Re: Missing rows with index scan when collation is not "C" (PostgreSQL 9.5)

On Wed, Mar 23, 2016 at 12:19 PM, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> wrote:
> Robert Haas <robertmhaas(at)gmail(dot)com> writes:
>> I was a little worried that it was too much to hope for that all libc
>> vendors on earth would ship a strxfrm() implementation that was actually
>> consistent with strcoll(), and here we are.
>
> Indeed. To try to put some scope on the problem, I made an idiot little
> program that just generates some random UTF8 strings and sees whether
> strcoll and strxfrm sort them alike. Attached are that program, a even
> more idiot little shell script that runs it over all available UTF8
> locales, and the results on my RHEL6 box. While de_DE seems to be the
> worst-broken locale, it's far from the only one.
>
> Please try this on as many platforms as you can get hold of ...

Failed on Debian 8.2, but only for de_DE.utf8. libc 2.19-18+deb8u1. Attached.

--
Thomas Munro
http://www.enterprisedb.com