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Re: ICU for global collation

Daniel Verite <daniel@manitou-mail.org>

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From: "Daniel Verite" <daniel@manitou-mail.org>
To: "Julien Rouhaud" <rjuju123@gmail.com>
Cc: Peter Eisentraut <peter.eisentraut@enterprisedb.com>, Pgsql-Hackers <pgsql-hackers@postgresql.org>
Date: 2022-01-10T14:45:47Z
Lists: pgsql-hackers 
	Julien Rouhaud wrote:

> > The lack of these fields overall suggest the idea that when CREATE
> > DATABASE is called with a global ICU collation, what if it somehow
> > inserted the collation into pg_collation in the new database?
> > Then pg_database would just store the collation oid and no other
> > collation-related field would need to be added into it, now
> > or in the future.
> 
> I don't think it would be doable given the single-database-per-backend
> restriction.

By that I understand that CREATE DATABASE is limited to copying a template
database and then not write anything into it beyond that, as it's
not even connected to it.
I guess there's still the possibility of requiring that the ICU db-wide
collation of the new database does exist in the template database,
and then the CREATE DATABASE would refer to that collation instead of
an independent locale string.


Best regards,
-- 
Daniel Vérité
PostgreSQL-powered mailer: https://www.manitou-mail.org
Twitter: @DanielVerite

Commits

Same data as JSON: GET /api/v1/messages/:b64id/commits the thread's linked commits as JSON, with link sources. API reference →

  1. Add CHECK_FOR_INTERRUPTS while restoring changes during decoding.

  2. Improve ICU option handling in CREATE DATABASE

  3. Don't allow creation of database with ICU locale with unsupported encoding

  4. Make locale option behavior more consistent

  5. pg_dump: Dump colliculocale

  6. Remove further unwanted linker flags from perl_embed_ldflags

  7. Doc: document possible need to raise kernel's somaxconn limit.

  8. Reduce warnings with -Wshadow=compatible-local builds

  9. Remove redundant spaces in _outA_Expr() output

  10. Fix outdated --help message for postgres -f

  11. pg_upgrade: Fix version comparison for global ICU support

  12. Silence -Wmaybe-uninitialized compiler warning in dbcommands.c.

  13. Add option to use ICU as global locale provider

  14. DefineCollation() code cleanup

  15. Change collate and ctype fields to type text

  16. Call pg_newlocale_from_collation() also with default collation

  17. Use libc version as a collation version on glibc systems.

  18. Silence -Wmaybe-uninitialized compiler warnings in dbcommands.c.

  19. Make LC_COLLATE and LC_CTYPE database-level settings. Collation and