childewuque opened a new issue #2255: May sharding-column supports both  
negative and positive number ?
URL: https://github.com/apache/incubator-shardingsphere/issues/2255
 
 
   If unit_id may be a negative or positive number,when unit_id is a negative 
number,the table name may be l_unit_-1,but our table names are unit_id_0 and 
unit_id_1.
   
   How can we config this case?
   
   ====yaml====
   ....
   `tables:
      l_unit:
          actual-data-nodes: ms.l_unit_$->{0..1}
          key-generator:
               column: id
               type: SNOWFLAKE
         table-strategy:
            inline:
                sharding-column: unit_id
                algorithm-expression: l_unit_$->{unit_id % 2}`

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