full-text search se chudno ponasa

[ivanhoe]

mysql mi jako chudno sortira rezultate full-text searcha, kao sto se moze videti iz prilozenog:

SELECT a3a.ID, a3a.Title,
MATCH (a3a.Title) AGAINST ('florida car insurance') AS relevance
FROM articles3 AS a3a
WHERE
MATCH (a3a.Title) AGAINST ('florida car insurance')
LIMIT 10

+--------+----------------------------------------+-----------------+
| ID     | Title                                  | relevance       |
+--------+----------------------------------------+-----------------+
| 193584 | Florida Health Insurance               | 10.545636177063 |
| 281813 | Florida Insurance Lawyers              | 10.545636177063 |
| 214760 | Florida Health Insurance               | 10.545636177063 |
| 210643 | Florida Car Insurance Requirements     | 10.545636177063 |
| 214756 | Florida Medical Insurance              | 10.545636177063 |
| 193583 | Florida Health Insurance Quote         |  10.42969417572 |

znaci rezultat koji sadzi sve 3 trazene reci ima isti relevance kao nalsov koji sadrzi samo 2 od 3 reci. Ovo sam probao na 2 servera na kojima stavljen mysql 4.1.20 i na oba s eidenticno ponasa...

Takodje postoji i nesto cudno oko boolean searcha, jer:

mysql> SELECT a3a.ID, a3a.Title
    -> FROM articles3 AS a3a
    -> WHERE
    -> MATCH (a3a.Title) AGAINST ('+florida +car +insurance' IN BOOLEAN MODE)
    -> LIMIT 10;
+--------+------------------------------------------------------------------------+
| ID     | Title                                                                  |
+--------+------------------------------------------------------------------------+
| 193582 | Florida Group Health Insurance                                         |
| 193583 | Florida Health Insurance Quote                                         |
| 193584 | Florida Health Insurance                                               |
| 193585 | Florida Individual Health Insurance                                    |
| 193586 | Florida Small Business Health Insurance                                |
| 193587 | Florida State Health Insurance                                         |
| 193632 | Affordable Florida Health Insurance                                    |
| 193716 | An Overview of Health Insurance Coverage for Individuals in Florida    |
| 193828 | Regulations Concerning Long Term Care Insurance in Florida             |
| 194058 | Florida Flood Insurance:  How Residents Can Obtain and Benefit from It |
+--------+------------------------------------------------------------------------+
10 rows in set (0.04 sec)

znaci iako ima pluseve ipred svih reci on ipak vrati i recorde koij ne sadrze "car" u sebi, iako u mysql manualu lepo pise:

A leading plus sign indicates that this word must be present in each row that is returned.

opet, ovo je probano na 2 servera (mysql 4.1.20) znaci nije problem u ostecenim indexima ili tako nesto, negoje neki bug u fulltext searchu...

jel zna neko slucajno isplati li se da upgradujem mysql na 5-cu, da li tamo full-text search radi bolje?