def create_col_list(data):
    """
    Iterates over all data to get the list of columns in the dataset
    :param data:
    :return: set of columns
    """
    columns = set()
    for key,val in data.items():
        try:
            for col in val.keys():
                columns.add(col)
        except Exception as e:
            print(key)
    return columns