Julius Tuskenis  wrote:
 
> I've made a function that converts lithuanian letters to latin and
> use it like fnk_latin(username) ILIKE fnk_latin('kestas').
 
> Now the problem is performance.
 
> Maybe some special index would help?
 
create index tblname_username_latin on tblname
((fnk_latin(username)));
 
You might want to have that function force all letters to lowercase. 
It might also help to specify varchar_pattern_ops.

-Kevin

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