Build Postgres Functions in Rust on Amazon RDS

Looks like AWS announced[0] plrust support for Postgres today, but this one has a few more details, comparing a plv8 function and a plrust function.

the tldr is that you can write a function like this:

    CREATE OR REPLACE FUNCTION public.array_sum(x float8[])
    RETURNS float8
    LANGUAGE plrust
    IMMUTABLE PARALLEL SAFE STRICT
    AS $$
        let sum: f64 = x.iter()
            .map(|&xi| (xi.unwrap()))
            .sum();
    
        Ok(Some(sum))
    $$;

and everythign between the $$ is Rust code. This is obviously a bit more approachable for developers who don't like SQL, and doesn't have the performance penalty of something like plv8 (for computational-heavy functions at least)

[0] https://aws.amazon.com/about-aws/whats-new/2023/05/amazon-rd...