Horton

Re: cataloguing NOT NULL constraints

Dean Rasheed <dean.a.rasheed@gmail.com>

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From: Dean Rasheed <dean.a.rasheed@gmail.com>
To: Alvaro Herrera <alvherre@alvh.no-ip.org>
Cc: Peter Eisentraut <peter@eisentraut.org>, pgsql-hackers@lists.postgresql.org
Date: 2023-07-24T19:05:39Z
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, 24 Jul 2023 at 17:42, Alvaro Herrera <alvherre@alvh.no-ip.org> wrote:
>
> On 2023-Jul-24, Dean Rasheed wrote:
>
> > Something else I noticed: the error message from ALTER TABLE ... ADD
> > CONSTRAINT in the case of a duplicate constraint name is not very
> > friendly:
> >
> > ERROR:  duplicate key value violates unique constraint
> > "pg_constraint_conrelid_contypid_conname_index"
> > DETAIL:  Key (conrelid, contypid, conname)=(16540, 0, nn) already exists.
> >

To reproduce this error, try to create 2 constraints with the same
name on different columns:

create table foo(a int, b int);
alter table foo add constraint nn not null a;
alter table foo add constraint nn not null b;

I found another, separate issue:

create table p1(a int not null);
create table p2(a int);
create table foo () inherits (p1,p2);
alter table p2 add not null a;

ERROR:  column "a" of table "foo" is already NOT NULL

whereas doing "alter table p2 alter column a set not null" works OK,
merging the constraints as expected.

Regards,
Dean