[O] Optimize query

src/main/java/icu/samnyan/aqua/api/controller/sega/game/maimai2/Maimai2New.kt

@@ -58,8 +58,7 @@ class Maimai2New(
         return mapOf(
             "name" to user,
             "plays" to plays.size,
-            "serverRank" to userDataRepository.findPlayerRatingByOrderByPlayerRating()
+            "serverRank" to userDataRepository.getRanking(user.playerRating),
-                .binarySearch(user.playerRating) + 1,
             "accuracy" to plays.sumOf { it.achievement } / plays.size,
             "rating" to user.playerRating,
             "ratingHighest" to user.highestRating,

src/main/java/icu/samnyan/aqua/sega/maimai2/dao/userdata/UserDataRepository.java

@@ -3,6 +3,7 @@ package icu.samnyan.aqua.sega.maimai2.dao.userdata;
 import icu.samnyan.aqua.sega.general.model.Card;
 import icu.samnyan.aqua.sega.maimai2.model.userdata.UserDetail;
 import org.springframework.data.jpa.repository.JpaRepository;
+import org.springframework.data.jpa.repository.Query;
 import org.springframework.stereotype.Repository;
 import org.springframework.transaction.annotation.Transactional;
 
@@ -22,5 +23,6 @@ public interface UserDataRepository extends JpaRepository<UserDetail, Long> {
     @Transactional
     void deleteByCard(Card card);
 
-    List<Integer> findPlayerRatingByOrderByPlayerRating();
+    @Query("select count(*) from Maimai2UserData where playerRating > :rating")
+    Integer getRanking(int rating);
 }

src/main/resources/db/migration/mariadb/V251_1__maimai2_index.sql

@@ -0,0 +1 @@
+CREATE INDEX idx_player_rating ON maimai2_user_detail(player_rating);

src/main/resources/db/migration/mysql/V251_1__maimai2_index.sql

@@ -0,0 +1 @@
+CREATE INDEX idx_player_rating ON maimai2_user_detail(player_rating);

src/main/resources/db/migration/sqlite/V251_1__maimai2_index.sql

@@ -0,0 +1 @@
+CREATE INDEX idx_player_rating ON maimai2_user_detail(player_rating);