On Sun, Sep 30, 2018 at 12:38:46AM +0100, Andrew Gierth wrote:
> >>>>> "Andrew" == Andrew Dunstan <[email protected]> writes:
>
> >> What is the size of a C "int" on this platform?
>
> Andrew> 4.
>
> Hmm.
>
> Because int being more than 32 bits is the simplest explanation for this
> difference.
>
> How about the output of this query:
>
> with d(a) as (values ('11111111-1111-1111-1111-111111111111'::uuid),
> ('22222222-2222-2222-2222-222222222222'::uuid),
> ('3f3e3c3b-3a30-3938-3736-353433a2313e'::uuid))
> select d1.a, d2.a, uuid_cmp(d1.a,d2.a) from d d1, d d2
> order by d1.a asc, d2.a desc;
That also appears to produce the same results:
With 9.4:
postgres=# select version();
version
-------------------------------------------------------------------------------------------------------------------
PostgreSQL 9.4.19 on s390x-ibm-linux-gnu, compiled by clang version 5.0.1
(tags/RELEASE_501/final 312548), 64-bit
(1 row)
...
a | a |
uuid_cmp
--------------------------------------+--------------------------------------+-------------
11111111-1111-1111-1111-111111111111 | 11111111-1111-1111-1111-111111111111 |
0
11111111-1111-1111-1111-111111111111 | 22222222-2222-2222-2222-222222222222 |
-2147483648
11111111-1111-1111-1111-111111111111 | 3f3e3c3b-3a30-3938-3736-353433a2313e |
-2147483648
22222222-2222-2222-2222-222222222222 | 11111111-1111-1111-1111-111111111111 |
1
22222222-2222-2222-2222-222222222222 | 22222222-2222-2222-2222-222222222222 |
0
22222222-2222-2222-2222-222222222222 | 3f3e3c3b-3a30-3938-3736-353433a2313e |
-2147483648
3f3e3c3b-3a30-3938-3736-353433a2313e | 11111111-1111-1111-1111-111111111111 |
1
3f3e3c3b-3a30-3938-3736-353433a2313e | 22222222-2222-2222-2222-222222222222 |
1
3f3e3c3b-3a30-3938-3736-353433a2313e | 3f3e3c3b-3a30-3938-3736-353433a2313e |
0
(9 rows)
Then with HEAD:
postgres=# select version();
version
--------------------------------------------------------------------------------------------------------------------
PostgreSQL 12devel on s390x-ibm-linux-gnu, compiled by clang version 5.0.1
(tags/RELEASE_501/final 312548), 64-bit
(1 row)
...
a | a |
uuid_cmp
--------------------------------------+--------------------------------------+-------------
11111111-1111-1111-1111-111111111111 | 11111111-1111-1111-1111-111111111111 |
0
11111111-1111-1111-1111-111111111111 | 22222222-2222-2222-2222-222222222222 |
-2147483648
11111111-1111-1111-1111-111111111111 | 3f3e3c3b-3a30-3938-3736-353433a2313e |
-2147483648
22222222-2222-2222-2222-222222222222 | 11111111-1111-1111-1111-111111111111 |
1
22222222-2222-2222-2222-222222222222 | 22222222-2222-2222-2222-222222222222 |
0
22222222-2222-2222-2222-222222222222 | 3f3e3c3b-3a30-3938-3736-353433a2313e |
-2147483648
3f3e3c3b-3a30-3938-3736-353433a2313e | 11111111-1111-1111-1111-111111111111 |
1
3f3e3c3b-3a30-3938-3736-353433a2313e | 22222222-2222-2222-2222-222222222222 |
1
3f3e3c3b-3a30-3938-3736-353433a2313e | 3f3e3c3b-3a30-3938-3736-353433a2313e |
0
(9 rows)
Regards,
Mark
--
Mark Wong http://www.2ndQuadrant.com/
PostgreSQL Development, 24x7 Support, RemoteDBA, Training & Services
