chore(*): move createColumn methods from hierarchical to base directive

Author: mddragnev

projects/igniteui-angular/src/lib/grids/hierarchical-grid/hierarchical-grid-base.directive.ts

@@ -232,51 +232,6 @@ export abstract class IgxHierarchicalGridBaseDirective extends IgxGridBaseDirect
         });
     }
 
-    protected _createColumn(col) {
-        let ref;
-        if (col instanceof IgxColumnGroupComponent) {
-            ref = this._createColGroupComponent(col);
-        } else {
-            ref = this._createColComponent(col);
-        }
-        return ref;
-    }
-
-    protected _createColGroupComponent(col: IgxColumnGroupComponent) {
-        const factoryGroup = this.resolver.resolveComponentFactory(IgxColumnGroupComponent);
-        const ref = this.viewRef.createComponent(IgxColumnGroupComponent, { injector: this.viewRef.injector });
-        ref.changeDetectorRef.detectChanges();
-        factoryGroup.inputs.forEach((input) => {
-            const propName = input.propName;
-            ref.instance[propName] = col[propName];
-        });
-        if (col.children.length > 0) {
-            const newChildren = [];
-            col.children.forEach(child => {
-                const newCol = this._createColumn(child).instance;
-                newCol.parent = ref.instance;
-                newChildren.push(newCol);
-            });
-            ref.instance.children.reset(newChildren);
-            ref.instance.children.notifyOnChanges();
-        }
-        return ref;
-    }
-
-    protected _createColComponent(col) {
-        const factoryColumn = this.resolver.resolveComponentFactory(IgxColumnComponent);
-        const ref = this.viewRef.createComponent(IgxColumnComponent, { injector: this.viewRef.injector });
-        factoryColumn.inputs.forEach((input) => {
-            const propName = input.propName;
-            if (!(col[propName] instanceof IgxSummaryOperand)) {
-                ref.instance[propName] = col[propName];
-            } else {
-                ref.instance[propName] = col[propName].constructor;
-            }
-        });
-        return ref;
-    }
-
     protected getGridsForIsland(rowIslandID: string) {
         return this.hgridAPI.getChildGridsForRowIsland(rowIslandID);
     }