Re: Allow to_date() and to_timestamp() to accept localized names

On Fri, Jan 24, 2020 at 5:46 PM Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> wrote:

> Peter Eisentraut <peter(dot)eisentraut(at)2ndquadrant(dot)com> writes:
> > Looking through the patch quickly, if you want to get Unicode-fancy,
> > doing a case-insensitive comparison by running lower-case on both
> > strings is also wrong in corner cases. All the Greek month names end in
> > sigma, so I suspect that this patch might not work correctly in such
> cases.
>
> Hm. That's basically what citext does, and I don't recall hearing
> complaints about that. What other definition of "case insensitive"
> would you suggest?
>
>
To illustrate the issue, it does not work as expected:

postgres=# select lower(to_char(now(),'TMMONTH'));
lower
------------
ιανουάριοσ
(1 row)

postgres=# select to_char(now(),'TMmonth');
to_char
------------
ιανουάριος
(1 row)

Regards,

Juan José Santamaría Flecha