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From: "Uwe Schindler" <uwe@thetaphi.de>
To: <java-user@lucene.apache.org>
References: <27684388.post@talk.nabble.com>
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Subject: RE: Boost Problem (again), need example !
Date: Mon, 22 Feb 2010 12:35:07 +0100
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The simple fix for that is to wrap the subQuery using: new =
ConstantScoreQuery(new QueryWrapperFilter(query)) - after that its score =
is constant and the ValueSource only scores.

I recommend to use NumericField for indexing this boost (no storing =
needed, only indexing, precisionStep=3DInteger.MAX_VALUE). Else (if =
using standard Field) the boost field does not need to be "stored", it =
must be indexed as NOT_ANALYZED.=20

-----
Uwe Schindler
H.-H.-Meier-Allee 63, D-28213 Bremen
http://www.thetaphi.de
eMail: uwe@thetaphi.de


> -----Original Message-----
> From: Ian Lea [mailto:ian.lea@gmail.com]
> Sent: Monday, February 22, 2010 12:26 PM
> To: java-user@lucene.apache.org
> Subject: Re: Boost Problem (again), need example !
>=20
> boostField needs to be indexed to be used in the FieldScoreQuery.
>=20
> Are you now using one of the the latest releases that Uwe mentioned,
> with fixes for CustomScoreQuery?
>=20
> And unless you provide your own implementation of
> CustomScoreQuery.customScore() I think that you are still not
> guaranteed to get what you want since the default implementation is to
> calculate the score as subQueryScore * valSrcScore.
>=20
>=20
> --
> Ian.
>=20
>=20
> On Mon, Feb 22, 2010 at 11:00 AM, pdaures <patrick.daures@gmail.com>
> wrote:
> >
> > HI !
> > Thank you for your help.
> > I think I don't use CustomScoreQuery correctly when I do a "search".
> >
> > BooleanQuery combinedQuery =3D new BooleanQuery();
> > combinedQuery.add(textQuery, Occur.MUST);
> > combinedQuery.add(titleQuery, Occur.MUST);
> >
> > CustomScoreQuery customQuery =3D new =
CustomScoreQuery(combinedQuery,new
> > FieldScoreQuery(BOOST_FIELD,Type.INT));
> >
> > indexSearcher.search(..., customQuery, ....).
> >
> > in order to index the BOOST_FIELD, I do that :
> > Field boostField =3D new Field(BOOST_FIELD, Integer.toString(boost),
> > Field.Store.YES, Field.Index.ANALYZED.NO);
> >
> >
> > Is that correct ?
> > Thank you
> >
> >
> >
> >
> > Uwe Schindler wrote:
> >>
> >> It's CustomScoreQuery in 2.9 and 3.0.
> >>
> >> Please wait for 2.9.2 and 3.0.1 for an important API change in this
> >> experimental query type to work correct with the new per-segment-
> search!
> >> You can test the release artifacts of both new versions here:
> >> http://people.apache.org/~uschindler/staging-area/lucene-292-301-
> take2-rev912433/
> >>
> >> With e.g. ValueSourceQuery you can score your documents using a
> separate
> >> numeric field from your documents (it uses FieldCache).
> >>
> >> Uwe
> >>
> >> -----
> >> Uwe Schindler
> >> H.-H.-Meier-Allee 63, D-28213 Bremen
> >> http://www.thetaphi.de
> >> eMail: uwe@thetaphi.de
> >>
> >>> -----Original Message-----
> >>> From: Ian Lea [mailto:ian.lea@gmail.com]
> >>> Sent: Monday, February 22, 2010 10:33 AM
> >>> To: java-user@lucene.apache.org
> >>> Subject: Re: Boost Problem (again), need example !
> >>>
> >>> Can't you simply sort by descending score (your score, not
> lucene's)?
> >>> Seems to me that would give you what you are asking for.
> >>>
> >>> The setBoost() method is unlikely to work consistently because it
> only
> >>> infuences the score rather than setting it.  If your John Mickeal
> doc
> >>> happens to have a higher lucene score, because of the normal
> >>> idf/tf/etc stuff, then the setBoost() with a higher value for John
> >>> Smith may well not be enough to force John Smith to the top.
> >>>
> >>> I don't know enough about function queries to help you much there
> but
> >>> FieldScoreQuery might work.  I can't see any sign of class
> >>> FunctionQuery in the 3.0.0 core package so am not clear what that
> is.
> >>>
> >>>
> >>> --
> >>> Ian.
> >>>
> >>>
> >>>
> >>> On Mon, Feb 22, 2010 at 8:54 AM, pdaures =
<patrick.daures@gmail.com>
> >>> wrote:
> >>> >
> >>> > Hi,
> >>> > I know that there are many topics about scoring issues, but I
> didn't
> >>> find an
> >>> > answer in the topics.
> >>> > This is the problem :
> >>> > Imagine I'm a teacher, and I have to index all the results,
> comments
> >>> and
> >>> > score about students.
> >>> >
> >>> > Student :
> >>> > String name (eg : John Smith)
> >>> > String comments : (eg: John is a good student, but he needs to =
be
> >>> more self
> >>> > confident bla bla bla)
> >>> > float score (eg : 98)
> >>> >
> >>> > I have to index all the students and when I use the search =
class,
> I
> >>> want to
> >>> > get first the best students. So, if John Smith is a better
> student
> >>> than John
> >>> > Mickael, when I search "John" I want to have John Smith BEFORE
> John
> >>> Mickeal.
> >>> >
> >>> > To do that, I'm using BooleanQuery to search in name and comment
> >>> fields.
> >>> >
> >>> > First, I thought I could use the function =
Document.setBoost(float
> >>> boost)
> >>> > while indexing student, with boost =3D Student.score. But the
> result
> >>> was not
> >>> > what I was expected, it didn't work correctly.
> >>> >
> >>> > Then I thought I could use a FunctionQuery to search :
> >>> > FunctionQuery functionQuery =3D new FunctionQuery(new
> >>> > ReverseOrdFieldSource("score"));
> >>> > But the result was still incorrect.
> >>> >
> >>> > I don't know what I'm doing wrong. Could you help me to find a
> >>> solution ?
> >>> > Thank you :)
> >>> > --
> >>> > View this message in context: http://old.nabble.com/Boost-
> Problem-
> >>> %28again%29%2C-need-example-%21-tp27684388p27684388.html
> >>> > Sent from the Lucene - Java Users mailing list archive at
> Nabble.com.
> >>> >
> >>> >
> >>> > =
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> > --
> > View this message in context: http://old.nabble.com/Boost-Problem-
> %28again%29%2C-need-example-%21-tp27684388p27685594.html
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> >
> >
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>=20
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