From 444d8c2399a382cf61e7dc4d918f15e2656e4a12 Mon Sep 17 00:00:00 2001
From: xuhuaiyu <391585975@qq.com>
Date: Thu, 2 Dec 2021 15:39:29 +0800
Subject: [PATCH] address comment

---
 util/chunk/mutrow.go | 5 +----
 1 file changed, 1 insertion(+), 4 deletions(-)

diff --git a/util/chunk/mutrow.go b/util/chunk/mutrow.go
index 6a9a51e9457d5..c7544194558be 100644
--- a/util/chunk/mutrow.go
+++ b/util/chunk/mutrow.go
@@ -215,7 +215,7 @@ func cleanColOfMutRow(col *Column) {
 	for i := range col.offsets {
 		col.offsets[i] = 0
 	}
-	col.nullBitmap[0] = 1
+	col.nullBitmap[0] = 0
 }
 
 // SetRow sets the MutRow with Row.
@@ -224,7 +224,6 @@ func (mr MutRow) SetRow(row Row) {
 		mrCol := mr.c.columns[colIdx]
 		cleanColOfMutRow(mrCol)
 		if rCol.IsNull(row.idx) {
-			mrCol.nullBitmap[0] = 0
 			continue
 		}
 		elemLen := len(rCol.elemBuf)
@@ -249,7 +248,6 @@ func (mr MutRow) SetValue(colIdx int, val interface{}) {
 	col := mr.c.columns[colIdx]
 	cleanColOfMutRow(col)
 	if val == nil {
-		col.nullBitmap[0] = 0
 		return
 	}
 	switch x := val.(type) {
@@ -297,7 +295,6 @@ func (mr MutRow) SetDatum(colIdx int, d types.Datum) {
 	col := mr.c.columns[colIdx]
 	cleanColOfMutRow(col)
 	if d.IsNull() {
-		col.nullBitmap[0] = 0
 		return
 	}
 	switch d.Kind() {