A constructor that takes a :py:class:`BQTable`.

           :param table:
           :type table: BQTable

def from_bqtable(cls, table, client=None):
        """A constructor that takes a :py:class:`BQTable`.

           :param table:
           :type table: BQTable
        """
        return cls(table.project_id, table.dataset_id, table.table_id, client=client)