Date: Tue, 3 Nov 2020 23:14:42 +0100
From: Christoph Berg <myon@debian.org>
To: Thomas Munro <thomas.munro@gmail.com>
Cc: David Rowley <dgrowleyml@gmail.com>, Tom Lane <tgl@sss.pgh.pa.us>,
	Julien Rouhaud <rjuju123@gmail.com>,
	Peter Eisentraut <peter.eisentraut@2ndquadrant.com>,
	Michael Paquier <michael@paquier.xyz>,
	Robert Haas <robertmhaas@gmail.com>,
	Laurenz Albe <laurenz.albe@cybertec.at>,
	Douglas Doole <dougdoole@gmail.com>,
	Pg Hackers <pgsql-hackers@postgresql.org>,
	Juan =?iso-8859-1?Q?Jos=E9_Santamar=EDa?= Flecha
 <juanjo.santamaria@gmail.com>
Subject: Re: Collation versioning
Message-ID: <20201103221442.GA168711@msg.df7cb.de>
Mail-Followup-To: Christoph Berg <myon@debian.org>,
	Thomas Munro <thomas.munro@gmail.com>,
	David Rowley <dgrowleyml@gmail.com>, Tom Lane <tgl@sss.pgh.pa.us>,
	Julien Rouhaud <rjuju123@gmail.com>,
	Peter Eisentraut <peter.eisentraut@2ndquadrant.com>,
	Michael Paquier <michael@paquier.xyz>,
	Robert Haas <robertmhaas@gmail.com>,
	Laurenz Albe <laurenz.albe@cybertec.at>,
	Douglas Doole <dougdoole@gmail.com>,
	Pg Hackers <pgsql-hackers@postgresql.org>,
	Juan =?iso-8859-1?Q?Jos=E9_Santamar=EDa?= Flecha
 <juanjo.santamaria@gmail.com>
References: 
 <CAOBaU_a2s4kek+HELEkAa9Y5CA+W+2dS-e7F8K6BNWuh7=xaqg@mail.gmail.com>
 <CA+hUKGLWDWBL+79jNAz3oMofp1WDjQbBrmZTMe4E-b-MioQU0A@mail.gmail.com>
 <CAOBaU_ZYyxQ3sJR932NFs5HHh++RqXDGwe1S5ubBv8nmsHXCog@mail.gmail.com>
 <CA+hUKG+U_VV-7ZuJq0+sx5vwGYsUaeWSTxVUHc5ogeXJxJtAUw@mail.gmail.com>
 <686359.1604339499@sss.pgh.pa.us>
 <CA+hUKG+D8k_3GHX=0=Z53wDUaFGYu5RygA2tFn21KXR-K9j13g@mail.gmail.com>
 <CAApHDvpfOzs-tfm8wfiYg1zUZS0PDzNJG=rqnPHTfvks+G9ivg@mail.gmail.com>
 <CAApHDvq3FXpH268rt-6sD_Uhe7Ekv9RKXHFvpv==uh4c9OeHHQ@mail.gmail.com>
 <CA+hUKGKRDbQ9qGHt0SgE-1GbK+L6vAhCvBDQuA3naRXAQhhMyw@mail.gmail.com>
 <CA+hUKGKmcG6Khn7D59aDuUQkFLMvtN94SR2u_nBFMuRbPWWmXg@mail.gmail.com>
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: 
 <CA+hUKGKmcG6Khn7D59aDuUQkFLMvtN94SR2u_nBFMuRbPWWmXg@mail.gmail.com>
Precedence: bulk

Re: Thomas Munro
> for all I know, "en" variants might change
> independently (I doubt it in practice, but in theory it's wrong).

Long before the glibc 2.28 incident, the same collation change
had already happened twice, namely between RedHat 5 -> 6 -> 7, for
de_DE.UTF-8 only. de_AT.UTF-8 and all other locales were unaffected.

At the time I didn't connect the dots to check if Debian was affected
as well, but of course later testing revealed it was since it was a
change in glibc.

(German blogpost: https://www.credativ.de/blog/postgresql/postgresql-und-inkompatible-deutsche-spracheigenschaften-in-centos-rhel/)

Christoph