tuichenchuxin commented on issue #13670:
URL: 
https://github.com/apache/shardingsphere/issues/13670#issuecomment-979829295


   @ThisOnly I think we should not add negtive value on column with 
auto-increment. But it has really inserted, return error is not correct.
   
   `There can be only one AUTO_INCREMENT column per table, it must be indexed, 
and it cannot have a DEFAULT value. An AUTO_INCREMENT column works properly 
only if it contains only positive values. Inserting a negative number is 
regarded as inserting a very large positive number. This is done to avoid 
precision problems when numbers “wrap” over from positive to negative and also 
to ensure that you do not accidentally get an AUTO_INCREMENT column that 
contains 0.`
   https://dev.mysql.com/doc/refman/8.0/en/create-table.html


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