diff --git a/expression/expression.go b/expression/expression.go
index de6bb1cab5e54..20178919a89b4 100644
--- a/expression/expression.go
+++ b/expression/expression.go
@@ -1018,7 +1018,7 @@ func scalarExprSupportedByFlash(function *ScalarFunction) bool {
 			tipb.ScalarFuncSig_CastRealAsInt, tipb.ScalarFuncSig_CastRealAsDecimal, tipb.ScalarFuncSig_CastRealAsString, tipb.ScalarFuncSig_CastRealAsTime,
 			tipb.ScalarFuncSig_CastStringAsInt, tipb.ScalarFuncSig_CastStringAsDecimal, tipb.ScalarFuncSig_CastStringAsString, tipb.ScalarFuncSig_CastStringAsTime,
 			tipb.ScalarFuncSig_CastDecimalAsInt, tipb.ScalarFuncSig_CastDecimalAsDecimal, tipb.ScalarFuncSig_CastDecimalAsString, tipb.ScalarFuncSig_CastDecimalAsTime,
-			tipb.ScalarFuncSig_CastTimeAsInt, tipb.ScalarFuncSig_CastTimeAsDecimal, tipb.ScalarFuncSig_CastTimeAsTime:
+			tipb.ScalarFuncSig_CastTimeAsInt, tipb.ScalarFuncSig_CastTimeAsDecimal, tipb.ScalarFuncSig_CastTimeAsTime, tipb.ScalarFuncSig_CastIntAsReal, tipb.ScalarFuncSig_CastRealAsReal:
 			return true
 		}
 	case ast.DateAdd:
diff --git a/planner/core/testdata/integration_serial_suite_out.json b/planner/core/testdata/integration_serial_suite_out.json
index 1f25f899a68d9..026ef6ea1bce7 100644
--- a/planner/core/testdata/integration_serial_suite_out.json
+++ b/planner/core/testdata/integration_serial_suite_out.json
@@ -13,8 +13,8 @@
       {
         "SQL": "explain format = 'brief' select * from t where cast(t.a as float) + 3 = 5.1",
         "Plan": [
-          "Selection 10000.00 root  eq(plus(cast(test.t.a, float BINARY), 3), 5.1)",
-          "└─TableReader 10000.00 root  data:TableFullScan",
+          "TableReader 8000.00 root  data:Selection",
+          "└─Selection 8000.00 cop[tiflash]  eq(plus(cast(test.t.a, float BINARY), 3), 5.1)",
           "  └─TableFullScan 10000.00 cop[tiflash] table:t keep order:false, stats:pseudo"
         ]
       },