Attribute Macro scylla_udf::export_udt

#[export_udt]

This macro allows mapping a Rust struct to a UDT from Scylla, and using in a scylla_udf function.

To use it, you need to define a struct with the same fields as the Scylla UDT. For example, for a UDT defined as:

CREATE TYPE udt (
    a int,
    b double,
    c text,
);

you need to define a struct:

#[scylla_udf::export_udt]
struct Udt {
    a: i32,
    b: f64,
    c: String,
}