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Re: ICU for global collation

Julien Rouhaud <rjuju123@gmail.com>

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From: Julien Rouhaud <rjuju123@gmail.com>
To: "Finnerty, Jim" <jfinnert@amazon.com>
Cc: Peter Eisentraut <peter.eisentraut@enterprisedb.com>, pgsql-hackers <pgsql-hackers@postgresql.org>, Daniel Verite <daniel@manitou-mail.org>
Date: 2022-01-18T03:47:13Z
Lists: pgsql-hackers 
Hi,

On Mon, Jan 17, 2022 at 07:07:38PM +0000, Finnerty, Jim wrote:
>     On 10.01.22 12:49, Daniel Verite wrote:
> 
> > I think some users would want their db-wide ICU collation to be
> > case/accent-insensitive. 
> ...
> > IIRC, that was the context for some questions where people were
> > enquiring about db-wide ICU collations.
> 
> +1.  There is the DEFAULT_COLLATION_OID, which is the cluster-level default
> collation, a.k.a. the "global collation", as distinct from the "db-wide"
> database-level default collation, which controls the default type of the
> collatable types within that database.

There's no cluster-level default collation, and DEFAULT_COLLATION_OID is always
database-level (and template1 having a specific default collation).  The
template0 database is there to be able to support different databases with
different default collations, among other things.

So this patchset would allow per-database default ICU collation, although not
non-deterministic ones.

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 Fix outdated --help message for postgres -f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