BUG #1908: sql support chinese char error

The following bug has been logged online:

Bug reference: 1908
Logged by: wally
Email address: wally(at)ideassoft(dot)com
PostgreSQL version: 8.0.3,8.0.2
Operating system: fc4,fc3,as4
Description: sql support chinese char error
Details:

when running the following sql clause,the result shoud be empty, but I get
one incorrect row.
if I use pgsql 7.4 running the same sql clause return correctly.
thanks!

ulike=# select group_name from group_info where group_name='';
group_name
------------

(1 row)

ulike=# select group_name from group_info ;
group_name
-------------
fFaf
asgfasf
hjlhjl
dfgdj


fdkfjwr
beijing2008
wws
dhdfj

(11 rows)