def getColumnList(columnlistfile):
    """
    Method to read back the column list,
    extracted with sddsextractcolumnnames.

    Parameters:
    -----------
    columnlistfild: str
        Filename of the file where the column list is
        stored.

    Returns:
    --------
    columnlist: List[str]
        List of the column names.
    """
    with open(columnlistfile, "r") as f:
        lines = f.read().splitlines()

    return [line for line in lines]