Add GroupsResult in ResultUnion

api/src/engine/models/result/common/result-union.model.ts

 import { createUnionType } from '@nestjs/graphql';
+import { GroupsResult } from '../groups-result.model';
 import { RawResult } from '../raw-result.model';
 import { TableResult } from '../table-result.model';
 
 export const ResultUnion = createUnionType({
   name: 'ResultUnion',
-  types: () => [TableResult, RawResult],
+  types: () => [TableResult, RawResult, GroupsResult],
   resolveType(value) {
     if (value.headers) {
       return TableResult;
     }
+
     if (value.listMax) {
       return RawResult;
     }
 
+    if (value.group) {
+      return GroupsResult;
+    }
+
     return null;
   },
 });