Horton

Re: cataloguing NOT NULL constraints

Bruce Momjian <bruce@momjian.us>

View thread
From: Bruce Momjian <bruce@momjian.us>
To: Robert Haas <robertmhaas@gmail.com>
Cc: Alvaro Herrera <alvherre@alvh.no-ip.org>, Kyotaro Horiguchi <horikyota.ntt@gmail.com>, exclusion@gmail.com, dean.a.rasheed@gmail.com, andrewbille@gmail.com, peter@eisentraut.org, pgsql-hackers@lists.postgresql.org, Justin Pryzby <pryzby@telsasoft.com>
Date: 2024-05-15T01:34:00Z
Lists: pgsql-hackers

Commits

Same data as JSON: GET /api/v1/messages/:b64id/commits the thread's linked commits as JSON, with link sources. API reference →

  1. Revert structural changes to not-null constraints

  2. Fix inconsistencies in error messages

  3. Disallow direct change of NO INHERIT of not-null constraints

  4. Disallow NO INHERIT not-null constraints on partitioned tables

  5. Better handle indirect constraint drops

  6. Don't try to assign smart names to constraints

  7. Fix restore of not-null constraints with inheritance

  8. ATTACH PARTITION: Don't match a PK with a UNIQUE constraint

  9. Fix propagating attnotnull in multiple inheritance

  10. Check stack depth in new recursive functions

  11. Move privilege check to the right place

  12. Update information_schema definition for not-null constraints

  13. Fix not-null constraint test

  14. Disallow changing NO INHERIT status of a not-null constraint

  15. Catalog not-null constraints

  16. parallel_schedule: add comment on event_trigger test dependency

  17. Revert "Catalog NOT NULL constraints" and fallout

  18. Adjust contrib/sepgsql regression test expected outputs.

  19. Fix table name clash in recently introduced test

  20. Catalog NOT NULL constraints

  21. Change the rules for inherited CHECK constraints to be essentially the same

On Mon, May 13, 2024 at 09:00:28AM -0400, Robert Haas wrote:
> > Specifically, the problem is that I mentioned that we could restrict the
> > NOT NULL NO INHERIT addition in pg_dump for primary keys to occur only
> > in pg_upgrade; but it turns this is not correct.  In normal
> > dump/restore, there's an additional table scan to check for nulls when
> > the constraints is not there, so the PK creation would become measurably
> > slower.  (In a table with a million single-int rows, PK creation goes
> > from 2000ms to 2300ms due to the second scan to check for nulls).
> 
> I have a feeling that any theory of the form "X only needs to happen
> during pg_upgrade" is likely to be wrong. pg_upgrade isn't really
> doing anything especially unusual: just creating some objects and
> loading data. Those things can also be done at other times, so
> whatever is needed during pg_upgrade is also likely to be needed at
> other times. Maybe that's not sound reasoning for some reason or
> other, but that's my intuition.

I assume Alvaro is saying that pg_upgrade has only a single session,
which is unique and might make things easier for him.

-- 
  Bruce Momjian  <bruce@momjian.us>        https://momjian.us
  EDB                                      https://enterprisedb.com

  Only you can decide what is important to you.