def find_header_line(data, header_keys):
    """
    Find the header line in row_based data_structure
    NOT IMPLEMENTED YET: Version 0.9 feature

    Parameters
    ----------
    data : list, pandas.DataFrame
    header_keys : str, list, set
        some key(s) to find in a row

    Returns
    -------
    int
        the header_line
    """
    raise NotImplemented
