presto-main/src/main/java/io/prestosql/operator/PartitionedOutputOperator.java/PartitionedOutputOperatorFactory/duplicate
class PartitionedOutputOperatorFactory:        @Override
        public OperatorFactory duplicate()
        {
            return new PartitionedOutputOperatorFactory(
                    operatorId,
                    planNodeId,
                    sourceTypes,
                    pagePreprocessor,
                    partitionFunction,
                    partitionChannels,
                    partitionConstants,
                    replicatesAnyRow,
                    nullChannel,
                    outputBuffer,
                    serdeFactory,
                    maxMemory);
        }