diff --git a/expression/integration_test.go b/expression/integration_test.go
index a5021ab2e21fd..11c5743a4a000 100644
--- a/expression/integration_test.go
+++ b/expression/integration_test.go
@@ -7435,3 +7435,15 @@ func TestIssue36358(t *testing.T) {
 	tk.MustQuery("select extract(day_microsecond from cast('2001-01-01 02:03:04.050607' as datetime(6))) from t").Check(testkit.Rows("1020304050607"))
 	tk.MustQuery("select extract(day_microsecond from c) from t").Check(testkit.Rows("1020304050607"))
 }
+
+func TestCastJSONOpaqueValueToNumeric(t *testing.T) {
+	store := testkit.CreateMockStore(t)
+	tk := testkit.NewTestKit(t, store)
+	tk.MustExec("use test")
+	tk.MustQuery("select cast(cast(b'010101' as json) as signed);").Check(testkit.Rows("0"))
+	tk.MustQuery("show warnings").Check(testkit.Rows("Warning 1292 Truncated incorrect INTEGER value: '\"base64:type253:FQ==\"'"))
+	tk.MustQuery("select cast(json_extract(json_objectagg('a', b'010101'), '$.a') as signed);").Check(testkit.Rows("0"))
+	tk.MustQuery("show warnings").Check(testkit.Rows("Warning 1292 Truncated incorrect INTEGER value: '\"base64:type253:FQ==\"'"))
+	tk.MustQuery("select cast(json_extract(json_objectagg('a', b'010101'), '$.a') as double);").Check(testkit.Rows("0"))
+	tk.MustQuery("show warnings").Check(testkit.Rows("Warning 1292 Truncated incorrect FLOAT value: '\"base64:type253:FQ==\"'"))
+}
diff --git a/types/convert.go b/types/convert.go
index a6e33d5b2c51b..f97eed3d24178 100644
--- a/types/convert.go
+++ b/types/convert.go
@@ -555,7 +555,7 @@ func ConvertJSONToInt64(sc *stmtctx.StatementContext, j json.BinaryJSON, unsigne
 // ConvertJSONToInt casts JSON into int by type.
 func ConvertJSONToInt(sc *stmtctx.StatementContext, j json.BinaryJSON, unsigned bool, tp byte) (int64, error) {
 	switch j.TypeCode {
-	case json.TypeCodeObject, json.TypeCodeArray:
+	case json.TypeCodeObject, json.TypeCodeArray, json.TypeCodeOpaque:
 		return 0, sc.HandleTruncate(ErrTruncatedWrongVal.GenWithStackByArgs("INTEGER", j.String()))
 	case json.TypeCodeLiteral:
 		switch j.Value[0] {
@@ -615,7 +615,7 @@ func ConvertJSONToInt(sc *stmtctx.StatementContext, j json.BinaryJSON, unsigned
 // ConvertJSONToFloat casts JSON into float64.
 func ConvertJSONToFloat(sc *stmtctx.StatementContext, j json.BinaryJSON) (float64, error) {
 	switch j.TypeCode {
-	case json.TypeCodeObject, json.TypeCodeArray:
+	case json.TypeCodeObject, json.TypeCodeArray, json.TypeCodeOpaque:
 		return 0, sc.HandleTruncate(ErrTruncatedWrongVal.GenWithStackByArgs("FLOAT", j.String()))
 	case json.TypeCodeLiteral:
 		switch j.Value[0] {
@@ -644,7 +644,7 @@ func ConvertJSONToDecimal(sc *stmtctx.StatementContext, j json.BinaryJSON) (*MyD
 	var err error = nil
 	res := new(MyDecimal)
 	switch j.TypeCode {
-	case json.TypeCodeObject, json.TypeCodeArray:
+	case json.TypeCodeObject, json.TypeCodeArray, json.TypeCodeOpaque:
 		err = ErrTruncatedWrongVal.GenWithStackByArgs("DECIMAL", j.String())
 	case json.TypeCodeLiteral:
 		switch j.Value[0] {
diff --git a/types/json/binary.go b/types/json/binary.go
index 1a2767fd0c89a..d03932722ba65 100644
--- a/types/json/binary.go
+++ b/types/json/binary.go
@@ -173,6 +173,9 @@ func (bj BinaryJSON) IsZero() bool {
 		isZero = false
 	case TypeCodeObject:
 		isZero = false
+	// FIXME: TiDB always casts the json to double BINARY so this function will never be called.
+	case TypeCodeOpaque:
+		isZero = false
 	}
 	return isZero
 }
diff --git a/types/json/binary_functions.go b/types/json/binary_functions.go
index 53b4fe6a08363..49ec801d794bf 100644
--- a/types/json/binary_functions.go
+++ b/types/json/binary_functions.go
@@ -627,7 +627,7 @@ func (bm *binaryModifier) rebuildTo(buf []byte) ([]byte, TypeCode) {
 	}
 	bj := bm.bj
 	switch bj.TypeCode {
-	case TypeCodeLiteral, TypeCodeInt64, TypeCodeUint64, TypeCodeFloat64, TypeCodeString:
+	case TypeCodeLiteral, TypeCodeInt64, TypeCodeUint64, TypeCodeFloat64, TypeCodeString, TypeCodeOpaque:
 		return append(buf, bj.Value...), bj.TypeCode
 	}
 	docOff := len(buf)
@@ -1008,6 +1008,9 @@ func PeekBytesAsJSON(b []byte) (n int, err error) {
 	case TypeCodeLiteral:
 		n = valTypeSize + 1
 		return
+	case TypeCodeOpaque:
+		bufLen, lenLen := binary.Uvarint(b[valTypeSize+1:])
+		return valTypeSize + 1 + int(bufLen) + lenLen, nil
 	}
 	err = errors.New("Invalid JSON bytes")
 	return
diff --git a/util/codec/codec_test.go b/util/codec/codec_test.go
index a1a5461dcd5fa..0d74b2a189364 100644
--- a/util/codec/codec_test.go
+++ b/util/codec/codec_test.go
@@ -872,6 +872,10 @@ func TestCut(t *testing.T) {
 			types.MakeDatums(json.CreateBinary("abc")),
 			types.MakeDatums(json.CreateBinary("abc")),
 		},
+		{
+			types.MakeDatums(json.CreateBinary(json.Opaque{TypeCode: mysql.TypeString, Buf: []byte("abc")})),
+			types.MakeDatums(json.CreateBinary(json.Opaque{TypeCode: mysql.TypeString, Buf: []byte("abc")})),
+		},
 	}
 	sc := &stmtctx.StatementContext{TimeZone: time.Local}
 	for i, datums := range table {