Re: Custom shuffle function stopped working in 9.6

On 02/11/2017 11:36 AM, Adrian Klaver wrote:
> On 02/11/2017 09:17 AM, Alexander Farber wrote:
>> I think ORDER BY RANDOM() has stopped working in 9.6.2:
>>
>> words=> select unnest(ARRAY['a','b','c','d','e','f']) order by random();
>> unnest
>> --------
>> a
>> b
>> c
>> d
>> e
>> f
>> (6 rows)
>>
> postgres=> select version();
> version
> -------------------------------------------------------------------------------------
> PostgreSQL 9.6.1 on x86_64-pc-linux-gnu, compiled by gcc (SUSE Linux) 4.8.5, 64-bit
> (1 row)
>
> postgres=> select * from unnest(ARRAY['a','b','c','d','e','f']) order by random();
> unnest
> --------
> d
> c
> a
> f
> e
> b
> (6 rows)
>
> postgres=> select * from unnest(ARRAY['a','b','c','d','e','f']) order by random();
> unnest
> --------
> b
> d
> e
> c
> a
> f
> (6 rows)
>
>
>

I can duplicate issue on 9.6.2.

jack=# select version();
version
----------------------------------------------------------------------------------------------------------
PostgreSQL 9.6.2 on x86_64-pc-linux-gnu, compiled by gcc (Ubuntu 5.3.1-14ubuntu2) 5.3.1 20160413, 64-bit
(1 row)

jack=# select unnest(ARRAY['a','b','c','d','e','f']) order by random();
unnest
--------
a
b
c
d
e
f
(6 rows)

jack=# select unnest(ARRAY['a','b','c','d','e','f']) order by random();
unnest
--------
a
b
c
d
e
f
(6 rows)

Jack