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From Philippe <mailer.tho...@gmail.com>
Subject Re: Different ranking results
Date Thu, 22 Jul 2010 12:20:40 GMT
Well,

that's difficult at the moment as I can also just reproduce this error 
for some few cases. But I will try to generate such an example..

Cheers,
     Philippe

Am 22.07.2010 12:34, schrieb Ian Lea:
> No, I don't have an explanation.  Perhaps a minimal self-contained
> program or test case would help.
>
>
> --
> Ian.
>
>
> On Thu, Jul 22, 2010 at 10:23 AM, Philippe<mailer.thomas@gmail.com>  wrote:
>    
>> Hi Ian,
>>
>> I'm using Version 2.93 of lucene.
>>
>> q.getClass() and q.toString() are exactly equal:
>> org.apache.lucene.search.BooleanQuery
>> TITLE:672 BOOK:672
>>
>> However, the results for searcher.explain(q,n) significantly differ. It
>> seems to me that  "Query q = parser.parse("672");" searches only one the
>> Book field, whereas  "Query q = parser.parse("TITLE:672 BOOK:672");"
>> searches on both fields. Do you have a explanation for this behaviour? I
>> only observed this problem for this field...
>>
>> I appended the result of both explain strings below:
>>
>> "Query q = parser.parse("672");"
>> 9.987344E10 = (MATCH) sum of:
>>   9.987344E10 = (MATCH) weight(BOOK:672 in 7078), product of:
>>     0.6583703 = queryWeight(BOOK:672), product of:
>>       6.085349 = idf(docFreq=109, maxDocs=17780)
>>       0.10818941 = queryNorm
>>     1.51697965E11 = (MATCH) fieldWeight(BOOK:672 in 7078), product of:
>>       3.3166249 = tf(termFreq(BOOK:672)=11)
>>       6.085349 = idf(docFreq=109, maxDocs=17780)
>>       7.5161928E9 = fieldNorm(field=BOOK, doc=7078)
>>
>>
>> "Query q = parser.parse("TITLE:672 BOOK:672");"
>> 9.5225594E10 = (MATCH) sum of:
>>   9.5225594E10 = (MATCH) weight(BOOK:672 in 4979), product of:
>>     0.6583703 = queryWeight(BOOK:672), product of:
>>       6.085349 = idf(docFreq=109, maxDocs=17780)
>>       0.10818941 = queryNorm
>>     1.44638345E11 = (MATCH) fieldWeight(BOOK:672 in 4979), product of:
>>       3.1622777 = tf(termFreq(BOOK:672)=10)
>>       6.085349 = idf(docFreq=109, maxDocs=17780)
>>       7.5161928E9 = fieldNorm(field=BOOK, doc=4979)
>>   52.366344 = (MATCH) weight(TITLE:672 in 4979), product of:
>>     0.7526941 = queryWeight(TITLE:672), product of:
>>       6.957188 = idf(docFreq=45, maxDocs=17780)
>>       0.10818941 = queryNorm
>>     69.571884 = (MATCH) fieldWeight(TITLE:672 in 4979), product of:
>>       1.0 = tf(termFreq(TITLE:672)=1)
>>       6.957188 = idf(docFreq=45, maxDocs=17780)
>>       10.0 = fieldNorm(field=TITLE, doc=4979)
>>
>> Cheers,
>>     P.
>> Am 22.07.2010 10:02, schrieb Ian Lea:
>>      
>>> They look the same to me too.
>>>
>>> What does q.getClass().getName() say in each case? q.toString()?
>>> searcher.explain(q, n)?
>>>
>>> What version of lucene?
>>>
>>>
>>> --
>>> Ian.
>>>
>>>
>>>
>>>
>>> On Wed, Jul 21, 2010 at 10:25 PM, Philippe<mailer.thomas@gmail.com>
>>>   wrote:
>>>
>>>        
>>>> Hi,
>>>>
>>>> I just performed two queries which, in my opinion, should lead to the
>>>> same
>>>> document rankings. However, the document ranking differ between these two
>>>> queries. For better understanding I prepared  minimal examples for both
>>>> queries. In my understanding both queries perform the same task. Namely
>>>> search for "lucene" in two different fields.
>>>>
>>>> Maybe someone can explain me my misunderstanding?
>>>>
>>>>
>>>> String[] fields = {"TITLE", "BOOK"};
>>>> MultiFieldQueryParser parser = new
>>>> MultiFieldQueryParser(Version.LUCENE_29,
>>>> fields, new StandardAnalyzer(Version.LUCENE_29));
>>>>
>>>> 1.)
>>>> Query q = parser.parse("lucene");
>>>>
>>>> 2.)
>>>> Query q = parser.parse(TITLE:lucene OR BOOK:lucene);
>>>>
>>>> Regards,
>>>>     philippe
>>>>
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>>>>
>>>>
>>>>
>>>>          
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>>>
>>>
>>>        
>>
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>>
>>
>>      
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>
>    


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