morrySnow opened a new pull request, #38729:
URL: https://github.com/apache/doris/pull/38729

   pick from master #38660
   
   insert will hold readlock of target table before planning. if nereids need 
db readlock after it, will lead to dead lock. because other statement need to 
hold db lock before get table lock
   
   for example:
   
   insert: target table read lock -> database read lock
   drop table: database write lock -> target table write lock
   


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