Horton

Re: Built-in CTYPE provider

Jeremy Schneider <schneider@ardentperf.com>

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From: Jeremy Schneider <schneider@ardentperf.com>
To: Laurenz Albe <laurenz.albe@cybertec.at>
Cc: Daniel Verite <daniel@manitou-mail.org>, Jeff Davis <pgsql@j-davis.com>, Noah Misch <noah@leadboat.com>, Peter Eisentraut <peter@eisentraut.org>, Robert Haas <robertmhaas@gmail.com>, Tom Lane <tgl@sss.pgh.pa.us>, pgsql-hackers@postgresql.org
Date: 2024-07-09T14:51:39Z
Lists: pgsql-hackers 
On Tue, Jul 9, 2024 at 4:00 AM Laurenz Albe <laurenz.albe@cybertec.at>
wrote:

>
> My personal exprience is that very few users are aware of or care about
> the strict accuracy of the collation sort order and other locale aspects.
> But they care a lot about index corruption.
>
> So I'd argue that we should not have any breaking changes at all, even in
> cases where the provider is clearly wrong.



FWIW, using external ICU libraries is a nice solution for users who need
strict and up-to-date Unicode support.

Cell phones do often get support for new code points before databases. So
databases can end up storing characters before they are aware of the
meaning. (Slide 27 in the pgconf.dev talk illustrates a recent timeline of
Unicode & phone updates.)

-Jeremy

>

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.