diff --git a/cmd/explaintest/r/explain_easy.result b/cmd/explaintest/r/explain_easy.result
index 0a4a8683215b6..f6631ebd4056b 100644
--- a/cmd/explaintest/r/explain_easy.result
+++ b/cmd/explaintest/r/explain_easy.result
@@ -137,7 +137,7 @@ id	count	task	operator info
 Limit_9	1.00	root	offset:0, count:1
 └─IndexLookUp_17	1.00	root	
   ├─Selection_14	3.00	cop	gt(test.t4.b, 1)
-  │ └─IndexScan_12	9.00	cop	table:t4, index:a, b, range:(1 +inf,+inf +inf], keep order:false, stats:pseudo
+  │ └─IndexScan_12	9.00	cop	table:t4, index:a, b, range:(1,+inf], keep order:false, stats:pseudo
   └─Limit_16	1.00	cop	offset:0, count:1
     └─Selection_15	1.00	cop	gt(test.t4.c, 1)
       └─TableScan_13	3.00	cop	table:t4, keep order:false
diff --git a/planner/core/physical_plan_test.go b/planner/core/physical_plan_test.go
index bc65157a79ed7..bd5e2d7388908 100644
--- a/planner/core/physical_plan_test.go
+++ b/planner/core/physical_plan_test.go
@@ -70,7 +70,7 @@ func (s *testPlanSuite) TestDAGPlanBuilderSimpleCase(c *C) {
 		// Test DNF condition + Double Read.
 		{
 			sql:  "select * from t where (t.c > 0 and t.c < 2) or (t.c > 4 and t.c < 6) or (t.c > 8 and t.c < 10) or (t.c > 12 and t.c < 14) or (t.c > 16 and t.c < 18)",
-			best: "IndexLookUp(Index(t.c_d_e)[(0 +inf,2 NULL) (4 +inf,6 NULL) (8 +inf,10 NULL) (12 +inf,14 NULL) (16 +inf,18 NULL)], Table(t))",
+			best: "IndexLookUp(Index(t.c_d_e)[(0,2) (4,6) (8,10) (12,14) (16,18)], Table(t))",
 		},
 		{
 			sql:  "select * from t where (t.c > 0 and t.c < 1) or (t.c > 2 and t.c < 3) or (t.c > 4 and t.c < 5) or (t.c > 6 and t.c < 7) or (t.c > 9 and t.c < 10)",
diff --git a/util/ranger/ranger.go b/util/ranger/ranger.go
index 0402209e25bb7..c7e8dce2a781f 100644
--- a/util/ranger/ranger.go
+++ b/util/ranger/ranger.go
@@ -333,22 +333,6 @@ func buildCNFIndexRange(sc *stmtctx.StatementContext, cols []*expression.Column,
 		fixPrefixColRange(ranges, lengths, newTp)
 	}
 
-	if len(ranges) > 0 && len(ranges[0].LowVal) < len(cols) {
-		for _, ran := range ranges {
-			if ran.HighExclude || ran.LowExclude {
-				if ran.HighExclude {
-					ran.HighVal = append(ran.HighVal, types.NewDatum(nil))
-				} else {
-					ran.HighVal = append(ran.HighVal, types.MaxValueDatum())
-				}
-				if ran.LowExclude {
-					ran.LowVal = append(ran.LowVal, types.MaxValueDatum())
-				} else {
-					ran.LowVal = append(ran.LowVal, types.NewDatum(nil))
-				}
-			}
-		}
-	}
 	return ranges, nil
 }
 
diff --git a/util/ranger/ranger_test.go b/util/ranger/ranger_test.go
index 89edd131736da..8d8ae3be3a825 100644
--- a/util/ranger/ranger_test.go
+++ b/util/ranger/ranger_test.go
@@ -346,14 +346,14 @@ func (s *testRangerSuite) TestIndexRange(c *C) {
 			exprStr:     `a LIKE 'abc%'`,
 			accessConds: `[like(test.t.a, abc%, 92)]`,
 			filterConds: "[]",
-			resultStr:   "[[\"abc\" NULL,\"abd\" NULL)]",
+			resultStr:   "[[\"abc\",\"abd\")]",
 		},
 		{
 			indexPos:    0,
 			exprStr:     "a LIKE 'abc_'",
 			accessConds: "[like(test.t.a, abc_, 92)]",
 			filterConds: "[like(test.t.a, abc_, 92)]",
