presto-main/src/main/java/io/prestosql/sql/planner/planprinter/IoPlanPrinter.java/EstimatedStatsAndCost/toString
class EstimatedStatsAndCost:        @Override
        public String toString()
        {
            return toStringHelper(this)
                    .add("outputRowCount", outputRowCount)
                    .add("outputSizeInBytes", outputSizeInBytes)
                    .add("cpuCost", cpuCost)
                    .add("maxMemory", maxMemory)
                    .add("networkCost", networkCost)
                    .toString();
        }