cheese8 commented on issue #12460:
URL: 
https://github.com/apache/shardingsphere/issues/12460#issuecomment-938331197


   Scenario Added: 
   We need to clear the plain value on sensitive column after encryption 
finished, so we write sql like
   `update table set plain_column = ''`
   but it was rewrite as 
   `update table set cipher_column='xxx', assisted_column='yyy', 
plain_column=''`
   it was incorrect, we should keep it as original with no rewrite.
   
   AS-IS:
   `update table set plain_column = null` would not be rewrited, but column not 
null allowed on DBA‘s rule.


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