caiconghui commented on pull request #5712:
URL: https://github.com/apache/incubator-doris/pull/5712#issuecomment-827551942


   > Isn't it a bit unfriendly to not allow drop table, because the user may 
just want to drop the table due to some abnormality of the table.
   > After the table is dropped, it is reasonable to say that the task of 
schema change should directly fail. Why will it continue to be executed?
   
   if user want to use table again, the table should keep normal when 
recovered, but if schema change job not set table to be normal again, table 
will never be normal agagin.
   In fact, in a stand-alone environment, the table cannot be discarded because 
the table lock is held during the schema change operation. Because we consider 
performance here, the table lock is released part of the time during the entire 
execution of the schema change. Here we only need to cancel the alter table 
operation in time to drop successfully


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