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From Chris Hostetter <hossman_luc...@fucit.org>
Subject Re: is there any way to find unique records ?
Date Tue, 21 Nov 2006 18:43:50 GMT

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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:



-Hoss


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