presto-main/src/main/java/io/prestosql/operator/StatisticsWriterOperator.java/StatisticsWriterOperator/StatisticsWriterOperatorFactory
class StatisticsWriterOperator:        public StatisticsWriterOperatorFactory(int operatorId, PlanNodeId planNodeId, StatisticsWriter statisticsWriter, boolean rowCountEnabled, StatisticAggregationsDescriptor<Integer> descriptor)
        {
            this.operatorId = operatorId;
            this.planNodeId = requireNonNull(planNodeId, "planNodeId is null");
            this.statisticsWriter = requireNonNull(statisticsWriter, "statisticsWriter is null");
            this.rowCountEnabled = rowCountEnabled;
            this.descriptor = requireNonNull(descriptor, "descriptor is null");
        }