From: | Manvendra <manvendra2525(at)gmail(dot)com> |
---|---|
To: | Kieran McCusker <kieran(dot)mccusker(at)gmail(dot)com> |
Cc: | pgsql-bugs(at)lists(dot)postgresql(dot)org |
Subject: | Re: BUG #16548: Order by on array element giving disparity in result |
Date: | 2020-07-21 13:51:30 |
Message-ID: | CA+L9vQUJZ-_-mVXRg_LbWqy4aiBD0ydzJeym6kaRy3A7AudsKQ@mail.gmail.com |
Views: | Raw Message | Whole Thread | Download mbox | Resend email |
Thread: | |
Lists: | pgsql-bugs |
Alright! Just wanted to know how limit works here - How limit is showing
the different output
postgres=# select * from bint order by a[2] desc limit 5;
a
---------------
{14}
{10}
{14}
{10,14,10,10} <-- It comes prior to 5th record and consistently
whereas " select
* from bint order by a[2] desc;" showing something else consistently.
{10,14,14,14}
(5 rows)
On Tue, Jul 21, 2020 at 6:55 PM Kieran McCusker <kieran(dot)mccusker(at)gmail(dot)com>
wrote:
> Hi
>
> If you read the documentation
> https://www.postgresql.org/docs/8.3/queries-order.html you will see that
> nulls first is the default for desc. What you are seeing is the rows with
> nulls first and they can appear in any order as you have only ordered by
> [2] which these rows don't have. add nulls last after desc to get the order
> you want.
>
> Kieran
>
>
> On Tue, 21 Jul 2020 at 14:19, PG Bug reporting form <
> noreply(at)postgresql(dot)org> wrote:
>
>> The following bug has been logged on the website:
>>
>> Bug reference: 16548
>> Logged by: Manvendra Panwar
>> Email address: manvendra2525(at)gmail(dot)com
>> PostgreSQL version: 12.2
>> Operating system: Ubuntu 18.04.1 LTS
>> Description:
>>
>> create table bint (a int[]);
>> insert into bint values (array[14]);
>> insert into bint values (array[14]);
>> insert into bint values (array[10]);
>> insert into bint values (array[10,14,14,14]);
>> insert into bint values (array[10,14,10,10]);
>> insert into bint values (array[14,14,10,14]);
>> insert into bint values (array[10,14,14,14]);
>> insert into bint values (array[10,14]);
>> insert into bint values (array[10,14]);
>> insert into bint values (array[14,14,14,14]);
>> insert into bint values (array[10,14,10,10]);
>> insert into bint values (array[10,14]);
>> insert into bint values (array[10,14]);
>> insert into bint values (array[10,14]);
>> insert into bint values (array[10,14]);
>> insert into bint values (array[10,14]);
>> insert into bint values (array[14,14,14,10]);
>> insert into bint values (array[14,14,14,10]);
>> insert into bint values (array[14,14,14,14]);
>> insert into bint values (array[10,14]);
>> insert into bint values (array[10,14]);
>> insert into bint values (array[10,14,14,14]);
>> insert into bint values (array[10,14]);
>> commit;
>>
>>
>> postgres=# select * from bint order by a[2] desc;
>> a
>> ---------------
>> {14}
>> {14}
>> {10}
>> {10,14,14,14}
>> {10,14,10,10}
>> {14,14,10,14}
>> {10,14,14,14}
>> {10,14}
>> {10,14}
>> {14,14,14,14}
>> {10,14,10,10}
>> {10,14}
>> {10,14}
>> {10,14}
>> {10,14}
>> {10,14}
>> {14,14,14,10}
>> {14,14,14,10}
>> {14,14,14,14}
>> {10,14}
>> {10,14}
>> {10,14,14,14}
>> {10,14}
>> (23 rows)
>>
>> postgres=# select * from bint order by a[2] desc limit 5;
>> a
>> ---------------
>> {14}
>> {10}
>> {14}
>> {10,14,10,10}
>> {10,14,14,14}
>> (5 rows)
>>
>>
From | Date | Subject | |
---|---|---|---|
Next Message | PG Bug reporting form | 2020-07-21 13:55:48 | BUG #16549: "CASE" not work properly , the function works properly on PostgreSQL 9.6.8 |
Previous Message | Charles Zeng | 2020-07-21 13:41:13 | cannot find postgresqllogreaderadapter |