AGGrid - Aggregation, Filtering - ag-grid

Question

In agGrid, I have an aggregation which is based on two columns. When I apply filter, the aggregates based on two columns are not updated. There is no problem with sum, max, min aggregate functions as all these are based on same column.
here is the steps I follow,
Group by a Column --> Value Aggregation --> Weighted Avg(Custom Aggregation) --> Add a filter.
When I add a filter after weighted avg aggregation calculation, the new weighted avg is not refreshed.
I have this aggregate calculated using a valueGetter function (as in the code below).
Is there a way to update the aggregates which comes from a valueGetter function when I modify the filter?
Thanks in advance.
Regards,
Vijay.
function weightedAverageGetter(params) {
var col = params.column.colId.split('.')[1];
var value = 0;
if (params.data){
value = params.data.qli?params.data.qli[col]:0;
if (col == 'P1prime__c' || col == 'P2Prime__c'){
value = Math.ceil(value);
}
}
var avgW = 0;
if (params.node){
var sumVal = 0;
var sumQty = 0;
for (var node in params.node.allLeafChildren){
var nodeValue = params.node.allLeafChildren[node];
var val = 0;
var qty = 0;
if (nodeValue.data){
val = nodeValue.data.qli?nodeValue.data.qli[col]:0;
qty = nodeValue.data.qli?parseFloat(nodeValue.data.qli.Quantity):0;
}
if (typeof val !=='undefined' && val != '' && typeof qty !=='undefined' && qty != '') {
sumQty += qty;
sumVal += qty*val;
}
}
avgW = sumVal/sumQty;
}
avgW = Math.round(avgW * 100) / 100;
if(!params.column.aggregationActive || Number.isNaN(avgW)){
avgW = '';
}
return params.data?value:avgW;
}