public inbox for [email protected]  

help / color / mirror / Atom feed

From: Regina Obe <[email protected]>
To: 'Tom Lane' <[email protected]>
To: 'Peter Eisentraut' <[email protected]>
Cc: 'Sandro Santilli' <[email protected]>
Cc: [email protected]
Cc: 'Jeff Davis' <[email protected]>
Subject: RE: Order changes in PG16 since ICU introduction
Date: Fri, 21 Apr 2023 13:37:25 -0400
Message-ID: <[email protected]> (raw)
In-Reply-To: <[email protected]>
References: <[email protected]>
	<[email protected]>
	<[email protected]>
	<[email protected]>
	<[email protected]>

> Peter Eisentraut <[email protected]> writes:
> > If the database is created with locale provider ICU, then lc_collate
> > does not apply here, so the result might be correct (depending on what
> > locale you have set).
> 
> FWIW, an installation created under LANG=C defaults to ICU locale en-US-u-
> va-posix for me (see psql \l), and that still sorts as expected on my
RHEL8 box.
> We've not seen buildfarm problems either.
> 
> I am wondering however whether this doesn't mean that all our carefully
> coded fast paths for C locale just went down the drain.  Does the ICU code
> have any of that?  Has any performance testing been done to see what
impact
> this change had on C-locale installations?  (The current code coverage
report
> for pg_locale.c is not encouraging.)
> 
> 			regards, tom lane

Just  another metric.

On my mingw64 setup, I built a test database on PG16 (built with icu
support) and PG15 (no icu support)

CREATE DATABASE test TEMPLATE=template0 ENCODING = 'UTF8' LC_COLLATE = 'C'
LC_CTYPE = 'C';

I think the above is the similar setup we have when testing.

On PG15 

SELECT '+' <  '-' ;  returns true

On PG 16 returns false

For PG 16, to strk's point, you have to do: to get a true
SELECT '+' COLLATE "C" <  '-'  COLLATE "C";


I would expect since I'm initializing my db in collate C they would both
behave the same

view thread (45+ messages)  latest in thread

reply

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Reply to all the recipients using the --to and --cc options:
  reply via email

  To: [email protected]
  Cc: [email protected], [email protected], [email protected], [email protected], [email protected], [email protected]
  Subject: RE: Order changes in PG16 since ICU introduction
  In-Reply-To: <[email protected]>

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

This inbox is served by agora; see mirroring instructions
for how to clone and mirror all data and code used for this inbox