ctx;
         match to_node {
-            QueryNode::Term(LocatedQueryTerm { value, positions }) => match *value {
+            QueryNode::Term(LocatedQueryTerm { value, positions }) => {
-                QueryTerm::Phrase { phrase } => Ok(vec![(
-                    0,
-                    EdgeCondition::Conditional(
-                        conditions_interner.insert(TypoEdge::Phrase { phrase }),
-                    ),
-                )]),
-                QueryTerm::Word { derivations } => {
                 let mut edges = vec![];
                 // Ngrams have a base typo cost
                 // 2-gram -> equivalent to 1 typo
@@ -99,64 +69,67 @@ impl RankingRuleGraphTrait for TypoGraph {
                 let base_cost = positions.len().max(2) as u8;
 
                 for nbr_typos in 0..=2 {
-                        let derivations = derivations_interner.get(derivations).clone();
+                    let term = term_interner.get(*value).clone();
-                        let new_derivations = match nbr_typos {
+                    let new_term = match nbr_typos {
-                            0 => WordDerivations {
+                        0 => QueryTerm {
-                                original: derivations.original,
+                            original: term.original,
-                                is_prefix: derivations.is_prefix,
+                            is_prefix: term.is_prefix,
-                                zero_typo: derivations.zero_typo,
+                            zero_typo: term.zero_typo,
-                                prefix_of: derivations.prefix_of,
+                            prefix_of: term.prefix_of,
-                                synonyms: derivations.synonyms,
+                            synonyms: term.synonyms,
                             split_words: None,
                             one_typo: Box::new([]),
                             two_typos: Box::new([]),
-                                use_prefix_db: derivations.use_prefix_db,
+                            use_prefix_db: term.use_prefix_db,
+                            is_ngram: term.is_ngram,
+                            phrase: term.phrase,
                         },
                         1 => {
                             // What about split words and synonyms here?
-                                WordDerivations {
+                            QueryTerm {
-                                    original: derivations.original,
+                                original: term.original,
                                 is_prefix: false,
                                 zero_typo: None,
                                 prefix_of: Box::new([]),
                                 synonyms: Box::new([]),
-                                    split_words: derivations.split_words,
+                                split_words: term.split_words,
-                                    one_typo: derivations.one_typo,
+                                one_typo: term.one_typo,
                                 two_typos: Box::new([]),
                                 use_prefix_db: None, // false because all items from use_prefix_db have 0 typos
+                                is_ngram: term.is_ngram,
+                                phrase: None,
                             }
                         }
                         2 => {
                             // What about split words and synonyms here?
-                                WordDerivations {
+                            QueryTerm {
-                                    original: derivations.original,
+                                original: term.original,
                                 zero_typo: None,
                                 is_prefix: false,
                                 prefix_of: Box::new([]),
                                 synonyms: Box::new([]),
                                 split_words: None,
                                 one_typo: Box::new([]),
-                                    two_typos: derivations.two_typos,
+                                two_typos: term.two_typos,
                                 use_prefix_db: None, // false because all items from use_prefix_db have 0 typos
+                                is_ngram: term.is_ngram,
+                                phrase: None,
                             }
                         }
                         _ => panic!(),
                     };
-                        if !new_derivations.is_empty() {
+                    if !new_term.is_empty() {
                         edges.push((
                             nbr_typos as u8 + base_cost,
-                                EdgeCondition::Conditional(conditions_interner.insert(
+                            EdgeCondition::Conditional(conditions_interner.insert(TypoEdge {
-                                    TypoEdge::Word {
+                                term: term_interner.insert(new_term),
-                                        derivations: derivations_interner.insert(new_derivations),
                                 nbr_typos: nbr_typos as u8,
-                                    },
+                            })),
-                                )),
                         ))
                     }
                 }
                 Ok(edges)
             }
-            },
             QueryNode::End => Ok(vec![(0, EdgeCondition::Unconditional)]),
             QueryNode::Deleted | QueryNode::Start => panic!(),
         }

milli/src/search/new/resolve_query_graph.rs

@@ -4,12 +4,12 @@ use std::collections::VecDeque;
 
 use fxhash::FxHashMap;
 use heed::{BytesDecode, RoTxn};
-use roaring::{MultiOps, RoaringBitmap};
+use roaring::RoaringBitmap;
 
