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Date: Thu, 19 Apr 2012 20:32:21 -0400
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 <CAKyW2aCVFaHA8KJ=xF_cy-RG1dfwK7NTrEn792Tt7bukCHh9Pw@mail.gmail.com>
Subject: Re: DisjunctionMaxQuery and scoring
From: David Murgatroyd <dmurga@gmail.com>
To: java-user@lucene.apache.org
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[apologies for the earlier errant send]

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);

Is there a good way to accomplish this?

On Thu, Apr 19, 2012 at 7:37 PM, Robert Muir <rcmuir@gmail.com> wrote:

> On Thu, Apr 19, 2012 at 6:36 PM, Benson Margulies <bimargulies@gmail.com>
> wrote:
> > I see why I'm so confused, but I think I need to construct a simpler
> test case.
> >
> > My top-level BooleanQuery, which has disableCoord=false, has 22
> > clauses. All but three are ordinary SHOULD TermQueries. the remainder
> > are a spanNear and a nested BooleanQuery, and an empty PhraseQuery
> > (that's a bug).
> >
> > However, at the end of the explain trace, I see:
> >
> > 0.45 = coord(9/20) I think that my nested Boolean, for which I've been
> > flipping coord on and off to see what happens, is somehow not
> > participating at all. So switching it's coord on and off has no
> > effect.
> >
> > Why 20? Why not 22? Is this just an explain quirk?
>
> I am not sure (also not sure i understand your example totally), but
> at the same time could be as simple as the fact you have 2 prohibited
> (MUST_NOT) clauses. These don't count towards coord()
>
> I think its hard to tell from your description (just since it doesn't
> have all the details). an explain or test case or something like that
> would might be more efficient if its still not making sense...
>
> --
> lucidimagination.com
>
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