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From: Grant Ingersoll <gsingers@apache.org>
To: java-user@lucene.apache.org
In-Reply-To: <594203920811252047s5c4d5fb4n555e93413219f70e@mail.gmail.com>
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Subject: Re: calculating score - implementing your own 'Scorer' - how to?..
Date: Fri, 28 Nov 2008 07:42:31 -0500
References: <594203920811252047s5c4d5fb4n555e93413219f70e@mail.gmail.com>

Hi Vlad,

I believe you can achieve this using the function package (i.e.  
Function Queries, org.apache.lucene.search.function).    The other  
thing that comes to mind is, if you don't truly need the bit mask for  
other things, is to encode it into the Field as a boost value.  This  
may be complicated by the lack of granularity in boost encoding, but  
it might work for you.

-Grant


On Nov 25, 2008, at 11:47 PM, Vlad Olenin wrote:

> Hi,
>
> I'm new to Lucene, so looking for some guidance as to the most  
> efficient /
> appropriate way to implement the following functionality.
>
>
> * Each Document consists of a number of fields
> * Each Field value, when indexed, can have different 'score' value
> associated with it
> ** for simplicity, the score is presented as a bit mask
> ** each field value might have different score for the same field
> ** each field value might have different score for the different  
> fields
> *** eg, if doc1.field1.value = "val1, val2, val3", then index over  
> field1
> might have different score values associated with each value (here are
> {docId.field, score} pairs):
> ***       val1 = {doc1.field1, '0011'},
> ***       val2 = {doc1.field1, '0101'},
> ***       val3 = {doc1.field1, '1011'}
> * when the search is done, the final score for the document must be
> calculated based on the bit combination of scores, eg:
> ** query = 'val1, val2', res = {doc1, '0001'}  (0011 & 0101)
> ** query = 'val1, val3', res = {doc1, '0011'}  (0011 & 1011)
>
>
> How do I implement the above scoring logic? Thanks,
>
> Vlad


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