Re: pg_trgm

> I think the problem at hand has nothing at all to do with agglutination
> or CJK-specific issues.  You will get the same problem with other
> languages *if* you set a locale that does not adequately support the
> characters in use.  E.g., Russian with locale C and encoding UTF8:
> 
> select similarity(E'\u0441\u043B\u043E\u043D', E'\u0441\u043B\u043E
> \u043D\u044B');
>  similarity
> ────────────
>         NaN
> (1 row)

Wait. This works fine for me with stock pg_trgm. local is C and
encoding is UTF8. What version of PostgreSQL are you using? Mine is
8.4.4.
--
Tatsuo Ishii
SRA OSS, Inc. Japan
English: http://www.sraoss.co.jp/index_en.php
Japanese: http://www.sraoss.co.jp