presto-main/src/main/java/io/prestosql/operator/LookupJoinOperatorFactory.java/LookupJoinOperatorFactory/createOperator
class LookupJoinOperatorFactory:    @Override
    public Operator createOperator(DriverContext driverContext)
    {
        checkState(!closed, "Factory is already closed");
        OperatorContext operatorContext = driverContext.addOperatorContext(operatorId, planNodeId, getOperatorType());
        return new WorkProcessorOperatorAdapter(operatorContext, this);
    }