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From Paul Elschot <paul.elsc...@xs4all.nl>
Subject Re: Boolean retrieval
Date Sat, 04 Jul 2009 20:43:32 GMT
It is also possible to use the HitCollector api and simply ignore
the score values.

Regards,
Paul Elschot


On Saturday 04 July 2009 21:14:41 Mark Harwood wrote:
> 
> Check out booleanfilter in contrib/queries. It can be wrapped in a constantScoreQuery
> 
> 
> 
> On 4 Jul 2009, at 17:37, Lukas Michelbacher <michells@ims.uni-stuttgart.de> wrote:
> 
> 
> This is about an experiment comparing plain Boolean retrieval with
> vector-space-based retrieval.
> 
> I would like to disable all of Lucene's scoring mechanisms and just
> run a true Boolean query that returns exactly the documents that match a
> query specified in Boolean syntax (OR, AND, NOT). No scoring or sorting
> required.
> 
> As far as I can see, this is not supported out of the box.  Which classes
> would I have to modify?
> 
> Would it be enough to create a subclass of Similarity and to ignore all terms but one
(coord, say) and make this term return 1 if the query matches the document and 0 otherwise?
> 
> Lukas
> 
> --
> Lukas Michelbacher
> Institute for Natural Language Processing
> Universit├Ąt Stuttgart
> email: michells@ims.uni-stuttgart.de
> 
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