From 88067d99e3cb5c0c2a67b8f94ea2baf1a64265a1 Mon Sep 17 00:00:00 2001
From: Stefan Stoyanov <sstoyanov@infragistics.com>
Date: Tue, 6 Nov 2018 18:06:23 +0200
Subject: [PATCH] fix(igx-grid): Clear filter when value is cleared from input,
 #2945

---
 .../src/lib/grids/filtering/grid-filtering.service.ts     | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/projects/igniteui-angular/src/lib/grids/filtering/grid-filtering.service.ts b/projects/igniteui-angular/src/lib/grids/filtering/grid-filtering.service.ts
index 33ac282b511..1a3e8d5c6c2 100644
--- a/projects/igniteui-angular/src/lib/grids/filtering/grid-filtering.service.ts
+++ b/projects/igniteui-angular/src/lib/grids/filtering/grid-filtering.service.ts
@@ -204,6 +204,14 @@ export class IgxFilteringService implements OnDestroy {
         for (let i = 0; i < expressionsList.length; i++) {
             currExpressionUI = expressionsList[i];
 
+            if (!currExpressionUI.expression.condition.isUnary && currExpressionUI.expression.searchVal === null) {
+                if (currExpressionUI.afterOperator === FilteringLogic.And && !currAndBranch) {
+                    currAndBranch = new FilteringExpressionsTree(FilteringLogic.And, columnId);
+                    expressionsTree.filteringOperands.push(currAndBranch);
+                }
+                continue;
+            }
+
             if ((currExpressionUI.beforeOperator === undefined || currExpressionUI.beforeOperator === null ||
                  currExpressionUI.beforeOperator === FilteringLogic.Or) &&
                 currExpressionUI.afterOperator === FilteringLogic.And) {