presto-verifier/src/main/java/io/prestosql/verifier/Validator.java/ChangedRow/compareTo
class ChangedRow:        @Override
        public int compareTo(ChangedRow that)
        {
            return ComparisonChain.start()
                    .compare(this.row, that.row, rowComparator(precision))
                    .compareFalseFirst(this.changed == Changed.ADDED, that.changed == Changed.ADDED)
                    .result();
        }