Horton

Re: Built-in CTYPE provider

Jeff Davis <pgsql@j-davis.com>

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From: Jeff Davis <pgsql@j-davis.com>
To: Laurenz Albe <laurenz.albe@cybertec.at>, Noah Misch <noah@leadboat.com>
Cc: Peter Eisentraut <peter@eisentraut.org>, Daniel Verite <daniel@manitou-mail.org>, Jeremy Schneider <schneider@ardentperf.com>, Tom Lane <tgl@sss.pgh.pa.us>, Robert Haas <robertmhaas@gmail.com>, pgsql-hackers@postgresql.org
Date: 2024-07-18T17:13:34Z
Lists: pgsql-hackers 
On Thu, 2024-07-18 at 16:45 +0200, Laurenz Albe wrote:
> On Thu, 2024-07-18 at 07:00 -0700, Noah Misch wrote:
> >  What I am against is routinely updating the built-in provider to
> > adopt any changes
> > > that Unicode makes.

That is a perfectly reasonable position; please add it to the version
18 discussion[1].

> > Given all the messages on this thread, if the feature remains in
> > PostgreSQL, I
> > advise you to be ready to tolerate PostgreSQL "routinely updating
> > the built-in
> > provider to adopt any changes that Unicode makes".  Maybe someone
> > will change
> > something in v18 so it's not like that, but don't count on it.

...

> In that case I am against it.  Against the "routinely" in particular.

Also, please see my response[2] to Noah. I don't believe his statement
above is an accurate characterization. There's plenty of opportunity
for deliberation and compromise in version 18, and my mind is still
open to pretty much everything, up to and including freezing Unicode
updates if necessary[3].

Regards,
	Jeff Davis

[1]
https://www.postgresql.org/message-id/d75d2d0d1d2bd45b2c332c47e3e0a67f0640b49c.camel%40j-davis.com
[2]
https://www.postgresql.org/message-id/f29686018b4432a8ae2e535dbe19f0d88e7a79d5.camel@j-davis.com
[3]
https://www.postgresql.org/message-id/db496682c6656ac64433f05f8821e561bbf4d105.camel@j-davis.com

Commits

  1. Support PG_UNICODE_FAST locale in the builtin collation provider.

  2. Support Unicode full case mapping and conversion.

  3. Fix test failures when language environment is not UTF-8.

  4. Add unicode_strtitle() for Unicode Default Case Conversion.

  5. Use version for builtin collations.

  6. Fix convert_case(), introduced in 5c40364dd6.

  7. Inline basic UTF-8 functions.

  8. Support C.UTF-8 locale in the new builtin collation provider.

  9. Fix another warning, introduced by 846311051e.

  10. Address more review comments on commit 2d819a08a1.

  11. Fix unreachable code warning from commit 2d819a08a1.

  12. Introduce "builtin" collation provider.

  13. Catalog changes preparing for builtin collation provider.

  14. Unicode case mapping tables and functions.

  15. Add Unicode property tables.

  16. Documentation update for Standard Collations.

  17. Cleanup for unicode-update build target and test.

  18. Shrink Unicode category table.

  19. Make some error strings more generic

  20. pg_upgrade: copy locale and encoding information to new cluster.

  21. Update Unicode data to Unicode 15.0.0

  22. Create a new type category for "internal use" types.