Horton

Re: SQL:2011 application time

Paul A Jungwirth <pj@illuminatedcomputing.com>

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From: Paul Jungwirth <pj@illuminatedcomputing.com>
To: jian he <jian.universality@gmail.com>
Cc: Isaac Morland <isaac.morland@gmail.com>, Robert Haas <robertmhaas@gmail.com>, Jeff Davis <pgsql@j-davis.com>, Peter Eisentraut <peter@eisentraut.org>, PostgreSQL Hackers <pgsql-hackers@lists.postgresql.org>
Date: 2024-07-25T15:52:44Z
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. Rename gist stratnum support function

  2. Remove support for temporal RESTRICT foreign keys

  3. Cache NO ACTION foreign keys separately from RESTRICT foreign keys

  4. Fix NO ACTION temporal foreign keys when the referenced endpoints change

  5. Improve whitespace in without_overlaps test

  6. Tests for logical replication with temporal keys

  7. Support for GiST in get_equal_strategy_number()

  8. Make the conditions in IsIndexUsableForReplicaIdentityFull() more explicit

  9. Replace get_equal_strategy_number_for_am() by get_equal_strategy_number()

  10. Improve internal logical replication error for missing equality strategy

  11. Simplify IsIndexUsableForReplicaIdentityFull()

  12. Fix ALTER TABLE / REPLICA IDENTITY for temporal tables

  13. doc: Update pg_constraint.conexclop docs for WITHOUT OVERLAPS

  14. doc: Add PERIOD to ALTER TABLE reference docs

  15. doc: Add WITHOUT OVERLAPS to ALTER TABLE reference docs

  16. Add temporal FOREIGN KEY contraints

  17. Add temporal PRIMARY KEY and UNIQUE constraints

  18. Add stratnum GiST support function

  19. Avoid crashing when a JIT-inlined backend function throws an error.

  20. Revert temporal primary keys and foreign keys

  21. Fix ON CONFLICT DO NOTHING/UPDATE for temporal indexes

  22. Add test for REPLICA IDENTITY with a temporal key

  23. Use half-open interval notation in without_overlaps tests

  24. Use daterange and YMD in without_overlaps tests instead of tsrange.

  25. Rename pg_constraint.conwithoutoverlaps to conperiod

  26. Fix comment on gist_stratnum_btree

  27. Add missing TAP test name

  28. Improve error handling of HMAC computations

  29. Rename functions to avoid future conflicts

Attachments

On 7/23/24 09:08, Paul Jungwirth wrote:
> One tempting alternative though is to let exclusion constraints do the not-empty check, instead of
> putting it in the executor. It would be an extra check we do only when the constraint has
> pg_constraint.conperiod. Then we don't need to add & maintain pg_class.relwithoutoverlaps, and we don't
> need a relcache change, and we don't need so much extra code to check existing rows when you add the
> constraint. It doesn't use the existing available exclusion constraint functionality, but if we're
> willing to extend the executor to know about WITHOUT OVERLAPS, I guess we could teach exclusion
> constraints about it instead. Doing the check there does seem to have better locality with the feature.
> So I think I will try that out as well.

Here is a patch moving the not-empty check into check_exclusion_or_unique_constraint. That is a more 
logical place for it than ExecConstraints, since WITHOUT OVERLAPS is part of the index constraint 
(not a CHECK constraint). At that point we've already looked up all the information we need. So 
there is no extra cost for non-temporal tables, and no need to change pg_class or add to the 
relcache. Also putting it there means we don't need any extra code to enforce non-empties when we 
build the index or do anything else with it.

I think this is the nicest solution we can expect. It is even cleaner than the &&& ideas. So 
hopefully this gets us back to where we were when we decided to commit PKs & FKs to v17.

As before, I've left the nonempty check as a separate patch to make reviewing easier, but when 
committing I would squash it with the PK patch.

Rebased to 05faf06e9c.

Yours,

-- 
Paul              ~{:-)
pj@illuminatedcomputing.com