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 <[EMAIL PROTECTED]> > : Reply-To: java-user@lucene.apache.org, Bhavin Pandya <[EMAIL PROTECTED]> > : 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" <[EMAIL PROTECTED]> > : To: <java-user@lucene.apache.org>; "Bhavin Pandya" <[EMAIL PROTECTED]> > : 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 <[EMAIL PROTECTED]> 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 --------------------------------------------------------------------- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
