presto-main/src/main/java/io/prestosql/operator/HashSemiJoinOperator.java/HashSemiJoinOperatorFactory/duplicate
class HashSemiJoinOperatorFactory:        @Override
        public OperatorFactory duplicate()
        {
            return new HashSemiJoinOperatorFactory(operatorId, planNodeId, setSupplier, probeTypes, probeJoinChannel, probeJoinHashChannel);
        }