chore(*): fix adv filtering check and set selected field pipeArgs

Author: igdmdimitrov

projects/igniteui-angular/src/lib/query-builder/query-builder-tree.component.ts

@@ -516,7 +516,8 @@ export class IgxQueryBuilderTreeComponent implements AfterViewInit, OnDestroy {
 
     /** @hidden */
     protected isAdvancedFiltering(): boolean {
-        return this.entities?.length === 1 && !this.entities[0]?.name;
+        return (this.entities?.length === 1 && !this.entities[0]?.name) ||
+            this.entities.find(e => e.childEntities?.length > 0) !== undefined;
     }
 
     /** @hidden */
@@ -701,6 +702,10 @@ export class IgxQueryBuilderTreeComponent implements AfterViewInit, OnDestroy {
             this._selectedField.filters = this.getFilters(this._selectedField);
         }
 
+        if (this._selectedField && this._selectedField.pipeArgs) {
+            this._selectedField.pipeArgs = this.getPipeArgs(this._selectedField);
+        }
+
         return this._selectedField;
     }