caishunfeng commented on pull request #8408:
URL: 
https://github.com/apache/dolphinscheduler/pull/8408#issuecomment-1049477191


   > **But** as @caishunfeng said, it is a dangerous behavior due to we use 
`delete` syntax in DML because it will auto-run when user installs the 
software. Maybe we should add an optioned script about this next time. Or even 
use documents to alert users
   
   Yes, it's a dangerous operation. The user's database structure may be 
modified, which is beyond our control, so I tend to add this optional operation 
in the document or issue, and let the user evaluate whether to delete the data, 
not us.


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