presto-array/src/main/java/io/prestosql/array/IntBigArrays.java/IntBigArrays/vecSwap
class IntBigArrays:    private static void vecSwap(final int[][] x, long a, long b, final long n)
    {
        for (int i = 0; i < n; i++, a++, b++) {
            swap(x, a, b);
        }
    }