presto-main/src/main/java/io/prestosql/sql/planner/planprinter/IoPlanPrinter.java/FormattedMarker/equals
class FormattedMarker:        @Override
        public boolean equals(Object obj)
        {
            if (this == obj) {
                return true;
            }
            if (obj == null || getClass() != obj.getClass()) {
                return false;
            }
            FormattedMarker o = (FormattedMarker) obj;
            return Objects.equals(value, o.value) &&
                    Objects.equals(bound, o.bound);
        }