presto-main/src/main/java/io/prestosql/operator/GroupByIdBlock.java/GroupByIdBlock/compareTo
class GroupByIdBlock:    @Override
    public int compareTo(int leftPosition, int leftOffset, int leftLength, Block rightBlock, int rightPosition, int rightOffset, int rightLength)
    {
        return block.compareTo(leftPosition, leftOffset, leftLength, rightBlock, rightPosition, rightOffset, rightLength);
    }