From 43989fe2e4977736ec3685c6516f86b172298479 Mon Sep 17 00:00:00 2001
From: ManyTheFish <many@meilisearch.com>
Date: Tue, 3 Oct 2023 12:02:16 +0200
Subject: [PATCH] Reduce porximity range from 7 to 3

---
 milli/src/proximity.rs                                     | 2 +-
 milli/src/search/new/ranking_rule_graph/proximity/build.rs | 5 +++--
 2 files changed, 4 insertions(+), 3 deletions(-)

diff --git a/milli/src/proximity.rs b/milli/src/proximity.rs
index 62f490119..8261015a3 100644
--- a/milli/src/proximity.rs
+++ b/milli/src/proximity.rs
@@ -2,7 +2,7 @@ use std::cmp;
 
 use crate::{relative_from_absolute_position, Position};
 
-pub const MAX_DISTANCE: u32 = 8;
+pub const MAX_DISTANCE: u32 = 4;
 
 pub fn index_proximity(lhs: u32, rhs: u32) -> u32 {
     if lhs <= rhs {
diff --git a/milli/src/search/new/ranking_rule_graph/proximity/build.rs b/milli/src/search/new/ranking_rule_graph/proximity/build.rs
index a5c0b07cb..d9d1a77ae 100644
--- a/milli/src/search/new/ranking_rule_graph/proximity/build.rs
+++ b/milli/src/search/new/ranking_rule_graph/proximity/build.rs
@@ -1,6 +1,7 @@
 #![allow(clippy::too_many_arguments)]
 
 use super::ProximityCondition;
+use crate::proximity::MAX_DISTANCE;
 use crate::search::new::interner::{DedupInterner, Interned};
 use crate::search::new::query_term::LocatedQueryTermSubset;
 use crate::search::new::SearchContext;
@@ -35,7 +36,7 @@ pub fn build_edges(
     }
 
     let mut conditions = vec![];
-    for cost in right_ngram_max..(7 + right_ngram_max) {
+    for cost in right_ngram_max..(((MAX_DISTANCE as usize) - 1) + right_ngram_max) {
         conditions.push((
             cost as u32,
             conditions_interner.insert(ProximityCondition::Uninit {
@@ -47,7 +48,7 @@ pub fn build_edges(
     }
 
     conditions.push((
-        (7 + right_ngram_max) as u32,
+        ((MAX_DISTANCE - 1) + (right_ngram_max as u32)),
         conditions_interner.insert(ProximityCondition::Term { term: right_term.clone() }),
     ));