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From Albert Vila Puig <...@imente.com>
Subject Re: Remove a token from a field
Date Fri, 31 Oct 2003 14:16:21 GMT
I know there is no way to update a document without doing a delete/add. 
But I'm asking if this feature is viable to be implemented in an 
efficient way.

Thanks

Erik Hatcher wrote:

> 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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