EmmyMiao87 commented on issue #8191:
URL: 
https://github.com/apache/incubator-doris/issues/8191#issuecomment-1050662479


   At present, it is found that if the cte of the last layer of query is 
directly taken out, the problem of this null pointer can be solved.
   For example,
   ```
   with cte as (xxx)
   select * from cte;
   ```
   The declaration of this CTE is completely unnecessary and can be changed 
directly to
   ```
   select * from xxx;
   ```
   You can avoid this problem.


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