code: def db_get_map(self, table, record, column):
          
          val = self.db_get_val(table, record, column)
          assert isinstance(val, dict)
          return val
docs: Gets dict type value of 'column' in 'record' in 'table'.
  
          This method is corresponding to the following ovs-vsctl command::
  
              $ ovs-vsctl get TBL REC COL