def if_no_nulls_in(result, offset, how_many=1):
    """
    Check if null not exist from offset until offset+how_many
    :param result: aggregation result
    :param offset: current offset
    :param how_many: check number
    :return: true if not exist, else false
    """
    for index in range(offset, offset + how_many):
        if result[index] is None:
            return False
    return True