Are Selector classes really unable to retrieve parent fields? about fflib-apex-common HOT 3 CLOSED

    public List<Schema.SObjectField> getSObjectFieldList() {
        return new List<Schema.SObjectField> {
            ChildRecord__c.Name,
            ChildRecord__c.Parent__c,
            ChildRecord__c.Parent__r.GranParent__c
        };
}

    public List<Schema.SObjectField> getSObjectFieldList() {
        return new List<Schema.SObjectField> {
            ChildRecord__c.Name,
            ChildRecord__c.Parent__r.Id,
            ChildRecord__c.Parent__r.GranParent__r.Id
        };
    }

    String query = String.format(
        ' SELECT {0},{1}' + 
        ' FROM {2}' +
        ' WHERE Id IN :idSet' +
        ' ORDER BY {3}',
        new List<String>{
            getFieldListString(),
            setInvestSelector.getRelatedFieldListString('Parent__r'),
            getSObjectName(),               
            getOrderBy()                
        }
    );  

public List<Opportunity> selectByIdWithProducts(Set<ID> idSet)
{
    fflib_QueryFactory opportunitiesQueryFactory = newQueryFactory();

    fflib_QueryFactory lineItemsQueryFactory = 
        new OpportunityLineItemsSelector().
            addQueryFactorySubselect(opportunitiesQueryFactory);

    new PricebookEntriesSelector().
        configureQueryFactoryFields(lineItemsQueryFactory, 'PricebookEntry');
    new ProductsSelector().
        configureQueryFactoryFields(lineItemsQueryFactory, 'PricebookEntry.Product2');
    new PricebooksSelector().
        configureQueryFactoryFields(lineItemsQueryFactory, 'PricebookEntry.Pricebook2');

    return (List<Opportunity>) Database.query(
        opportunitiesQueryFactory.setCondition('id in :idSet').toSOQL());
}