Different return type of the RANK() window function in MySQL and MariaDB?

[alokmahor]

I am accessing a MySQL and MariaDB database using Rust with SeaORM, and my query includes the RANK() window function.

In MySQL, I can fetch the rank column value using u32 (unsigned integer),
In MariaDB, this does not work. I have to use i32 (signed integer) instead.

Here’s an example query:

SELECT RANK() OVER (ORDER BY some_column DESC) AS rank_value
FROM some_table;

How can I find out the exact return type of RANK() in MySQL and MariaDB? Is there any SQL command by which I can see and confirm it myself? How can handle this different return type in Rust with SeaORM?