Mailing-List: contact lucene-user-help@jakarta.apache.org; run by ezmlm
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Reply-To: "Lucene Users List" <lucene-user@jakarta.apache.org>
Date: Fri, 31 Oct 2003 05:18:31 -0500
Subject: Re: Remove a token from a field
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From: Erik Hatcher <erik@ehatchersolutions.com>
To: "Lucene Users List" <lucene-user@jakarta.apache.org>
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In-Reply-To: <3FA222ED.8020707@imente.com>
Message-Id: <93BEB0DC-0B8B-11D8-BCDC-000393A564E6@ehatchersolutions.com>

On Friday, October 31, 2003, at 03:53  AM, Albert Vila Puig wrote:
> Hi,
>
>    Is there a way to remove a token from a document field entry?. For  
> example, I've got a UnStored field in my index and I want to remove a  
> token from this field without doing the delete and add document  
> (because I'm inserting the documents by date and I don't want to loose  
> that sort).
>
>    Is there an easy way to do that? Has anybody already started  
> implementing it? Any suggestions about if I can do it in an efficient  
> way? Maybe with another deletable file by fields?

Presently there is no way to "update" a document without doing a  
delete/add.

The sorting issue is an interesting one.  By design, of course, Lucene  
is meant to sort by score - period.  There has been an interesting  
implementation of a custom searcher posted about this topic in the  
recent past:

	http://cvs.sourceforge.net/viewcvs.py/weblucene/weblucene/webapp/WEB- 
INF/src/org/apache/lucene/search/ 
IndexOrderSearcher.java?rev=1.2&view=auto

It would be a performance hit to access the contents of a document  
during searching to pull the contents of a field though, but that  
search method shown could be adapted to do so and sort by a particular  
field during searching.

I tend to suggest that date sorting is something that should be done on  
a data set culled from hits after searching is complete rather than  
during the searching operation itself.  There are games that could be  
played with boosts and perhaps a custom Similarity implementation that  
might be able to pull off date sorting somehow too - I'll add this to  
my list of interesting things to try out for fun.

	Erik


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