Bug in LIKE operator processing

I've found that statement:
SELECT * FROM os WHERE 'FreeBSD 4.7-RC'     LIKE string_id; (one of string_id's is 'FreeBSD 4.7%')

doesn't work. No error is reported. It does work in Oracle,
so I think it's a standard SQL query.

Table is defined as:

host=> \d os                                   Table "os" Column   |         Type          |
Modifiers                   
-----------+-----------------------+-----------------------------------------------id        | integer               |
notnull default nextval('"os_id_seq"'::text)name      | character varying(32) | major     | integer               |
minor    | integer               | subrev    | character(16)         | string_id | character(32)         |  
Unique keys: os_id_key

PostgreSQL version is 7.3.1

Is it non-implemented by design, or maybe I've overlooked something?

Thanks, /S