code: def set_left_table(self, left_table=None):
          
          if left_table:
              self.left_table = TableFactory(
                  table=left_table,
                  owner=self.owner,
              )
          else:
              self.left_table = self.get_left_table()
docs: Sets the left table for this join clause. If no table is specified, the first table
          in the query will be used
  
          :type left_table: str or dict or :class:`Table <querybuilder.tables.Table>` or None
          :param left_table: The left table being joined with. This can be a string of the table
              name, a dict of {'alias': table}, or a ``Table`` instance. Defaults to the first table
              in the query.