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Bug 36 - Fuzzy title search doesn't match substrings of titles


Summary:	Fuzzy title search doesn't match substrings of titles

Status:	RESOLVED FIXED

Product:	MediaWiki
Classification:	Unclassified
Component:	General/Unknown (Other open bugs)
Version:	unspecified
Hardware:	All All

Importance:	Normal normal (vote)
Target Milestone:	---
Assigned To:	Nobody - You can work on this!

URL:
Whiteboard:
Keywords:

Depends on:
Blocks:
	Show dependency tree / graph

Reported:	2004-08-14 06:44 UTC by Timwi
Modified:	2012-04-24 01:57 UTC (History)
CC List:	2 users (show)

See Also:
Web browser:	---
Mobile Platform:	---
Assignee Huggle Beta Tester:	---

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Description Timwi 2004-08-14 06:44:53 UTC

BUG MIGRATED FROM SOURCEFORGE
http://sourceforge.net/tracker/index.php?func=detail&aid=994574&group_id=34373&atid=411192
Originally submitted by Matt Kaufman (kaufman_matt)  2004-07-20 17:23


We have been using MediaWiki 1.3 on MySQL 3.x 
for about two weeks now and have noticed some 
strange search behavior with the search button.  

We have a two pages:
	"Migrating Old Code"
	"Migration"

When performing a search for "Migrating", the 
results are:
	Search results
	For query "migrating"
	No page with this exact title exists, trying 
full text search.
	Migration 77% (****) 

Nothing else is returned.  It says nothing about 
the "Migrating Old Code" page.  At first I thought 
there was an issue with MediaWiki not searching 
page titles, so I tried a few tests and it worked 
fine.  I also tried putting the word "Migrating" in 
the text of other pages to see if the search results 
(shown above) would change.  They did not...

-Matt

------------------------- Additional comments ------------------------
Date: 2004-08-05 08:44
Sender: SF user vibber

Is this still going on? Is this a public wiki we can poke at?
-------------------------------------------------
Date: 2004-08-06 17:30
Sender: SF user kaufman_matt

Sorry, it is not a public wiki.  It's still happenig even 
after upgrading to MySQL 4.
-------------------------------------------------
Date: 2004-08-10 21:38
Sender: SF user vibber

(Adjusting categorization of bug.)

Comment 1 Wil Mahan 2004-09-17 17:43:20 UTC

This only happens when $wgDisableFuzzySearch = false. Here's the problem:

We do a fuzzy title search on the word "Migrating". That takes all titles of
approximately the same length as "migrating", and returns all titles within a
certain Levenshtein distance of the word. Thus the "Migration" article shows up,
but since "Migrating Old Code" isn't about the same length as "migrating", it
isn't even considered.

I think we could either WONTFIX this bug, or modify the fuzzy title search to
also use another way of matching titles.

Comment 2 Brion Vibber 2004-09-21 20:24:32 UTC

Fuzzy title search is sufficiently problematic that I think we should just disable it by 
default.

It was originally intended to be a middle step between the exact title match ('go') 
and the much slower fulltext search on the title field; however we had more 
performance problems with it on Wikipedia and disabled it there. On a more general 
server it tends to return unexpected results and doesn't make it obvious how to do a 
normal search after that.

Comment 3 Brion Vibber 2004-10-28 02:30:02 UTC

Fuzzy search is being removed in 1.4.

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