Feature: add support straight join in mysql

src/Illuminate/Database/Query/Builder.php

@@ -776,6 +776,49 @@ public function crossJoinSub($query, $as)
         return $this;
     }
 
+    /**
+     * Add a straight join to the query.
+     *
+     * @param  \Illuminate\Contracts\Database\Query\Expression|string  $table
+     * @param  \Closure|string  $first
+     * @param  string|null  $operator
+     * @param  \Illuminate\Contracts\Database\Query\Expression|string|null  $second
+     * @return $this
+     */
+    public function straightJoin($table, $first, $operator = null, $second = null)
+    {
+        return $this->join($table, $first, $operator, $second, 'straight_join');
+    }
+
+    /**
+     * Add a "straight join where" clause to the query.
+     *
+     * @param  \Illuminate\Contracts\Database\Query\Expression|string  $table
+     * @param  \Closure|\Illuminate\Contracts\Database\Query\Expression|string  $first
+     * @param  string  $operator
+     * @param  \Illuminate\Contracts\Database\Query\Expression|string  $second
+     * @return $this
+     */
+    public function straightJoinWhere($table, $first, $operator, $second)
+    {
+        return $this->joinWhere($table, $first, $operator, $second, 'straight_join');
+    }
+
+    /**
+     * Add a subquery straight join to the query.
+     *
+     * @param  \Closure|\Illuminate\Database\Query\Builder|\Illuminate\Database\Eloquent\Builder<*>|string  $query
+     * @param  string  $as
+     * @param  \Closure|\Illuminate\Contracts\Database\Query\Expression|string  $first
+     * @param  string|null  $operator
+     * @param  \Illuminate\Contracts\Database\Query\Expression|string|null  $second
+     * @return $this
+     */
+    public function straightJoinSub($query, $as, $first, $operator = null, $second = null)
+    {
+        return $this->joinSub($query, $as, $first, $operator, $second, 'straight_join');
+    }
+
     /**
      * Get a new join clause.
      *

src/Illuminate/Database/Query/Grammars/Grammar.php

@@ -199,7 +199,9 @@ protected function compileJoins(Builder $query, $joins)
                 return $this->compileJoinLateral($join, $tableAndNestedJoins);
             }
 
-            return trim("{$join->type} join {$tableAndNestedJoins} {$this->compileWheres($join)}");
+            $joinWord = ($join->type === 'straight_join' && $this->supportsStraightJoins()) ? '' : ' join';
+
+            return trim("{$join->type}{$joinWord} {$tableAndNestedJoins} {$this->compileWheres($join)}");
         })->implode(' ');
     }
 
@@ -217,6 +219,16 @@ public function compileJoinLateral(JoinLateralClause $join, string $expression):
         throw new RuntimeException('This database engine does not support lateral joins.');
     }
 
+    /**
+     * Determine if the grammar supports straight joins.
+     *
+     * @return bool
+     */
+    protected function supportsStraightJoins()
+    {
+        throw new RuntimeException('This database engine does not support straight joins.');
+    }
+
     /**
      * Compile the "where" portions of the query.
      *

src/Illuminate/Database/Query/Grammars/MySqlGrammar.php

@@ -387,6 +387,14 @@ public function compileJoinLateral(JoinLateralClause $join, string $expression):
         return trim("{$join->type} join lateral {$expression} on true");
     }
 
+    /**
+     * {@inheritdoc}
+     */
+    protected function supportsStraightJoins()
+    {
+        return true;
+    }
+
     /**
      * Prepare a JSON column being updated using the JSON_SET function.
      *

tests/Database/DatabaseQueryBuilderTest.php

@@ -3299,6 +3299,53 @@ public function testRightJoinSub()
         $builder->from('users')->rightJoinSub(['foo'], 'sub', 'users.id', '=', 'sub.id');
     }
 
+    public function testStraightJoin()
+    {
+        $builder = $this->getMySqlBuilder();
+        $builder->getConnection()->shouldReceive('getDatabaseName');
+        $builder->select('*')->from('users')->straightJoin('contacts', 'users.id', 'contacts.id');
+        $this->assertSame('select * from `users` straight_join `contacts` on `users`.`id` = `contacts`.`id`', $builder->toSql());
+
+        $builder = $this->getMySqlBuilder();
+        $builder->getConnection()->shouldReceive('getDatabaseName');
+        $builder->select('*')->from('users')->join('contacts', 'users.id', '=', 'contacts.id')->straightJoin('photos', 'users.id', '=', 'photos.id');
+        $this->assertSame('select * from `users` inner join `contacts` on `users`.`id` = `contacts`.`id` straight_join `photos` on `users`.`id` = `photos`.`id`', $builder->toSql());
+
+        $builder = $this->getMySqlBuilder();
+        $builder->getConnection()->shouldReceive('getDatabaseName');
+        $builder->select('*')->from('users')->straightJoinWhere('photos', 'users.id', '=', 'bar')->joinWhere('photos', 'users.id', '=', 'foo');
+        $this->assertSame('select * from `users` straight_join `photos` on `users`.`id` = ? inner join `photos` on `users`.`id` = ?', $builder->toSql());
+        $this->assertEquals(['bar', 'foo'], $builder->getBindings());
+    }
+
+    public function testStraightJoinNoSupport()
+    {
+        $this->expectException(RuntimeException::class);
+        $builder = $this->getBuilder();
+        $builder->select('*')->from('users')->straightJoin('contacts', 'users.id', 'contacts.id');
+        $builder->toSql();
+    }
+
+    public function testStraightJoinSub()
+    {
+        $builder = $this->getMySqlBuilder();
+        $builder->getConnection()->shouldReceive('getDatabaseName');
+        $builder->from('users')->straightJoinSub($this->getBuilder()->from('contacts'), 'sub', 'users.id', '=', 'sub.id');
+        $this->assertSame('select * from `users` straight_join (select * from "contacts") as `sub` on `users`.`id` = `sub`.`id`', $builder->toSql());
+
+        $this->expectException(InvalidArgumentException::class);
+        $builder = $this->getBuilder();
+        $builder->from('users')->straightJoinSub(['foo'], 'sub', 'users.id', '=', 'sub.id');
+    }
+
+    public function testStraightJoinSubNoSupport()
+    {
+        $this->expectException(RuntimeException::class);
+        $builder = $this->getBuilder();
+        $builder->from('users')->straightJoinSub($this->getBuilder()->from('contacts'), 'sub', 'users.id', '=', 'sub.id');
+        $builder->toSql();
+    }
+
     public function testJoinLateral()
     {
         $builder = $this->getMySqlBuilder();