From a222c1f067b12974cf66ef910047e04132030a7b Mon Sep 17 00:00:00 2001
From: sylwiaszunejko <sylwia.szunejko@gmail.com>
Date: Wed, 5 Jun 2024 13:57:55 +0200
Subject: [PATCH] Marshal missing UDT fields as null instead of failing

We can't return an error in case a field is added to the UDT,
otherwise existing code would break by simply altering the UDT in the
database. For extra fields at the end of the UDT put nulls to be in
line with gocql, but also python-driver and java-driver.

In gocql it was fixed in https://github.com/scylladb/gocql/commit/d2ed1bb74f3118a83a352e9ce912be765001efa4
---
 udt.go | 12 +++++++++---
 1 file changed, 9 insertions(+), 3 deletions(-)

diff --git a/udt.go b/udt.go
index 1da938e..63551f7 100644
--- a/udt.go
+++ b/udt.go
@@ -39,11 +39,17 @@ func makeUDT(value reflect.Value, mapper *reflectx.Mapper, unsafe bool) udt {
 
 func (u udt) MarshalUDT(name string, info gocql.TypeInfo) ([]byte, error) {
 	value, ok := u.field[name]
-	if !ok {
-		return nil, fmt.Errorf("missing name %q in %s", name, u.value.Type())
+
+	var data []byte
+	var err error
+	if ok {
+		data, err = gocql.Marshal(info, value.Interface())
+		if err != nil {
+			return nil, err
+		}
 	}
 
-	return gocql.Marshal(info, value.Interface())
+	return data, err
 }
 
 func (u udt) UnmarshalUDT(name string, info gocql.TypeInfo, data []byte) error {