Re: Key joins

Joel Jacobson <joel@compiler.org>

From: "Joel Jacobson" <joel@compiler.org>

To: pgsql-hackers <pgsql-hackers@postgresql.org>

Cc: "Arne Roland" <arne.roland@malkut.net>, "Anders Granlund" <anders.granlund.0@gmail.com>, "Andreas Karlsson" <andreas@proxel.se>, "Vik Fearing" <vik@chouppes.com>

Date: 2026-05-29T10:50:47Z

Lists: pgsql-hackers

Attachments

v6-0003-Add-information_schema.view_constraint_usage.patch.gz (application/x-gzip)
v6-0002-Implement-FOR-KEY-join-support.patch.gz (application/x-gzip)
v6-0001-Serialize-routine-definition-changes-with-depende.patch.gz (application/x-gzip)

On Fri, May 29, 2026, at 10:54, Joel Jacobson wrote:
> On Fri, May 29, 2026, at 09:45, Joel Jacobson wrote:
>> On Fri, May 29, 2026, at 07:08, Joel Jacobson wrote:
>>> On Fri, May 29, 2026, at 00:13, Joel Jacobson wrote:
>>>> On Thu, May 28, 2026, at 20:47, Joel Jacobson wrote:
>>>>> Hi hackers,
>>>>>
>>>>> This patch implements a new SQL language feature, that we intent to
>>>>> submit as a Change Proposal to the WG 3 SQL committee for the next
>>>>> meeting in Stockholm in June.  We would greatly appreciate any feedback
>>>>> from the community.
>>> ...
>>>>> The attached Discussion paper has also been published at https://keyjoin.org
>>>>> with all examples in the paper runnable in the browser using a patched PGLite.

v6 fixes a cfbot failure in an injection_points isolation test:

* 0002 stabilizes the expected completion order in two key-join deadlock
  tests using isolationtester permutation markers, instead of relying on
  scheduler-dependent output order.

* 0001 and 0003 are unchanged from v5.

/Joel