问plpgsql $[plpgsql]是相对的吗？

EN

create or replace function exc_using(int, text) returns int as
    $$
        declare i int;
        begin
        for i in execute 'select * from generate_series(1,$1) ' using $1+1 loop
            raise notice '% ', i;
            raise notice 'i + i *3: % ', i + i * 3;
        end loop;
        execute 'select $2 + $2 * 3 + length($1) '
            into i using $2, $1;
        return i;
        end
    $$
language plpgsql;

    execute 'select $2 + $2 * 3 + length($1) '
        into i using $2, $1;
    return i;

    execute 'select $1 + $1 * 3 + length($2) '
        into i using $1, $2;
    return i;