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From "Dion Almaer" <d...@almaer.com>
Subject RE: Dates and others
Date Thu, 27 Nov 2003 03:19:28 GMT
Hi guys -

So I am getting happier with search, and just pushed the lucene version live at:

http://www.theserverside.com (on the leftbar) and:
http://www.theserverside.com/home/search/index.jsp

The only real item that I still want to tweak more is getting recent results higher in the
list.

I was wondering if something like this could work (or if there is a better solution)

At index time, I have the date of the content.  I could do some math where the higher the
date
(based on the time_t version or whatever) the more of a setBoost(metric). Or, for every month
in the
past, create a larger negative number to setBoost()... or something like that.

Would something like this make sense?

Dion


> -----Original Message-----
> From: Erik Hatcher [mailto:erik@ehatchersolutions.com] 
> Sent: Sunday, November 23, 2003 3:52 PM
> To: Lucene Users List
> Subject: Re: Dates and others
> 
> On Saturday, November 22, 2003, at 06:33  PM, Dion Almaer wrote:
> > 3. I have some fields suck as title, owner, etc as well as 
> the content 
> > blob which I index and use as the default search field.  Is 
> there an 
> > easy way to extend the QueryParser to merge it with a 
> MultiTermQuery 
> > which can also search this meta data and give them certain 
> weights?  
> > Or, if you go down this path do you have to leave the QueryParser 
> > behind and build your own queries?  Any best practices 
> would be great.
> 
> And Ype said:
> You can provide field weights at document indexing time 
> (norms) and use a MultiTermQuery for searching multiple 
> fields. At query time you can again use field weights.
> I don't know how the scoring of the MultiTermQuery is done, 
> it might use the max. score over the fields of a document, or 
> combine the scores in the fields of a document.
> ---- end Ype's reply cut and paste
> 
> I'm a little confused with this question and Ype's reply.  
> MultiTermQuery is an abstract base class under Query, which 
> is the parent for WildcardQuery and FuzzyQuery.
> 
> What I think you're after is using MultiFieldQueryParser, but 
> you want to weight the fields differently.  You can add the 
> boosts at indexing time using Field.setBoost.  Unfortunately 
> at the moment MultiFieldQueryParser is not very extensible - 
> there are some open issues with its subclassability but 
> subclassing MFQP and overriding getFieldQuery will do the 
> trick when the subclassing issues are resolved allowing you 
> to boost at query time.
> 
> Making an educated guess at what you're doing with Lucene, 
> Dion, I'd venture to say that boosting at indexing time is 
> sufficient for your needs.
> 
> 	Erik
> 
> 
> 
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