BUG #10060: Distinct SQL results

The following bug has been logged on the website:

Bug reference:      10060
Logged by:          Omar Pessoa
Email address:      omar.pessoa@gmail.com
PostgreSQL version: 9.3.4
Operating system:   Windows 7.
Description:

-- work

select t.unnest, r.id from (select
unnest((string_to_array(seq_road,',')::int[])) from rota_data d where d.num
= 1) as t, ruas r where r.id =  t.unnest

-- dont work
select t.unnest, r.id, r.logradouro from (select
unnest((string_to_array(seq_road,',')::int[])) from rota_data d where d.num
= 1) as t, ruas r where r.id =  t.unnest

-- work
select t.unnest, r.id, r.logradouro from (select
unnest(string_to_array(string_agg(seq_road,','),',')::int[]) from rota_data
d where d.num = 1) as t, ruas r, ruas w where r.id = w.id AND w.id =
t.unnest