| From: | Israel Barth Rubio <barthisrael(at)gmail(dot)com> |
|---|---|
| To: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
| Cc: | Yugo NAGATA <nagata(at)sraoss(dot)co(dot)jp>, Peter Eisentraut <peter(dot)eisentraut(at)enterprisedb(dot)com>, pgsql-hackers(at)postgresql(dot)org, "David G(dot) Johnston" <david(dot)g(dot)johnston(at)gmail(dot)com>, Bruce Momjian <bruce(at)momjian(dot)us> |
| Subject: | Re: BUG #17434: CREATE/DROP DATABASE can be executed in the same transaction with other commands |
| Date: | 2022-11-25 15:17:02 |
| Message-ID: | CAO_rXXCqRiPLWjAKxP5P4RfTHWhwn-eo-uZeURib1umQSaEoag@mail.gmail.com |
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| Lists: | pgsql-bugs pgsql-hackers |
> Attached is a draft patch along the lines I speculated about above.
> It breaks backwards compatibility in that PreventInTransactionBlock
> commands will now be rejected if they're a non-first command in a
> pipeline. I think that's okay, and arguably desirable, for HEAD
> but I'm pretty uncomfortable about back-patching it.
I attempted to run these using HEAD, and it fails:
parse: create temporary table t1 (a int) on commit drop
bind
execute
parse: analyze t1
bind
execute
parse: select * from t1
bind
execute
sync
It then works fine after applying your patch!
Just for some context, this was brought by Peter E. based on an issue
reported by a customer. They are using PostgreSQL 11, and the issue
was observed after upgrading to PostgreSQL 11.17, which includes the
commit 9e3e1ac458abcda5aa03fa2a136e6fa492d58bd6. As a workaround
they downgraded the binaries to 11.16.
It would be great if we can back-patch this to all supported versions,
as the issue itself is currently affecting them all.
Regards,
Israel.
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