This is my server side controller - 

/**
 * Created by AU0004ZF on 11/21/2019.
 */

global class AccountDashboardController {

    /*public class tableData{

    }*/
    global class tableRow {
        global String segment;
        global Integer sumOfQuantity;
        global Integer asp;
        global Decimal netAmount;
        //public Map<String, AccountDashboardController.tableData> dataMap;
        global tableRow(String seg,Integer quan, Integer asp, Decimal netAmt) {
            this.segment = seg;
            this.sumOfQuantity = quan;
            this.asp = asp;
            this.netAmount = netAmt;
        }
    }

    @AuraEnabled
    global static List<AccountDashboardController.tableRow> getTableData(Id accountId) {
        List<AccountDashboardController.tableRow> tableRows = new List<AccountDashboardController.tableRow>();
        AggregateResult[] groupedResults = [SELECT Segment__c, SUM(Quantity__c) sumQuan,AVG(ASP_Amount_Base_Report__c) avgASP,SUM(Net_Amount_Base_Report__c) sumAmount FROM Sales_Revenue__c WHERE Account__c =: accountId GROUP BY ROLLUP(Segment__c)];
        for (AggregateResult ar : groupedResults)  {
            Decimal quan = (Decimal)ar.get('sumQuan');
            Decimal avgASPDecimal = (Decimal)ar.get('avgASP');
            /*AccountDashboardController.tableRow row = new AccountDashboardController.tableRow();
            row.segment = (String)ar.get('Segment__c');
            Decimal quan = (Decimal)ar.get('sumQuan');
            row.sumOfQuantity = quan.intValue();

            row.asp = avgASPDecimal.intValue();
            row.netAmount = (Decimal) ar.get('sumAmount');
            System.debug('row>>' + row);
            tableRows.add(row);*/
            //System.debug('Average amount' + ar.get('expr0'));
            AccountDashboardController.tableRow row = new AccountDashboardController.tableRow((String)ar.get('Segment__c'),
                    quan.intValue(),
                    avgASPDecimal.intValue(),
                    (Decimal) ar.get('sumAmount'));
            tableRows.add(row);
        }
        System.debug('tableRows>>'+tableRows);
        return tableRows;
    }
}

<!--
 - Created by AU0004ZF on 11/21/2019.
 -->

<aura:component description="AccountDashboard" controller="AccountDashboardController" access="global" extends="c:Base"
                implements="force:appHostable,flexipage:availableForAllPageTypes,force:hasRecordId,force:lightningQuickAction">
    <!-- attributes -->
    <aura:attribute name="data" type="AccountDashboardController.tableRow[]"/>
    <aura:attribute name="columns" type="List"/>

    <!-- handlers-->
    <aura:handler name="init" value="{!this}" action="{!c.doInit}"/>


    <!-- the container element determine the height of the datatable -->
    <div style="height: 300px">
        <lightning:datatable
                keyField="segment"
                data="{!v.data}"
                columns="{!v.columns}"
                hideCheckboxColumn="true"/>
    </div>
</aura:component>

/**
 * Created by AU0004ZF on 11/21/2019.
 */
({
    doInit: function(component, event, helper){

        console.log("accountId>>", component.get("v.recordId"));
        var accountId = component.get("v.recordId");
        /*var recordId = component.get("v.recordId");
        if(recordId.startsWith('001')){
            accountId = recordId;
        }*/

        component.set('v.columns', [
            {label: 'Segments', fieldName: 'segment', type: 'text'},
            {label: 'Quantity', fieldName: 'sumOfQuantity', type: 'number'},
            {label: 'ASP', fieldName: 'asp', type: 'number'},
            {label: 'Net Amount(Base)', fieldName: 'netAmount', type: 'number'}
            ]);
        helper.exec(
            component,
            helper,
            "c.getTableData",
            function(response){

                var state = response.getState();

                if(state === "SUCCESS") {

                    var returnedRows = response.getReturnValue();
                    console.log("returnedRows>>", response.getReturnValue());
                    component.set("v.data",returnedRows);
                }
            },
            {accountId:accountId}
        );
    }
})