Boolean retrieval

[Lukas Michelbacher <mi...@ims.uni-stuttgart.de>]

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

Re: Boolean retrieval

[Michael McCandless <lu...@mikemccandless.com>]

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<mi...@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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