def aggregate_options_map(options_map, src_options_map):
    """Aggregate some of the attributes of options map.

    Args:
      options_map: The target map in which we want to aggregate attributes.
        Note: This value is mutated in-place.
      src_options_map: A source map whose values we'd like to see aggregated.
    """
    op_currencies = options_map['operating_currency']
    for currency in src_options_map['operating_currency']:
        if currency not in op_currencies:
            op_currencies.append(currency)
    commodities = options_map['commodities']
    for currency in src_options_map['commodities']:
        commodities.add(currency)
