Horton

Re: cataloguing NOT NULL constraints

Alvaro Herrera <alvherre@alvh.no-ip.org>

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From: Alvaro Herrera <alvherre@alvh.no-ip.org>
To: Amit Langote <amitlangote09@gmail.com>
Cc: Laurenz Albe <laurenz.albe@cybertec.at>, Pg Hackers <pgsql-hackers@lists.postgresql.org>
Date: 2022-09-09T17:58:13Z
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

Attachments

There were a lot more problems in that submission than I at first
realized, and I had to rewrite a lot of code in order to fix them.  I
have fixed all the user-visible problems I found in this version, and
reviewed the tests results more carefully so I am now more confident
that behaviourally it's doing the right thing; but

1. the pg_upgrade test problem is still unaddressed,
2. I haven't verified that catalog contents is correct, especially
   regarding dependencies,
3. there are way too many XXX and FIXME comments sprinkled everywhere.

I'm sure a couple of these XXX comments can be left for later work, and
there's a few that should be dealt with by merely removing them; but the
others (and all FIXMEs) represent pending work.

Also, I'm not at all happy about having this new ConstraintNotNull
artificial node there; perhaps this can be solved by using a regular
Constraint with some new flag, or maybe it will even work without any
extra flags by the fact that the node appears where it appears.  Anyway,
requires investigation.  Also, the AT_SetAttNotNull continues to irk me.

test_ddl_deparse is also unhappy.  This is probably an easy fix;
apparently, ATExecDropConstraint has been doing things wrong forever.

Anyway, here's version 2 of this, with apologies for those who spent
time reviewing version 1 with all its brokenness.

-- 
Álvaro Herrera         PostgreSQL Developer  —  https://www.EnterpriseDB.com/
"On the other flipper, one wrong move and we're Fatal Exceptions"
(T.U.X.: Term Unit X  - http://www.thelinuxreview.com/TUX/)