Describe the bug
net.sf.jsqlparser.parser.ParseException: Encountered unexpected token: "IF" "IF"

To Reproduce
Steps to reproduce the behavior:

1. Example SQL
   `SELECT
   count(0)
   FROM
   (
   SELECT
   t1., t2., p.project_name projectName,
   g.group_name groupName,
   t2.zone_id zoneId,
   t2.project_id projectId,
   t2.group_id groupId,
   t2.student_id studentId,
   t2.team_id teamId
   FROM
   (
   SELECT

    		IF (
    			@last_project_id = r.project_id
    			AND @last_group_id = r.group_id ,@rank_global :=@rank_global + 1 ,@rank_global := 1
    		) rankGlobal,
    		r.student_project_id rid ,@last_project_id := r.project_id tmp_p_id1,
    		@last_group_id := r.group_id tmp_g_id1
    	FROM
    		(
    			SELECT
    				@rank_global := 0,
    				@last_project_id := NULL ,@last_group_id := NULL
    		) v,
    		(
    			SELECT
    				r.*, SUM(r.score) totalScore,
    				sp.student_no studentNo,
    				GROUP_CONCAT(r.score ORDER BY r.round) scores,
    				CONCAT(
    					r.event_id,
    					'-',
    					r.student_id,
    					'-',
    					r.project_id,
    					'-',
    					r.group_id
    				) student_project_id
    			FROM
    				result r
    			INNER JOIN student_project sp ON (
    				sp.event_id = r.event_id
    				AND sp.student_id = r.student_id
    				AND sp.zone_id = r.zone_id
    			)
    			INNER JOIN student s ON s.id = sp.student_id
    			INNER JOIN project p ON p.id = r.project_id
    			WHERE
    				r.event_id = 12
    			GROUP BY
    				r.project_id,
    				r.group_id,
    				r.student_id,
    				r.event_id
    			ORDER BY
    				r.project_id,
    				r.group_id,
    				CASE
    			WHEN p.score_sort = 1 THEN
    				SUM(r.score)
    			END DESC,
    			CASE
    		WHEN p.score_sort = 0 THEN
    			SUM(r.score)
    		END,
    		s.birthday DESC
    		) r
    	) t1
    INNER JOIN (
    	SELECT
   
    	IF (
    		@last_zone_id = r.zone_id
    		AND @last_project_id = r.project_id
    		AND @last_group_id = r.group_id ,@rank_zone :=@rank_zone + 1 ,@rank_zone := 1
    	) rankZone,
    	r.*, @last_zone_id := r.zone_id tmp_zone_id ,@last_project_id := r.project_id tmp_p_id2,
    	@last_group_id := r.group_id tmp_g_id2
    FROM
    	(
    		SELECT
    			@rank_zone := 0,
    			@last_zone_id := NULL,
    			@last_project_id := NULL ,@last_group_id := NULL
    	) v,
    	(
    		SELECT
    			r.*, SUM(r.score) totalScore,
    			sp.student_no studentNo,
    			GROUP_CONCAT(r.score ORDER BY r.round) scores,
    			z.zone_name zoneName,
    			s.team_id,
    			t.team_name teamName,
    			s.full_name fullName,
    			s.identity_no identityNo,
    			CONCAT(
    				r.event_id,
    				'-',
    				r.student_id,
    				'-',
    				r.project_id,
    				'-',
    				r.group_id
    			) student_project_id
    		FROM
    			result r
    		INNER JOIN student_project sp ON (
    			sp.event_id = r.event_id
    			AND sp.student_id = r.student_id
    			AND sp.zone_id = r.zone_id
    		)
    		INNER JOIN student s ON s.id = sp.student_id
    		INNER JOIN `zone` z ON z.id = r.zone_id
    		INNER JOIN team t ON t.id = s.team_id
    		INNER JOIN project p ON p.id = r.project_id
    		WHERE
    			r.event_id = 12
    		GROUP BY
    			r.project_id,
    			r.group_id,
    			r.student_id,
    			r.event_id
    		ORDER BY
    			r.project_id,
    			r.group_id,
    			r.zone_id,
    			CASE
    		WHEN p.score_sort = 1 THEN
    			SUM(r.score)
    		END DESC,
    		CASE
    	WHEN p.score_sort = 0 THEN
    		SUM(r.score)
    	END,
    	s.birthday DESC
    	) r
    ) t2 ON t2.student_project_id = t1.rid
    INNER JOIN project p ON p.id = t2.project_id
    INNER JOIN oe_group g ON g.id = t2.group_id
    WHERE
    	1 = 1
    AND team_id = 12
    ORDER BY
    	project_id,
    	group_id,
    	rankGlobal,
    	rankZone
   

   ) tmp_count`

2. Parsing this SQL using JSqlParser with this statements
   Statement statement = CCJSqlParserUtil.parse(sql); TablesNamesFinder tablesNamesFinder = new TablesNamesFinder(); List<String> tableList = tablesNamesFinder.getTableList(statement); System.out.println(tableList.toString());

3. Exception
   net.sf.jsqlparser.parser.ParseException: Encountered unexpected token: "IF" "IF"
   Expected behavior

[result, student_project, student, project, zone, team, oe_group]

System

• Database Mysql8.0.18
• Java Version 1.8
• JSqlParser version 3.1