join query in multiy table

Hi,
```sql
select * from student t1 left join class t2 on t1.sid = t2.sid left join use t3 on t2.id = t3.id
```
can be parsed successed.

```sql
select * from student t1 left join class t2 left join user t3 on t2.id = t3.id on t1.sid = t2.sid
```
will be failed

any idea?

Reproduce both SQL examples in the parser and compare how the nested LEFT JOIN forms are handled. Trace the failing second query through the SQL parsing entry point, then add coverage for both forms and confirm that the previously failing query parses successfully.

Written by the indexing model from the issue text.