Horton

Re: Built-in CTYPE provider

Robert Haas <robertmhaas@gmail.com>

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From: Robert Haas <robertmhaas@gmail.com>
To: Jeff Davis <pgsql@j-davis.com>
Cc: Jeremy Schneider <schneider@ardentperf.com>, pgsql-hackers@postgresql.org
Date: 2023-12-19T20:59:03Z
Lists: pgsql-hackers 
On Mon, Dec 18, 2023 at 2:46 PM Jeff Davis <pgsql@j-davis.com> wrote:
> The whole concept of "providers" is that they aren't consistent with
> each other. ICU, libc, and the builtin provider will all be based on
> different versions of Unicode. That's by design.
>
> The built-in provider will be a bit better in the sense that it's
> consistent with the normalization functions, and the other providers
> aren't.

FWIW, the idea that we're going to develop a built-in provider seems
to be solid, for the reasons Jeff mentions: it can be stable, and
under our control. But it seems like we might need built-in providers
for everything rather than just CTYPE to get those advantages, and I
fear we'll get sucked into needing a lot of tailoring rather than just
being able to get by with one "vanilla" implementation.

-- 
Robert Haas
EDB: http://www.enterprisedb.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.