presto-main/src/main/java/io/prestosql/operator/SimplePageWithPositionComparator.java/SimplePageWithPositionComparator/SimplePageWithPositionComparator
class SimplePageWithPositionComparator:    public SimplePageWithPositionComparator(List<Type> types, List<Integer> sortChannels, List<SortOrder> sortOrders)
    {
        this.types = ImmutableList.copyOf(requireNonNull(types, "types is null"));
        this.sortChannels = ImmutableList.copyOf(requireNonNull(sortChannels, "sortChannels is null"));
        this.sortOrders = ImmutableList.copyOf(requireNonNull(sortOrders, "sortOrders is null"));
    }