presto-main/src/main/java/io/prestosql/operator/PartitionedOutputOperator.java/PartitionedOutputOperatorFactory/createOperator
class PartitionedOutputOperatorFactory:        @Override
        public Operator createOperator(DriverContext driverContext)
        {
            OperatorContext operatorContext = driverContext.addOperatorContext(operatorId, planNodeId, PartitionedOutputOperator.class.getSimpleName());
            return new PartitionedOutputOperator(
                    operatorContext,
                    sourceTypes,
                    pagePreprocessor,
                    partitionFunction,
                    partitionChannels,
                    partitionConstants,
                    replicatesAnyRow,
                    nullChannel,
                    outputBuffer,
                    serdeFactory,
                    maxMemory);
        }