| From: | Alexander Korotkov <aekorotkov(at)gmail(dot)com> |
|---|---|
| To: | Ranier Vilela <ranier(dot)vf(at)gmail(dot)com> |
| Cc: | Alena Rybakina <a(dot)rybakina(at)postgrespro(dot)ru>, PostgreSQL Hackers <pgsql-hackers(at)lists(dot)postgresql(dot)org>, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, Andrei Lepikhov <lepihov(at)gmail(dot)com>, Robert Haas <robertmhaas(at)gmail(dot)com>, Richard Guo <guofenglinux(at)gmail(dot)com>, Alexander Lakhin <exclusion(at)gmail(dot)com>, "Gregory Stark (as CFM)" <stark(dot)cfm(at)gmail(dot)com>, Michał Kłeczek <michal(at)kleczek(dot)org>, Dean Rasheed <dean(dot)a(dot)rasheed(at)gmail(dot)com> |
| Subject: | Re: Removing unneeded self joins |
| Date: | 2025-04-03 16:02:16 |
| Message-ID: | CAPpHfdtTxSs+t8PXjJ_EC5roaQRLPyxt71M=AJvrGjYFC-wK5g@mail.gmail.com |
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| Lists: | pgsql-hackers |
Hi all,
I've got an off-list bug report from Alexander Lakhin involving a
placeholder variable. Alena and Andrei proposed a fix. It is fairly
simple: we just shouldn't remove PHVs during self-join elimination, as
they might still be referenced from other parts of a query. The patch
is attached. I'm going to fix this if no objections.
------
Regards,
Alexander Korotkov
Supabase
| Attachment | Content-Type | Size |
|---|---|---|
| v1-0001-Disallow-removing-placeholders-during-Self-Join-E.patch | application/octet-stream | 5.2 KB |
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