Function lead 

pub fn lead<T: SqlType + SingleValue + IntoNullable<Nullable: SingleValue>, value>(
    value: value,
) -> lead<T, <value as AsExpression<T>>::Expression>
where
    value: AsExpression<T>,

Value of argument from row leading current row within partition

Returns value evaluated at the row that is offset rows after the current row within the partition; if there is no such row, NULL will be returned instead.

See lead_with_offset and lead_with_offset_and_default for variants with configurable offset and default values.

This function must be used as window function. You need to call at least one of the methods WindowExpressionMethods from to use this function in your SELECT clause. It cannot be used outside of SELECT clauses.

For MySQL this function requires you to call .window_order()

let res = posts
    .select((
        title,
        user_id,
        lead(id).partition_by(user_id).window_order(user_id),
    ))
    .load::<(String, i32, Option<i32>)>(connection)?;
let expected = vec![
    ("My first post".to_owned(), 1, Some(2)),
    ("About Rust".into(), 1, None),
    ("My first post too".into(), 2, None),
];
assert_eq!(expected, res);