I have a a very large number of Parameters for a Query and I would like to merge 2 ValueLists

[WarrenN1]

I have 2 ValueLists that I need to merge because I have a query with a very large number of parameters. I do not want to have to pass all the values individually. How would I go about doing this? ValueList seems to have a private buffer for the serialized values.
Any help would be deeply appreciated.

More specifically, ValueList just takes a struct A for example and turns it into a SerializedResult of type
Result<Cow<SerializedValues>, SerializeValuesError>. My goal is I want to be able to take 2 structs struct A and struct B that both implement ValueList and pass them to a query. So I want to be able to merge them into 1 ValueList.

[wprzytula]

At the first glance, I don't immediately see a convenient solution to your problem.
In general though, I recommend using the new SerializeCql/SerializeRow trait tandem instead of the obsolete Value/ValueList pair.
What you could do is creating a wrapper struct that would take both A and B and implement SerializeRow on it manually so that it achieves what want to.

We can consider implementing a general adapter that would take two structs implementing SerializeRow and implement serialization of them consecutively as a row. At the moment I don't know yet whether this is even feasible, tbh.