"PostgreSQL Bugs List" <pgsql-bugs(at)postgresql(dot)org> writes:
> Description: Two different Unicode chars are treated as equal in a
> query
This would be a matter to take up with the maintainer of your locale
(which you didn't mention, but in any case it's a locale bug). We
just do what strcoll() tells us.
Note that it's possible this is a configuration error and not an
outright bug. Check to make sure that the locale you initdb'd
under is actually designed to work with UTF-8 data.
regards, tom lane