Corrected schema used for MySQL

framework/yii/db/mysql/QueryBuilder.php

@@ -9,7 +9,7 @@ namespace yii\db\mysql;
 
 use yii\db\Exception;
 use yii\base\InvalidParamException;
-use yii\db\sqlite\Schema;
+use yii\db\mysql\Schema;
 
 /**
  * QueryBuilder is the query builder for MySQL databases.