[Xapian-discuss] Search relevance

[Ben Phillips]

I'm getting some surprising (to me) ordering of results. An example below:

Query string is: grand theft auto four
Parsed query is: Xapian::Query((Zgrand:(pos=1) OR Ztheft:(pos=2) OR
Zauto:(pos=3) OR Zfour:(pos=4) OR 4:(pos=4) OR IV:(pos=4)))
528 results found.
Results 1-10:
1: 46% ID=51009 TITLE= docid=36694 [Grand Theft Auto Compilation]
['XID51009', 'XPLATFORM16', 'Zauto', 'Zcollector', 'Zcompil', 'Zedit',
'Zgrand', 'Ztheft', 'auto', "collector's", 'compilation', 'edition',
'grand', 'theft']
2: 40% ID=6609 TITLE= docid=6569 [Grand Theft Auto Advance]
['XID6609', 'XPLATFORM4', 'Zadvanc', 'Zauto', 'Zgrand', 'Ztheft',
'advance', 'auto', 'grand', 'theft']
3: 40% ID=6614 TITLE= docid=6574 [Grand Theft Auto London 1961]
['1961', 'XID6614', 'XPLATFORM15', 'Zauto', 'Zgrand', 'Zlondon',
'Ztheft', 'auto', 'grand', 'london', 'theft']
4: 39% ID=6607 TITLE= docid=6567 [Grand Theft Auto]
['XID6607', 'XPLATFORM15', 'XPLATFORM16', 'XPLATFORM22', 'Zauto',
'Zgrand', 'Ztheft', 'auto', 'grand', 'theft']
5: 39% ID=24402 TITLE= docid=21668 [Grand Theft Auto IV]
['XID24402', 'XPLATFORM34', 'XPLATFORM69', 'Zauto', 'Zgrand', 'Ziv',
'Ztheft', 'auto', 'grand', 'iv', 'theft']

four has synonyms so expands to four OR 4 OR IV. I'd expect result 5
'Grand Theft Auto IV' to be result number 1 as it's exactly the search
term. If I search for 'grand theft auto iv' then it is result 1.

Cheers,
Ben.

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