Horton

Re: SQL:2011 application time

jian he <jian.universality@gmail.com>

View thread
From: jian he <jian.universality@gmail.com>
To: Paul Jungwirth <pj@illuminatedcomputing.com>
Cc: Vik Fearing <vik@postgresfriends.org>, Peter Eisentraut <peter@eisentraut.org>, Corey Huinker <corey.huinker@gmail.com>, PostgreSQL Hackers <pgsql-hackers@lists.postgresql.org>
Date: 2023-09-08T01:24:22Z
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

On Sat, Sep 2, 2023 at 5:58 AM Paul Jungwirth
<pj@illuminatedcomputing.com> wrote:
>
>
> I don't quite understand this part:
>
>  >> Also, your implementation
>  >> requires at least one non-overlaps column, which also seems like a
>  >> confusing restriction.
>
> That's just a regular non-temporal constraint. Right? If I'm missing
> something let me know.
>

for a range primary key, is it fine to expect it to be unique, not
null and also not overlap? (i am not sure how hard to implement it).

-----------------------------------------------------------------
quote from 7IWD2-02-Foundation-2011-12.pdf. 4.18.3.2 Unique
constraints, page 97 of 1483.

4.18.3.2 Unique constraints In addition to the components of every
table constraint descriptor, a unique constraint descriptor includes:
— An indication of whether it was defined with PRIMARY KEY or UNIQUE.
— The names and positions of the unique columns specified in the
<unique column list>
 — If <without overlap specification> is specified, then the name of
the period specified.

If the table descriptor for base table T includes a unique constraint
descriptor indicating that the unique constraint was defined with
PRIMARY KEY, then the columns of that unique constraint constitute the
primary key of T. A table that has a primary key cannot have a proper
supertable.
A unique constraint that does not include a <without overlap
specification> on a table T is satisfied if and only if there do not
exist two rows R1 and R2 of T such that R1 and R2 have the same
non-null values in the unique columns. If a unique constraint UC on a
table T includes a <without overlap specification> WOS, then let
<application time period name> ATPN be the contained in WOS. UC is
satisfied if and only if there do not exist two rows R1 and R2 of T
such that R1 and R2 have the same non-null values in the unique
columns and the ATPN period values of R1 and R2 overlap. In addition,
if the unique constraint was defined with PRIMARY KEY, then it
requires that none of the values in the specified column or columns be
a null value.
-----------------------------------------------------------------
based on the above, the unique constraint does not specify that the
column list must be range type. UNIQUE (a, c WITHOUT OVERLAPS).
Here column "a" can be a range type (that have overlap property) and
can be not.
In fact, many of your primary key, foreign key regess test using
something like '[11,11]' (which make it more easy to understand),
which in logic is a non-range usage.
So UNIQUE (a, c WITHOUT OVERLAPS), column "a" be a non-range data type
does make sense?