fix schema GetIdentityFieldValuesMap interface or ptr (#6417)

Co-authored-by: uptutu <yitao.gong@vzenith.com>

schema/utils.go

@@ -115,6 +115,11 @@ func GetIdentityFieldValuesMap(ctx context.Context, reflectValue reflect.Value,
 		notZero, zero bool
 	)
 
+	if reflectValue.Kind() == reflect.Ptr ||
+		reflectValue.Kind() == reflect.Interface {
+		reflectValue = reflectValue.Elem()
+	}
+
 	switch reflectValue.Kind() {
 	case reflect.Struct:
 		results = [][]interface{}{make([]interface{}, len(fields))}