Generates the sql for this query window and returns the sql as a string.

        :type debug: bool
        :param debug: If True, the sql will be returned in a format that is easier to read and debug.
            Defaults to False

        :type use_cache: bool
        :param use_cache: If True, the query will returned the cached sql if it exists rather
            then generating the sql again. If False, the sql will be generated again. Defaults to True.

        :rtype: str
        :return: The generated sql for this query window

def get_sql(self, debug=False, use_cache=True):
        """
        Generates the sql for this query window and returns the sql as a string.

        :type debug: bool
        :param debug: If True, the sql will be returned in a format that is easier to read and debug.
            Defaults to False

        :type use_cache: bool
        :param use_cache: If True, the query will returned the cached sql if it exists rather
            then generating the sql again. If False, the sql will be generated again. Defaults to True.

        :rtype: str
        :return: The generated sql for this query window
        """
        # TODO: implement caching and debug
        sql = ''
        sql += self.build_partition_by_fields()
        sql += self.build_order_by(use_alias=False)
        sql += self.build_limit()
        sql = sql.strip()
        sql = 'OVER ({0})'.format(sql)
        self.sql = sql

        return self.sql