Re: [PATCH] expand the units that pg_size_pretty supports on output

[David Rowley]

 tOn Thu, 8 Jul 2021 at 20:23, Dean Rasheed <dean.a.rash...@gmail.com> wrote:
>
> > On Thu, 8 Jul 2021 at 13:31, David Rowley <dgrowle...@gmail.com> wrote:
> > Here's a patch which I believe makes pg_size_pretty() and
> > pg_size_pretty_numeric() match in regards to negative values.
>
> LGTM, except I think it's worth also making the numeric code not refer
> to bit shifting either.
>
> > Maybe this plus your regression test would be ok to back-patch?
>
> +1
>
> Here's an update with matching updates to the numeric code, plus the
> regression tests.

Looks good.

I gave it a bit of exercise by running pgbench and calling this procedure:

CREATE OR REPLACE PROCEDURE public.test_size_pretty2()
 LANGUAGE plpgsql
AS $procedure$
declare b bigint;
begin
        FOR i IN 1..1000 LOOP
                b := 0 - (random() * 9223372036854775807)::bigint;
                if pg_size_pretty(b) <> pg_size_pretty(b::numeric) then
                        raise notice '%. % != %', b,
pg_size_pretty(b), pg_size_pretty(b::numeric);
                end if;
        END LOOP;
END;
$procedure$

It ran 8526956 times, so with the loop that's 8.5 billion random
numbers. No variations between the two functions.  I got the same
after removing the 0 - to test positive numbers.

If you like, I can push this in my morning, or if you'd rather do it
yourself, please go ahead.

David