Re: Inconsistent results with libc sorting on Windows - Mailing list pgsql-hackers

On Fri, Aug 11, 2023 at 11:48:18AM +0200, Juan José Santamaría Flecha wrote:
> On Fri, Aug 11, 2023 at 7:29 AM Noah Misch <noah@leadboat.com> wrote:
> 
> >
> > The LCMapStringEx() solution is elegant.  I do see
> >
> > https://learn.microsoft.com/en-us/windows/win32/intl/handling-sorting-in-your-applications
> > says, "If an application calls the function to create a sort key for a
> > string
> > containing an Arabic kashida, the function creates no sort key value."
> > That's
> > aggravating.
> >
> 
> I think the problem there is that it is just poorly explained.
> Take for example the attached program that compares "normal" and "kashida"
> 'Raħīm' taken from [1], you'll get:
> 
> c1 = c2
> c2 = c1
> 
> meaning that "normal" and "kashida" are the same string. So, probably that
> phrase should read something like: "If an application calls the function to
> create a sort key for a string containing an Arabic kashida character, the
> function will ignore that character and no sort key value will be generated
> for it."

Good.  That sounds fine.  Thanks for clarifying.