From 6da54d0cb6648fdceb32b924064fcd94c1b448e7 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Cl=C3=A9ment=20Renault?= <clement@meilisearch.com>
Date: Thu, 9 Mar 2023 14:56:13 +0100
Subject: [PATCH 1/2] Add a test to fix a diacritic issue

---
 meilisearch/tests/search/mod.rs | 25 +++++++++++++++++++++++++
 1 file changed, 25 insertions(+)

diff --git a/meilisearch/tests/search/mod.rs b/meilisearch/tests/search/mod.rs
index 9a51be676..1e5c23a71 100644
--- a/meilisearch/tests/search/mod.rs
+++ b/meilisearch/tests/search/mod.rs
@@ -192,6 +192,31 @@ async fn test_kanji_language_detection() {
         .await;
 }
 
+#[cfg(feature = "default")]
+#[actix_rt::test]
+async fn test_thai_language() {
+    let server = Server::new().await;
+    let index = server.index("test");
+
+    // We don't need documents, the issue is on the query side only.
+    let documents = json!([
+        { "id": 0, "title": "สบู่สมุนไพรดอกดาวเรือง 100 กรัม จำนวน 6 ก้อน" },
+        { "id": 1, "title": "สบู่สมุนไพรชาเขียว 100 กรัม จำนวน 6 ก้อน" },
+        { "id": 2, "title": "สบู่สมุนไพรฝางแดงผสมว่านหางจรเข้ 100 กรัม จำนวน 6 ก้อน" }
+    ]);
+    index.add_documents(documents, None).await;
+    index.wait_task(0).await;
+
+    index.update_settings(json!({"rankingRules": ["exactness"]})).await;
+    index.wait_task(1).await;
+
+    index
+        .search(json!({"q": "สบู"}), |response, code| {
+            assert_eq!(code, 200, "{}", response);
+        })
+        .await;
+}
+
 #[actix_rt::test]
 async fn search_multiple_params() {
     let server = Server::new().await;

From 175e8a84959f79d9ac38a941610edaa8fb3ee795 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Cl=C3=A9ment=20Renault?= <clement@meilisearch.com>
Date: Thu, 9 Mar 2023 14:57:30 +0100
Subject: [PATCH 2/2] Fix a diacritic issue

---
 milli/src/search/query_tree.rs | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/milli/src/search/query_tree.rs b/milli/src/search/query_tree.rs
index 541dd8f7a..50f16c2d9 100755
--- a/milli/src/search/query_tree.rs
+++ b/milli/src/search/query_tree.rs
@@ -792,6 +792,10 @@ where
 
     let mut peekable = query.peekable();
     while let Some(token) = peekable.next() {
+        if token.lemma().is_empty() {
+            continue;
+        }
+
         // early return if word limit is exceeded
         if primitive_query.len() >= parts_limit {
             return primitive_query;