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From Michael McCandless <luc...@mikemccandless.com>
Subject Re: Boolean retrieval
Date Sun, 05 Jul 2009 09:59:43 GMT
As of 2.9 (not yet released) the new Collector API allows you to skip
scoring entirely and just collect the doc IDs matching the query.

Mike

On Sat, Jul 4, 2009 at 12:37 PM, 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
> Universität Stuttgart
> email: michells@ims.uni-stuttgart.de
>
>
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