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From Ian Lea <ian....@gmail.com>
Subject Re: Different ranking results
Date Thu, 22 Jul 2010 10:34:11 GMT
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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