diff --git a/pkg/expression/expr_to_pb_test.go b/pkg/expression/expr_to_pb_test.go
index f6d9d94327999..0398952356b11 100644
--- a/pkg/expression/expr_to_pb_test.go
+++ b/pkg/expression/expr_to_pb_test.go
@@ -1822,6 +1822,16 @@ func TestExprPushDownToTiKV(t *testing.T) {
 			retType:      types.NewFieldType(mysql.TypeString),
 			args:         []Expression{stringColumn, intColumn, NewStrConst("hour")},
 		},
+		{
+			functionName: ast.FromUnixTime,
+			retType:      types.NewFieldType(mysql.TypeDatetime),
+			args:         []Expression{decimalColumn},
+		},
+		{
+			functionName: ast.FromUnixTime,
+			retType:      types.NewFieldType(mysql.TypeString),
+			args:         []Expression{decimalColumn, stringColumn},
+		},
 	}
 
 	ctx = mock.NewContext()
diff --git a/pkg/expression/infer_pushdown.go b/pkg/expression/infer_pushdown.go
index cad90178ab293..092be481d6039 100644
--- a/pkg/expression/infer_pushdown.go
+++ b/pkg/expression/infer_pushdown.go
@@ -209,8 +209,8 @@ func scalarExprSupportedByTiKV(ctx EvalContext, sf *ScalarFunction) bool {
 		ast.Hour, ast.Minute, ast.Second, ast.MicroSecond, ast.Month,
 		/* ast.DayName */ ast.DayOfMonth, ast.DayOfWeek, ast.DayOfYear,
 		/* ast.Weekday */ ast.WeekOfYear, ast.Year,
-		ast.FromDays,                  /* ast.ToDays */
-		ast.PeriodAdd, ast.PeriodDiff, /*ast.TimestampDiff, ast.DateAdd, ast.FromUnixTime,*/
+		ast.FromDays, /* ast.ToDays */
+		ast.PeriodAdd, ast.PeriodDiff /*ast.TimestampDiff, ast.DateAdd*/, ast.FromUnixTime,
 		/* ast.LastDay */
 		ast.Sysdate,
 
diff --git a/tests/integrationtest/r/planner/core/casetest/integration.result b/tests/integrationtest/r/planner/core/casetest/integration.result
index 4a623ec1553c3..3ade53c946a7d 100644
--- a/tests/integrationtest/r/planner/core/casetest/integration.result
+++ b/tests/integrationtest/r/planner/core/casetest/integration.result
@@ -42,10 +42,9 @@ explain format = 'brief' select * from t t1 left join t t2 on t1.a=t2.a where fr
 id	estRows	task	access object	operator info
 Projection	9990.00	root		planner__core__casetest__integration.t.a, planner__core__casetest__integration.t.b, planner__core__casetest__integration.t.a, planner__core__casetest__integration.t.b
 └─HashJoin	9990.00	root		inner join, equal:[eq(planner__core__casetest__integration.t.a, planner__core__casetest__integration.t.a)]
-  ├─Selection(Build)	7992.00	root		from_unixtime(cast(planner__core__casetest__integration.t.b, decimal(20,0) BINARY))
-  │ └─TableReader	9990.00	root		data:Selection
-  │   └─Selection	9990.00	cop[tikv]		not(isnull(planner__core__casetest__integration.t.a))
-  │     └─TableFullScan	10000.00	cop[tikv]	table:t2	keep order:false, stats:pseudo
+  ├─TableReader(Build)	7992.00	root		data:Selection
+  │ └─Selection	7992.00	cop[tikv]		from_unixtime(cast(planner__core__casetest__integration.t.b, decimal(20,0) BINARY)), not(isnull(planner__core__casetest__integration.t.a))
+  │   └─TableFullScan	10000.00	cop[tikv]	table:t2	keep order:false, stats:pseudo
   └─TableReader(Probe)	9990.00	root		data:Selection
     └─Selection	9990.00	cop[tikv]		not(isnull(planner__core__casetest__integration.t.a))
       └─TableFullScan	10000.00	cop[tikv]	table:t1	keep order:false, stats:pseudo