code: def get_left_table(self):
          
          if self.left_table:
              return self.left_table
          if len(self.owner.tables):
              return self.owner.tables[0]
docs: Returns the left table if one was specified, otherwise the first
          table in the query is returned
  
          :rtype: :class:`Table <querybuilder.tables.Table>`
          :return: the left table if one was specified, otherwise the first table in the query