-			resultStr:   "[(\"abc\" +inf,\"abd\" NULL)]",
+			resultStr:   "[(\"abc\",\"abd\")]",
 		},
 		{
 			indexPos:    0,
@@ -395,7 +395,7 @@ func (s *testRangerSuite) TestIndexRange(c *C) {
 			exprStr:     `a LIKE "\\\\a%"`,
 			accessConds: `[like(test.t.a, \\a%, 92)]`,
 			filterConds: "[]",
-			resultStr:   "[[\"\\a\" NULL,\"\\b\" NULL)]",
+			resultStr:   "[[\"\\a\",\"\\b\")]",
 		},
 		{
 			indexPos:    0,
@@ -444,7 +444,7 @@ func (s *testRangerSuite) TestIndexRange(c *C) {
 			exprStr:     "c not in (1, 2, 3)",
 			accessConds: "[not(in(test.t.c, 1, 2, 3))]",
 			filterConds: "[]",
-			resultStr:   "[(NULL +inf,1 NULL) (1 +inf,2 NULL) (2 +inf,3 NULL) (3 +inf,+inf +inf]]",
+			resultStr:   "[(NULL,1) (1,2) (2,3) (3,+inf]]",
 		},
 		{
 			indexPos:    1,
@@ -500,28 +500,28 @@ func (s *testRangerSuite) TestIndexRange(c *C) {
 			exprStr:     "(a > 'b' and a < 'bbb') or (a < 'cb' and a > 'a')",
 			accessConds: "[or(and(gt(test.t.a, b), lt(test.t.a, bbb)), and(lt(test.t.a, cb), gt(test.t.a, a)))]",
 			filterConds: "[]",
-			resultStr:   "[(\"a\" +inf,\"cb\" NULL)]",
+			resultStr:   "[(\"a\",\"cb\")]",
 		},
 		{
 			indexPos:    0,
 			exprStr:     "(a > 'a' and a < 'b') or (a >= 'b' and a < 'c')",
 			accessConds: "[or(and(gt(test.t.a, a), lt(test.t.a, b)), and(ge(test.t.a, b), lt(test.t.a, c)))]",
 			filterConds: "[]",
-			resultStr:   "[(\"a\" +inf,\"c\" NULL)]",
+			resultStr:   "[(\"a\",\"c\")]",
 		},
 		{
 			indexPos:    0,
 			exprStr:     "(a > 'a' and a < 'b' and b < 1) or (a >= 'b' and a < 'c')",
 			accessConds: "[or(and(gt(test.t.a, a), lt(test.t.a, b)), and(ge(test.t.a, b), lt(test.t.a, c)))]",
 			filterConds: "[or(and(and(gt(test.t.a, a), lt(test.t.a, b)), lt(test.t.b, 1)), and(ge(test.t.a, b), lt(test.t.a, c)))]",
-			resultStr:   "[(\"a\" +inf,\"c\" NULL)]",
+			resultStr:   "[(\"a\",\"c\")]",
 		},
 		{
 			indexPos:    0,
 			exprStr:     "(a in ('a', 'b') and b < 1) or (a >= 'b' and a < 'c')",
 			accessConds: "[or(and(in(test.t.a, a, b), lt(test.t.b, 1)), and(ge(test.t.a, b), lt(test.t.a, c)))]",
 			filterConds: "[]",
-			resultStr:   `[["a" -inf,"a" 1) ["b" NULL,"c" NULL)]`,
+			resultStr:   `[["a" -inf,"a" 1) ["b","c")]`,
 		},
 		{
 			indexPos:    0,
@@ -952,9 +952,9 @@ func (s *testRangerSuite) TestIndexRangeElimininatedProjection(c *C) {
 	testKit.MustQuery("explain select * from (select * from t union all select ifnull(a,b), b from t) sub where a > 0").Check(testkit.Rows(
 		"Union_11 2.00 root ",
 		"├─IndexReader_17 1.00 root index:IndexScan_16",
-		"│ └─IndexScan_16 1.00 cop table:t, index:a, b, range:(0 +inf,+inf +inf], keep order:false",
+		"│ └─IndexScan_16 1.00 cop table:t, index:a, b, range:(0,+inf], keep order:false",
 		"└─IndexReader_23 1.00 root index:IndexScan_22",
-		"  └─IndexScan_22 1.00 cop table:t, index:a, b, range:(0 +inf,+inf +inf], keep order:false",
+		"  └─IndexScan_22 1.00 cop table:t, index:a, b, range:(0,+inf], keep order:false",
 	))
 	testKit.MustQuery("select * from (select * from t union all select ifnull(a,b), b from t) sub where a > 0").Check(testkit.Rows(
 		"1 2",