presto-main/src/main/java/io/prestosql/sql/planner/planprinter/IoPlanPrinter.java/FormattedDomain/toString
class FormattedDomain:        @Override
        public String toString()
        {
            return toStringHelper(this)
                    .add("nullsAllowed", nullsAllowed)
                    .add("ranges", ranges)
                    .toString();
        }