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: 2024-04-01T19:52:31Z
Lists: pgsql-hackers

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On Tue, 2024-03-26 at 08:04 +0100, Peter Eisentraut wrote:
> The patch set v27 is ok with me, modulo (a) discussion about initcap 
> semantics, and (b) what collation to assign to ucs_basic, which can
> be 
> revisited later.

Attached v28.

The remaining patches are for full case mapping and PG_UNICODE_FAST. 

I am fine waiting until July to get these remaining patches committed.
That would give us time to sort out details like:

* Get consensus that it's OK to change UCS_BASIC.
* Figure out if we need a pg-specific locale and whether
PG_UNICODE_FAST is the right name.
* Make sure that full case mapping interacts with regexes in a sane way
(probably it needs to just fall back to simple case mapping, but
perhaps that's worth a discussion).
* Implement case folding.
* Implement a more unicode-friendly TITLECASE() function, which could
offer a number of options that don't fit well with INITCAP().
* Figure out if UPPER()/LOWER() should also have some of those options.

Thoughts?

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.