chore(pivot): Adress comments

Author: mddragnev

projects/igniteui-angular/src/lib/data-operations/filtering-strategy.ts

@@ -140,23 +140,3 @@ export class FormattedValuesFilteringStrategy extends FilteringStrategy {
         return value;
     }
 }
-
-export class PivotFilteringStrategy extends FilteringStrategy {
-
-    constructor() {
-        super();
-    }
-
-    protected getFieldValue(rec: any, fieldName: string, isDate: boolean = false, isTime: boolean = false, grid?: GridType): any {
-        let value = resolveNestedPath(rec, fieldName);
-        if (value && !(value instanceof Object)) {
-            value = value && (isDate || isTime) ? parseDate(value) : value;
-            return value;
-        }
-        const config = (grid as PivotGridType).pivotConfiguration;
-        const allDimensions = config.rows.concat(config.columns).concat(config.filters).filter(x => x !== null && x !== undefined);
-        const flattenedDims = PivotUtil.flatten(allDimensions, 0);
-        const dimension = flattenedDims.find(x => x.memberName === fieldName);
-        return dimension.memberFunction ? dimension.memberFunction(rec) : value;
-    }
-}

projects/igniteui-angular/src/lib/grids/pivot-grid/pivot-filtering.service.ts

@@ -2,7 +2,7 @@ import { Injectable } from '@angular/core';
 import { IFilteringOperation } from '../../data-operations/filtering-condition';
 import { FilteringLogic } from '../../data-operations/filtering-expression.interface';
 import { FilteringExpressionsTree, IFilteringExpressionsTree } from '../../data-operations/filtering-expressions-tree';
-import { PivotFilteringStrategy } from '../../data-operations/filtering-strategy';
+import { DimensionValuesFilteringStrategy } from '../../data-operations/pivot-strategy';
 import { IgxFilteringService } from '../filtering/grid-filtering.service';
 import { IgxPivotGridComponent } from './pivot-grid.component';
 import { PivotUtil } from './pivot-util';
@@ -43,7 +43,7 @@ export class IgxPivotFilteringService extends IgxFilteringService {
         this.prepare_filtering_expression(filteringTree, fieldName, term, conditionOrExpressionsTree, ignoreCase, fieldFilterIndex);
         dim.filter = filteringTree;
         grid.filteringPipeTrigger++;
-        grid.filterStrategy = new PivotFilteringStrategy();
+        grid.filterStrategy = grid.filterStrategy ?? new DimensionValuesFilteringStrategy();
         if (allDimensions.indexOf(dim) !== -1) {
             // update columns
             (grid as any).setupColumns();