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From "Abhay Saswade" <abhay_sasw...@hotmail.com>
Subject RE: Query grouping
Date Tue, 07 Jan 2003 20:32:45 GMT
Thanks Eric.
Looks like new I need to write some grammar to construct the search query.






>From: "Eric Isakson" <Eric.Isakson@sas.com>
>Reply-To: "Lucene Users List" <lucene-user@jakarta.apache.org>
>To: "Lucene Users List" <lucene-user@jakarta.apache.org>
>Subject: RE: Query grouping
>Date: Mon, 6 Jan 2003 13:52:22 -0500
>
>Abhay,
>
>This query is processed by the query parser...
>
>((+SEARCH_NAME:dvd +SEARCH_NAME:cd ) OR (+DEF_DOC_FIELD:dvd
>+DEF_DOC_FIELD:cd )) AND ((-SEARCH_NAME:player) OR (-DEF_DOC_F
>IELD:player))
>
>and comes out looking like...
>+((+SEARCH_NAME:dvd +SEARCH_NAME:cd) (+DEF_DOC_FIELD:dvd 
>+DEF_DOC_FIELD:cd)) +((-SEARCH_NAME:player) (-DEF_DOC_FIELD:player))
>Using org.apache.lucene.search.Query.toString(String fieldName)
>
>I use this representation as it shows me what happened after my query was 
>processed by the QueryParser and Analyzer, so stop words would be removed 
>and case modified if the analyzer does such things.
>
>
>This part...
>+((+SEARCH_NAME:dvd +SEARCH_NAME:cd) (+DEF_DOC_FIELD:dvd 
>+DEF_DOC_FIELD:cd))
>will produce a set of documents as hits that have the "dvd" and "cd" terms 
>in those fields
>
>This part...
>+((-SEARCH_NAME:player) (-DEF_DOC_FIELD:player))
>will always produce an empty set
>
>when the two sets are joined with an intersection, you will always get an 
>empty set
>
>The problem is that when using NOT or - operator, it excludes documents 
>from the set of found documents not the set of all documents. This is 
>correct Lucene behavior. So, since their are no found documents in that 
>required part of the query, your results will always be no hits.
>
>This is mentioned in the jGuru FAQ at 
>http://www.jguru.com/faq/view.jsp?EID=593598
>
>Rearranging the query the way you mentioned is the correct way to deal with 
>this.
>
>Eric
>
>-----Original Message-----
>From: Abhay Saswade [mailto:abhay_saswade@hotmail.com]
>Sent: Friday, January 03, 2003 9:07 PM
>To: lucene-user@jakarta.apache.org
>Subject: Re: Query grouping
>...
>
>However, when I try to do this in a single query by grouping I get no 
>result
>((+SEARCH_NAME:dvd +SEARCH_NAME:cd ) OR (+DEF_DOC_FIELD:dvd
>+DEF_DOC_FIELD:cd )) AND ((-SEARCH_NAME:player) OR (-DEF_DOC_F
>IELD:player))
>
>I don't get any results on a single term query like this (and this explains
>why I am not getting any results in above query)
>-SEARCH_NAME:player
>Is this a known issue?
>
>Is there any way of dealing with above-mentioned problem other than
>rearranging query like this?
>(+SEARCH_NAME:dvd +SEARCH_NAME:cd -SEARCH_NAME:player) OR
>(+DEF_DOC_FIELD:dvd +DEF_DOC_FIELD:cd -DEF_DOC_FIELD:player)
>
>Thanks
>Abhay
>
>
>
>
>
>
> >From: Otis Gospodnetic <otis_gospodnetic@yahoo.com>
> >Reply-To: "Lucene Users List" <lucene-user@jakarta.apache.org>
> >To: Lucene Users List <lucene-user@jakarta.apache.org>
> >Subject: Re: Query grouping
> >Date: Fri, 3 Jan 2003 12:33:53 -0800 (PST)
> >
> >Does the '... AND -.....' part even make sense?
> >Why not just .... -.... ?
> >Also, .... AND +.... doesn't make sense, does it?
> >+<field>:<term> means the term has to be in the result, so AND is not
> >really needed, is it?
> >I am not sure if spaces after 'SEARCH_NAME:' make a difference or not
> >
> >Also, field:term1 field:term2 implies term1 OR term2, so no need for OR
> >there, especially with +, I think.
> >
> >Otis
> >
> >
> >--- Abhay Saswade <abhay_saswade@hotmail.com> wrote:
> > > I am using lucene release 1.2. I am using StandardAnalyzer. Have
> > > anybody
> > > faced this problem?
> > >
> > > I get same results when I run following queries
> > >
> > > 1. (+SEARCH_NAME:jhon  +SEARCH_NAME:joy)  AND -SEARCH_NAME:chan
> > > 2. (+SEARCH_NAME:jhon  AND +SEARCH_NAME: joy)  AND -SEARCH_NAME:chan
> > > 3. (+SEARCH_NAME:jhon  OR +SEARCH_NAME: joy)  AND -SEARCH_NAME:chan
> > >
> > > But when I regroup the query by putting brackets around the last term
> > > like
> > > mentioned below I don't get any results
> > >
> > > 1. (+SEARCH_NAME:jhon +SEARCH_NAME: joy)  AND (-SEARCH_NAME:chan)
> > > 2. (+SEARCH_NAME:jhon AND +SEARCH_NAME: joy)  AND (-SEARCH_NAME:chan)
> > > 3. (+SEARCH_NAME:jhon OR +SEARCH_NAME: joy)  AND (-SEARCH_NAME:chan)
> > >
> > > This is just an example. I need to do grouping on various fields. Am
> > > I
> > > missing something?  Is there any document other than
> > > http://jakarta.apache.org/lucene/docs/queryparsersyntax.html? Can
> > > somebody
> > > throw some light on this?
> > >
> > > Thanks,
> > > Abhay
> > >
> > >
> > >
> > >
> > >
> > >
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