presto-main/src/main/java/io/prestosql/PagesIndexPageSorter.java/PagesIndexPageSorter/PagesIndexPageSorter
class PagesIndexPageSorter:    @Inject
    public PagesIndexPageSorter(PagesIndex.Factory pagesIndexFactory)
    {
        this.pagesIndexFactory = requireNonNull(pagesIndexFactory, "pagesIndexFactory is null");
    }