<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def get_left_table(self):
 """ 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 """

        if self.left_table:
            return self.left_table
        if len(self.owner.tables):
            return self.owner.tables[0]