diff --git a/expression/builtin_json.go b/expression/builtin_json.go
index e828cd11764af..e9f803dcc86df 100644
--- a/expression/builtin_json.go
+++ b/expression/builtin_json.go
@@ -772,28 +772,18 @@ func (c *jsonMemberOfFunctionClass) getFunction(ctx sessionctx.Context, args []E
 	if err := c.verifyArgs(args); err != nil {
 		return nil, err
 	}
-
-	argTps := []types.EvalType{args[0].GetType().EvalType(), types.ETJson}
+	argTps := []types.EvalType{types.ETJson, types.ETJson}
 	bf, err := newBaseBuiltinFuncWithTp(ctx, c.funcName, args, types.ETInt, argTps...)
 	if err != nil {
 		return nil, err
 	}
+	DisableParseJSONFlag4Expr(args[0])
 	sig := &builtinJSONMemberOfSig{bf}
 	return sig, nil
 }
 
 func (b *builtinJSONMemberOfSig) evalInt(row chunk.Row) (res int64, isNull bool, err error) {
-	var target types.BinaryJSON
-	if b.args[0].GetType().EvalType() != types.ETJson {
-		eval, err := b.args[0].Eval(row)
-		if err != nil || eval.IsNull() {
-			return 0, eval.IsNull(), err
-		}
-		target = types.CreateBinaryJSON(eval.GetValue())
-	} else {
-		target, isNull, err = b.args[0].EvalJSON(b.ctx, row)
-	}
-
+	target, isNull, err := b.args[0].EvalJSON(b.ctx, row)
 	if isNull || err != nil {
 		return res, isNull, err
 	}
diff --git a/types/json_binary_functions.go b/types/json_binary_functions.go
index 88de1f6a1ef1e..7c4d7bf7f97bc 100644
--- a/types/json_binary_functions.go
+++ b/types/json_binary_functions.go
@@ -1127,9 +1127,9 @@ func OverlapsBinaryJSON(obj, target BinaryJSON) bool {
 	case JSONTypeCodeArray:
 		if target.TypeCode == JSONTypeCodeArray {
 			for i := 0; i < obj.GetElemCount(); i++ {
-				o := obj.arrayGetElem(i)
+				o := obj.ArrayGetElem(i)
 				for j := 0; j < target.GetElemCount(); j++ {
-					if CompareBinaryJSON(o, target.arrayGetElem(j)) == 0 {
+					if CompareBinaryJSON(o, target.ArrayGetElem(j)) == 0 {
 						return true
 					}
 				}
@@ -1138,7 +1138,7 @@ func OverlapsBinaryJSON(obj, target BinaryJSON) bool {
 		}
 		elemCount := obj.GetElemCount()
 		for i := 0; i < elemCount; i++ {
-			if CompareBinaryJSON(obj.arrayGetElem(i), target) == 0 {
+			if CompareBinaryJSON(obj.ArrayGetElem(i), target) == 0 {
 				return true
 			}
 		}