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Date: Tue, 4 Oct 2011 03:08:10 -0700 (PDT)
From: sol myr <solmyr72@yahoo.com>
Reply-To: sol myr <solmyr72@yahoo.com>
Subject: Re: [Lucene] Frequencies and positions - are they stored per field?
To: "java-user@lucene.apache.org" <java-user@lucene.apache.org>
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Thanks a lot.=0ABut then what's the added value of Field.TermVector?=0A=0AC=
an't it be deduced from the overall Lucene index? Or is it just inefficient=
 to deduce?=0A=0AThanks again :)=0A=0A=0A=0A----- Original Message -----=0A=
From: Uwe Schindler <uwe@thetaphi.de>=0ATo: java-user@lucene.apache.org; 's=
ol myr' <solmyr72@yahoo.com>=0ACc: =0ASent: Tuesday, October 4, 2011 11:53 =
AM=0ASubject: RE: [Lucene] Frequencies and positions - are they stored per =
field?=0A=0ALucene always uses a field, a query using a term without a fiel=
d is=0Aimpossible. See each field as a parallel inverted index; all statist=
ics are=0Aper field, too. If you pass a query without a field name to Query=
Parser it=0Awill chose the default field, that=E2=80=99s given when creatin=
g the QueryParser.=0A=0AUwe=0A=0A-----=0AUwe Schindler=0AH.-H.-Meier-Allee =
63, D-28213 Bremen=0Ahttp://www.thetaphi.de=0AeMail: uwe@thetaphi.de=0A=0A=
=0A> -----Original Message-----=0A> From: sol myr [mailto:solmyr72@yahoo.co=
m]=0A> Sent: Tuesday, October 04, 2011 11:46 AM=0A> To: lucene=0A> Subject:=
 [Lucene] Frequencies and positions - are they stored per field?=0A> =0A> =
=0A> =0A> Hi,=0A> =0A> I use Lucene, but an not familiar with its internals=
.=0A> I'd appreciate help understanding whether Term Frequences and Positio=
ns -=0Aare=0A> stored=C2=A0 per Document of per Field?=0A> On the one hand,=
 I never ask for "Field.TermVector" because I read it's=0Aonly=0A> required=
 for "MoreLikeThis" (which I don't need).=0A> On the other hand, my searche=
s *are* based on fields...=0A> =0A> Here's my code:=0A> // Write (without F=
ield.TermVector):=0A> =0A> Document doc=3Dnew Document();=0A> doc.add(new F=
ield("subject",=C2=A0 "Requisition request", Store.YES,=0A> Index.ANALYZED)=
); doc.add(new Field("body",=C2=A0 "Attached is an Urgent=0A> requisition r=
equest", Store.YES, Index.ANALYZED)); write.addDocument(doc);=0A> =0A> // A=
nd my Query:=0A> Query query=3Dparser.parse("subject : urgent");=0A> =0A> N=
ow how does Lucene manage this query?=0A> I asked it to search the "subject=
" Field.=0A> But if the "inverted index" doesn't keep fields, it would only=
 remember=0Athat=0A> "The term 'Urgent' appears in SOME FIELD of document#1=
 "...=0A> Isn't it true?=0A> =0A> If so, how would it make sure to retrieve=
 only documents that match in the=0A> Subject ?=0A> =0A> Thanks.=0A> =0A> =
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