Horton

Re: Built-in CTYPE provider

Daniel Verite <daniel@manitou-mail.org>

View thread View on postgr.es
From: "Daniel Verite" <daniel@manitou-mail.org>
To: "Jeff Davis" <pgsql@j-davis.com>
Cc: Robert Haas <robertmhaas@gmail.com>, Jeremy Schneider <schneider@ardentperf.com>, pgsql-hackers@postgresql.org
Date: 2024-01-12T18:00:28Z
Lists: pgsql-hackers 
	Jeff Davis wrote:

> > Jeremy also raised a problem with old versions of psql connecting to
> > a
> > new server: the \l and \dO won't work. Not sure exactly what to do
> > there, but I could work around it by adding a new field rather than
> > renaming (though that's not ideal).
> 
> I did a bit of research for a precedent, and the closest I could find
> is that \dp was broken between 14 and 15 by commit 07eee5a0dc.

Another one is that version 12 broke \d in older psql by
removing pg_class.relhasoids.

ISTM that in general the behavior of old psql vs new server does
not weight much against choosing optimal catalog changes.

There's also that warning at start informing users about it:
WARNING: psql major version X, server major version Y.
	 Some psql features might not work.


Best regards,
-- 
Daniel Vérité
https://postgresql.verite.pro/
Twitter: @DanielVerite

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.