//Component
<aura:component controller="DispalyPotentialBuyersController" implements="force:appHostable,flexipage:availableForAllPageTypes,flexipage:availableForRecordHome,force:hasRecordId,forceCommunity:availableForAllPageTypes,force:lightningQuickAction" access="global" >
    <aura:attribute name="recordId" type="String" />
    <aura:handler name="init" value="{!this}" action="{!c.doInit}" />
    <aura:attribute name="listOfBuyers" type="LIST"/>
    <div>
        <div>
            <table class="slds-table slds-table_bordered slds-table_cell-buffer">
                <thead>
                    <tr class="slds-text-title_caps">
                        <th scope="col">
                            <div class="slds-truncate" title="Opportunity Name">Field 1</div>
                        </th>
                        <th scope="col">
                            <div class="slds-truncate" title="Account Name">Field 2</div>
                        </th>
                    </tr>
                </thead>
                <tbody>
                    <aura:iteration items="{!v.listOfBuyers}" var="lob">
                        <tr>
                            <td data-label="Name">
                                <div class="slds-truncate" title="{!lob.Subject}">{!lob.Subject}</div>
                            </td>
                            <td data-label="Name">
                                <div class="slds-truncate" title="{!lob.Subject}">{!lob.Subject}</div>
                            </td>
                        </tr>
                    </aura:iteration>
                </tbody>
            </table>
        </div>
    </div>
</aura:component>

//Controller

({
	doInit : function(component, event, helper) {
        helper.getData(component);
	}
})

//Helper
({
    getData : function(component) {
        var action = component.get("c.fetchRecords");
        var id = component.get("v.recordId");
        action.setParams({
            "recordIds": id
        });
        action.setCallback(this, function(response) {
            var state = response.getState();
            if (component.isValid() && state === 'SUCCESS') {
                var result = response.getReturnValue();
                component.set('v.listOfBuyers',result);
            } else if (component.isValid() && state === 'ERROR') {
                var errors = response.getError();
                if (errors) {
                    if (errors[0] && errors[0].message) {
                        console.log('Error message: ' + errors[0].message);
                    }
                } else {
                    console.log('Unknown error');
                }
            }
            
        });
        
        $A.enqueueAction(action);
    }
})

//Renderer
public class DispalyPotentialBuyersController {

    @auraEnabled
    public static list<sObject> fetchRecords(String recordIds){
        list<sObject> lstRecordList = new list<sObject>();
        set<Id> setAccount = new set<id>();
        String soql = prepareQueryStr('Account');// Object Name Of Accounts/Contact Related List
        soql += ' Where hemant1993__Opportunity__c =: recordIds';// Replace hemant1993__Opportunity__c Field with Opportunity Reference Field
        for(Account oAccoout : database.query(prepareQueryStr('Account'))){// Object Name Of Accounts/Contact Related List
            setAccount.add(oAccoout.Id);
        }
        soql = prepareQueryStr('Case'); // Object Name Of  Preference
        soql +=  ' Where AccountId IN : setAccount'; //ReplaceAccountId Field with Preference Reference Field
        for(Case oCase : database.query(soql)){
            lstRecordList.add(oCase);
        }
        return lstRecordList;
    }
    
//Not Sure?
    public static String prepareQueryStr(String objName) {
        Map<String , Schema.SObjectType> globalDescription = Schema.getGlobalDescribe();
        Schema.sObjectType objType = globalDescription.get(objName);
        Schema.DescribeSObjectResult r1 = objType.getDescribe(); 
        Map<String , Schema.SObjectField> mapFieldList = r1.fields.getMap();  
        
        String queryStr = 'SELECT ';
        for(Schema.SObjectField field : mapFieldList.values()){  
            Schema.DescribeFieldResult fieldResult = field.getDescribe(); 
            if(fieldResult.isAccessible()){
                if(fieldResult.getName() != 'Id' && fieldResult.getName() != 'id' && fieldResult.getName() != 'ID'){ 
                    queryStr += fieldResult.getName() + ', ';
                }
            }  
        }
        
        queryStr += ' Id FROM ' + objName + ' ';
        return queryStr;
    }
}