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: <[email protected]>; "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
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