 use super::db_cache::DatabaseCache;
 use super::interner::{Interned, Interner};
 use super::query_graph::QUERY_GRAPH_NODE_LENGTH_LIMIT;
-use super::query_term::{Phrase, QueryTerm, WordDerivations};
+use super::query_term::{Phrase, QueryTerm};
 use super::small_bitmap::SmallBitmap;
 use super::{QueryGraph, QueryNode, SearchContext};
 use crate::{CboRoaringBitmapCodec, Index, Result, RoaringBitmapCodec};
@@ -17,7 +17,7 @@ use crate::{CboRoaringBitmapCodec, Index, Result, RoaringBitmapCodec};
 #[derive(Default)]
 pub struct QueryTermDocIdsCache {
     pub phrases: FxHashMap<Interned<Phrase>, RoaringBitmap>,
-    pub derivations: FxHashMap<Interned<WordDerivations>, RoaringBitmap>,
+    pub terms: FxHashMap<Interned<QueryTerm>, RoaringBitmap>,
 }
 impl QueryTermDocIdsCache {
     /// Get the document ids associated with the given phrase
@@ -38,109 +38,53 @@ impl QueryTermDocIdsCache {
         let docids = &self.phrases[&phrase];
         Ok(docids)
     }
-
+    /// Get the document ids associated with the given term
-    /// Get the document ids associated with the given word derivations
+    pub fn get_query_term_docids<'s, 'ctx>(
-    pub fn get_word_derivations_docids<'s, 'ctx>(
         &'s mut self,
         index: &Index,
         txn: &'ctx RoTxn,
         db_cache: &mut DatabaseCache<'ctx>,
         word_interner: &Interner<String>,
-        derivations_interner: &Interner<WordDerivations>,
+        term_interner: &Interner<QueryTerm>,
         phrase_interner: &Interner<Phrase>,
-        derivations: Interned<WordDerivations>,
+        term_interned: Interned<QueryTerm>,
     ) -> Result<&'s RoaringBitmap> {
-        if self.derivations.contains_key(&derivations) {
+        if self.terms.contains_key(&term_interned) {
-            return Ok(&self.derivations[&derivations]);
+            return Ok(&self.terms[&term_interned]);
         };
-        let WordDerivations {
+        let mut docids = RoaringBitmap::new();
-            original: _,
+
-            is_prefix: _,
+        let term = term_interner.get(term_interned);
-            zero_typo,
+        for word in term.all_single_words_except_prefix_db() {
-            prefix_of,
-            synonyms,
-            split_words,
-            one_typo,
-            two_typos,
-            use_prefix_db,
-        } = derivations_interner.get(derivations);
-        let mut or_docids = vec![];
-        for word in zero_typo
-            .iter()
-            .chain(prefix_of.iter())
-            .chain(one_typo.iter())
-            .chain(two_typos.iter())
-            .copied()
-        {
             if let Some(word_docids) = db_cache.get_word_docids(index, txn, word_interner, word)? {
-                or_docids.push(word_docids);
+                docids |=
+                    RoaringBitmapCodec::bytes_decode(word_docids).ok_or(heed::Error::Decoding)?;
             }
         }
-        if let Some(prefix) = use_prefix_db {
+        for phrase in term.all_phrases() {
+            docids |= self.get_phrase_docids(
+                index,
+                txn,
+                db_cache,
+                word_interner,
+                phrase_interner,
+                phrase,
+            )?;
+        }
+
+        if let Some(prefix) = term.use_prefix_db {
             if let Some(prefix_docids) =
-                db_cache.get_word_prefix_docids(index, txn, word_interner, *prefix)?
+                db_cache.get_word_prefix_docids(index, txn, word_interner, prefix)?
             {
-                or_docids.push(prefix_docids);
+                docids |=
+                    RoaringBitmapCodec::bytes_decode(prefix_docids).ok_or(heed::Error::Decoding)?;
             }
         }
-        let mut docids = or_docids
-            .into_iter()
-            .map(|slice| RoaringBitmapCodec::bytes_decode(slice).unwrap())
-            .collect::<Vec<_>>();
-        for synonym in synonyms.iter().copied() {
-            // TODO: cache resolve_phrase?
-            docids.push(resolve_phrase(
-                index,
-                txn,
-                db_cache,
-                word_interner,
-                phrase_interner,
-                synonym,
-            )?);
-        }
-        if let Some(split_words) = split_words {
-            docids.push(resolve_phrase(
-                index,
-                txn,
-                db_cache,
-                word_interner,
-                phrase_interner,
-                *split_words,
-            )?);
-        }
 
-        let docids = MultiOps::union(docids);
+        let _ = self.terms.insert(term_interned, docids);
-        let _ = self.derivations.insert(derivations, docids);
+        let docids = &self.terms[&term_interned];
-        let docids = &self.derivations[&derivations];
         Ok(docids)
     }
-
-    /// Get the document ids associated with the given query term.
-    fn get_query_term_docids<'s, 'ctx>(
-        &'s mut self,
-        index: &Index,
-        txn: &'ctx RoTxn,
-        db_cache: &mut DatabaseCache<'ctx>,
-        word_interner: &Interner<String>,
-        derivations_interner: &Interner<WordDerivations>,
-        phrase_interner: &Interner<Phrase>,
-        term: &QueryTerm,
-    ) -> Result<&'s RoaringBitmap> {
-        match *term {
-            QueryTerm::Phrase { phrase } => {
-                self.get_phrase_docids(index, txn, db_cache, word_interner, phrase_interner, phrase)
-            }
-            QueryTerm::Word { derivations } => self.get_word_derivations_docids(
-                index,
-                txn,
-                db_cache,
-                word_interner,
-                derivations_interner,
-                phrase_interner,
-                derivations,
-            ),
-        }
-    }
 }
 
 pub fn resolve_query_graph<'ctx>(
@@ -154,8 +98,8 @@ pub fn resolve_query_graph<'ctx>(
         db_cache,
         word_interner,
         phrase_interner,
-        derivations_interner,
+        term_interner,
-        query_term_docids,
+        term_docids: query_term_docids,
         ..
     } = ctx;
     // TODO: there is a faster way to compute this big
@@ -183,16 +127,16 @@ pub fn resolve_query_graph<'ctx>(
 
         let node_docids = match n {
             QueryNode::Term(located_term) => {
-                let derivations_docids = query_term_docids.get_query_term_docids(
+                let term_docids = query_term_docids.get_query_term_docids(
                     index,
                     txn,
                     db_cache,
                     word_interner,
-                    derivations_interner,
+                    term_interner,
                     phrase_interner,
-                    &located_term.value,
+                    located_term.value,
                 )?;
-                predecessors_docids & derivations_docids
+                predecessors_docids & term_docids
             }
             QueryNode::Deleted => {
                 panic!()