presto-main/src/main/java/io/prestosql/operator/TopNRowNumberOperator.java/TopNRowNumberOperatorFactory/duplicate
class TopNRowNumberOperatorFactory:        @Override
        public OperatorFactory duplicate()
        {
            return new TopNRowNumberOperatorFactory(operatorId, planNodeId, sourceTypes, outputChannels, partitionChannels, partitionTypes, sortChannels, sortOrder, maxRowCountPerPartition, partial, hashChannel, expectedPositions, joinCompiler);
        }