The following bug has been logged on the website:
Bug reference: 12806
Logged by: Ugur YILMAZ
Email address: ugurlu2001(at)hotmail(dot)com
PostgreSQL version: 9.4.0
Operating system: Windows 7 Ultimate 64bit
Description:
I found this bug today and done a small research on web. I think that is a
bug and not only for me. You can see well explained details at the fallowing
link :
http://stackoverflow.com/questions/13029824/postgres-upper-function-on-turkish-character-does-not-return-expected-result
Warm regards,
Ugur