presto-main/src/main/java/io/prestosql/operator/PagesIndexOrdering.java/PagesIndexOrdering/vectorSwap
class PagesIndexOrdering:    private static void vectorSwap(PagesIndex pagesIndex, int from, int l, int s)
    {
        for (int i = 0; i < s; i++, from++, l++) {
            pagesIndex.swap(from, l);
        }
    }