Horton

Re: Built-in CTYPE provider

Jeff Davis <pgsql@j-davis.com>

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From: Jeff Davis <pgsql@j-davis.com>
To: Peter Eisentraut <peter@eisentraut.org>, Daniel Verite <daniel@manitou-mail.org>
Cc: Robert Haas <robertmhaas@gmail.com>, Jeremy Schneider <schneider@ardentperf.com>, pgsql-hackers@postgresql.org
Date: 2024-03-14T20:42:28Z
Lists: pgsql-hackers 
On Thu, 2024-03-14 at 15:38 +0100, Peter Eisentraut wrote:
> On 14.03.24 09:08, Jeff Davis wrote:
> > 0001 (the C.UTF-8 locale) is also close...
> 
> If have tested this against the libc locale C.utf8 that was available
> on 
> the OS, and the behavior is consistent.

That was the goal, in spirit.

But to clarify: it's not guaranteed that the built-in C.UTF-8 is always
the same as the libc UTF-8, because different implementations do
different things. For instance, I saw significant differences on MacOS.

> I wonder if we should version the builtin locales too.  We might make
> a 
> mistake and want to change something sometime?

I'm fine with that, see v25-0004 in the reply to your other mail.

The version only tracks sort order, and all of the builtin locales sort
based on memcmp(). But it's possible there are bugs in the
optimizations around memcmp() (e.g. abbreviated keys, or some future
optimization).

> Tiny comments:
> 
> * src/bin/scripts/t/020_createdb.pl
> 
> The two added tests should have different names that tells them apart
> (like the new initdb tests).
> 
> * src/include/catalog/pg_collation.dat

Done in v25-0002 (in reply to your other mail).

Regards,
	Jeff Davis

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.