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From fulin tang <>
Subject Re: Is it a lucene bug?
Date Fri, 27 Nov 2009 02:00:22 GMT
Maybe you should take a look at the  Scorer  and  Similarity  series
classes , they will show you how the score is calculated , make some
change of them, and you will get what you want.

We have the same problem and we get it done by write subclasses of
DefaultSimilarity and BooleanScorer

2009/11/26 Uwe Schindler <>:
> Read the documentation of the Document class: if you set a boost for a
> document, it is used when indexing the fields and multiplied to each field.
> For the document itself no boost value is stored, so you cannot get it (only
> so called stored fields are retrievable).
> -----
> Uwe Schindler
> H.-H.-Meier-Allee 63, D-28213 Bremen
> eMail:
>> -----Original Message-----
>> From: Wilson Wu []
>> Sent: Thursday, November 26, 2009 1:01 PM
>> To:
>> Subject: Is it a lucene bug?
>> Hi,
>>      Recently, there is a requirement to sort the hits by both the
>> scores of documents and the updateTime which is a field of document to
>> mark the document's update time.  We want the new document in the
>> front and also want high score document in the front,in other words,
>> we want to mix the score and updateTime, but not first sort by
>> one,second by the other. So, I design a time based function f(t) to
>> calculte each document boost to write into the index store.
>>       The result is that I can caculate a value for each document
>> based its update time, and the value can influence the document score
>> through adjusting the fieldNorm value. But when I lookup the boost
>> value through the method document.getBoost() from every document in
>> the index store, I found the boost value = 1.0. Which means I can set
>> a document's boost value and the boost value can adjust the final
>> score, but I can't read the boost value from the document I have
>> searched out.
>>     Is it a bug in lucene? Thanks. I use lucene version 2.4.1.
>>     PS: Is there any other way to meet my reqirement?  I think it is
>> not a good idea to adjust document's final score through writing a
>> document boost into the index store. Because if I want to open two
>> interfaces to the Client: one is sorting documents only by score which
>> is just the similarity score and has not been adjusted by boost value
>> f(t), the other is sorting by final score which has been adjuested by
>> boost value f(t). Thank a lot!
>>                                                wilson
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