presto-main/src/main/java/io/prestosql/operator/TableWriterOperator.java/TableWriterOperator/mergeWith
class TableWriterOperator:        @Override
        public TableWriterInfo mergeWith(TableWriterInfo other)
        {
            return new TableWriterInfo(
                    Math.max(pageSinkPeakMemoryUsage, other.pageSinkPeakMemoryUsage),
                    new Duration(statisticsWallTime.getValue(NANOSECONDS) + other.statisticsWallTime.getValue(NANOSECONDS), NANOSECONDS).convertToMostSuccinctTimeUnit(),
                    new Duration(statisticsCpuTime.getValue(NANOSECONDS) + other.statisticsCpuTime.getValue(NANOSECONDS), NANOSECONDS).convertToMostSuccinctTimeUnit(),
                    new Duration(validationCpuTime.getValue(NANOSECONDS) + other.validationCpuTime.getValue(NANOSECONDS), NANOSECONDS).convertToMostSuccinctTimeUnit());
        }