Horton
Menu

Re: ICU for global collation

Daniel Verite <daniel@manitou-mail.org>

View thread
From: "Daniel Verite" <daniel@manitou-mail.org>
To: "Peter Eisentraut" <peter.eisentraut@2ndquadrant.com>
Cc: "pgsql-hackers" <pgsql-hackers@postgresql.org>
Date: 2019-11-01T18:18:13Z
Lists: pgsql-hackers 
	Peter Eisentraut wrote:

> I looked into this problem.  The way to address this would be adding 
> proper collation support to the text search subsystem.  See the TODO 
> markers in src/backend/tsearch/ts_locale.c for starting points.  These 
> APIs spread out to a lot of places, so it will take some time to finish. 
>  In the meantime, I'm pausing this thread and will set the CF entry as RwF.

Even if the FTS code is improved in that matter, any extension code
with libc functions depending on LC_CTYPE is still going to be
potentially problematic. In particular when it happens to be set
to a different encoding than the database.

Couldn't we simply invent per-database GUC options, as in
ALTER DATABASE myicudb SET libc_lc_ctype TO 'value';
ALTER DATABASE myicudb SET libc_lc_collate TO 'value';

where libc_lc_ctype/libc_lc_collate would specifically set
the values in the LC_CTYPE and LC_COLLATE environment vars
of any backend serving the corresponding database"?


Best regards,
-- 
Daniel Vérité
PostgreSQL-powered mailer: http://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 Fix outdated --help message for postgres -f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