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From Benson Margulies <bimargul...@gmail.com>
Subject Re: DisjunctionMaxQuery and scoring
Date Fri, 20 Apr 2012 11:16:20 GMT
Uwe and Robert,

Thanks. David and I are two peas in one pod here at Basis.

--benson

On Fri, Apr 20, 2012 at 2:33 AM, Uwe Schindler <uwe@thetaphi.de> wrote:
> Hi,
>
> Ah sorry, I misunderstood, you wanted to score the duplicate match lower! To
> achieve this, you have to change the coord function in your
> similarity/BooleanWeight used for this query.
>
> Either way: If you want a group of terms that get only one score if at least
> one of the terms match (SQL IN), but not add them at all,
> DisjunctionMaxQuery is fine. I think this is what Benson asked for.
>
> -----
> Uwe Schindler
> H.-H.-Meier-Allee 63, D-28213 Bremen
> http://www.thetaphi.de
> eMail: uwe@thetaphi.de
>
>
>> -----Original Message-----
>> From: Uwe Schindler [mailto:uwe@thetaphi.de]
>> Sent: Friday, April 20, 2012 8:16 AM
>> To: java-user@lucene.apache.org; david_murgatroyd@hotmail.com
>> Subject: RE: DisjunctionMaxQuery and scoring
>>
>> Hi,
>> > I think
>> >  BooleanQuery bq = new BooleanQuery(false); doesn't quite accomplish
>> > the desired "name IN (dick, rich)" scoring behavior. This is because
>> (name:dick |
>> > name:rich) with coord=false would score the 'document' "Dick Rich"
>> > higher than "Rich" because the former has two term matches and the
>> > latter only
>> one.
>> > In contrast, I think the desire is that one and only one of the terms
>> > in
>> the
>> > document match those in the BooleanQuery so that "Rich" would score
>> > higher than "Dick Rich", given document length normalization. It's
>> > almost like a
>> desire
>> > for BooleanQuery bq = new BooleanQuery(false);
>> >   bq.set*Maximum*NumberShouldMatch(1);
>>
>> I that case DisjunctionMaxQuery is the way to go (it will only count the
> hit with
>> highest score and not add scores (coord or not coord doesn't matter here).
>>
>>
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>
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