| From: | Alexander Korotkov <aekorotkov(at)gmail(dot)com> |
|---|---|
| To: | Alexander Lakhin <exclusion(at)gmail(dot)com> |
| Cc: | Andrei Lepikhov <a(dot)lepikhov(at)postgrespro(dot)ru>, "Gregory Stark (as CFM)" <stark(dot)cfm(at)gmail(dot)com>, Michał Kłeczek <michal(at)kleczek(dot)org>, PostgreSQL Hackers <pgsql-hackers(at)lists(dot)postgresql(dot)org>, Richard Guo <guofenglinux(at)gmail(dot)com> |
| Subject: | Re: Removing unneeded self joins |
| Date: | 2024-01-08 20:20:36 |
| Message-ID: | CAPpHfduYKqbWWT=YuBJyoExrwsJSgjUuJN1Gsr2YZMG=nh_ctQ@mail.gmail.com |
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| Lists: | pgsql-hackers |
On Mon, Jan 8, 2024 at 10:00 PM Alexander Lakhin <exclusion(at)gmail(dot)com> wrote:
> Please look at the following query which produces an incorrect result since
> d3d55ce57:
> CREATE TABLE t(a int PRIMARY KEY, b int);
> INSERT INTO t VALUES (1, 1), (2, 1);
> SELECT * FROM t WHERE EXISTS (SELECT * FROM t t2 WHERE t2.a = t.b AND t2.b > 0);
>
> a | b
> ---+---
> 1 | 1
> (1 row)
>
> I think that the expected result is:
> a | b
> ---+---
> 1 | 1
> 2 | 1
> (2 rows)
Thank you for your report. I'm looking at this now.
------
Regards,
Alexander Korotkov
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