def _get_table_rows(parent_table, table_name, row_name):
        """
        Inconsistent behavior:
        {'TABLE_intf': [{'ROW_intf': {
        vs
        {'TABLE_mac_address': {'ROW_mac_address': [{
        vs
        {'TABLE_vrf': {'ROW_vrf': {'TABLE_adj': {'ROW_adj': {
        """
        if parent_table is None:
            return []
        _table = parent_table.get(table_name)
        _table_rows = []
        if isinstance(_table, list):
            _table_rows = [_table_row.get(row_name) for _table_row in _table]
        elif isinstance(_table, dict):
            _table_rows = _table.get(row_name)
        if not isinstance(_table_rows, list):
            _table_rows = [_table_rows]
        return _table_rows