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From Steven Rowe <sar...@syr.edu>
Subject Re: is there any way to find unique records ?
Date Tue, 21 Nov 2006 18:59:29 GMT
Bhavin,

Mark Harwood gives a solution that looks almost exactly like what you want:

   http://www.mail-archive.com/java-user@lucene.apache.org/msg05154.html

Steve

Chris Hostetter wrote:
> serach the archives for "faceted searching" and "category counts" and you
> should find lots of discussions on this topic.
> 
> : Date: Tue, 21 Nov 2006 20:30:22 +0530
> : From: Bhavin Pandya <bhavinp@rediff.co.in>
> : Reply-To: java-user@lucene.apache.org, Bhavin Pandya <bhavinp@rediff.co.in>
> : To: java-user@lucene.apache.org
> : Subject: Re: is there any way to find unique records ?
> :
> : Hi Erick,
> :
> : > If your asking for a list of all the unique values for a particular field,
> : > see TermDocs and/or TermEnum which will allow you to look at, say, all the
> : > values stored for some field. A trick here is to seek (new Term("field",
> : > ""));. By putting nothing in the value, you effectively enumerate them
> : > all,
> : > something that I didn't find obvious
> :
> : I think your above solution is very near to what i am looking for ,
> : But little bit different way...
> : here is what i am planning to do...
> :
> : Suppose my index has four fields "product-title" , "product-desc" ,
> : "category" and "FLAG"    ( Fieldname FLAG has value "true" for each n every
> : doc in index ...just added for iteration purpose )
> :
> : At search time.. .
> : query =  +(product-title:nokia) +(product-desc:nokia)
> : Hits hits = searcher.search(query);
> : I want to fetch unique "category" from above hits object...
> :
> : But i dont want to iterate through Hits object....
> :
> : Now As per your suggestions,  I can do something like this...
> : TermEnum  enum = termDocs(new Term("FLAG","true")
> : But it will return enumeration of all the document which is in index...But i
> : want enumeration of all the document which is relevant to "nokia"...
> : How to . . ?
> :
> : Thanks
> : - Bhavin pandya
> :
> :
> : ----- Original Message -----
> : From: "Erick Erickson" <erickerickson@gmail.com>
> : To: <java-user@lucene.apache.org>; "Bhavin Pandya" <bhavinp@rediff.co.in>
> : Sent: Tuesday, November 21, 2006 7:01 PM
> : Subject: Re: is there any way to find unique records ?
> :
> :
> : > I don't think I understand what "only unique records from a single field"
> : > means.  If it's a unique value in a filed, there'll only be one document
> : > in
> : > the hits object and there's no cost to iterating, so I doubt that's what
> : > you
> : > mean.
> : >
> : > If your asking for a list of all the unique values for a particular field,
> : > see TermDocs and/or TermEnum which will allow you to look at, say, all the
> : > values stored for some field. A trick here is to seek (new Term("field",
> : > ""));. By putting nothing in the value, you effectively enumerate them
> : > all,
> : > something that I didn't find obvious.
> : >
> : > If neither of these are close to the mark, perhaps you could provide more
> : > detail.
> : >
> : > Best
> : > Erick
> : >
> : > On 11/21/06, Bhavin Pandya <bhavinp@rediff.co.in> wrote:
> : >>
> : >> Hi,
> : >> In lucene, is there any way to find only unique records from a single
> : >> field ..?
> : >>
> : >> otherwise unnecessary i have to itereate through Hits and find out
> : >> unique...
> : >>
> : >> plz help..
> : >>
> : >> - Bhavin pandya


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