2010YOUY01 opened a new issue, #11408:
URL: https://github.com/apache/datafusion/issues/11408

   ### Describe the bug
   
   Table reference in this query is ambiguous, and should be rejected by the 
planner.
   `select t1.v1 from t1 left outer join t1 on true;`
   Now it can be run successfully, see the reproducer:
   (It can also be reproduced if 'left outer join' is changed to 'left join' 
'right join' 'right outer join')
   ```
   > create table t1(v1 int);
   0 row(s) fetched.
   Elapsed 0.068 seconds.
   
   > insert into t1 values (1);
   +-------+
   | count |
   +-------+
   | 1     |
   +-------+
   1 row(s) fetched.
   Elapsed 0.054 seconds.
   
   > select t1.v1 from t1 left outer join t1 on true;
   +----+
   | v1 |
   +----+
   | 1  |
   +----+
   1 row(s) fetched.
   Elapsed 0.016 seconds.
   
   > select v1 from t1 left outer join t1 on true;
   Schema error: Ambiguous reference to unqualified field v1
   ```
   
   ### To Reproduce
   
   _No response_
   
   ### Expected behavior
   
   _No response_
   
   ### Additional context
   
   found by SQLancer https://github.com/apache/datafusion/issues/11030


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