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From: Paul Elschot <paul.elschot@xs4all.nl>
To: java-user@lucene.apache.org
Subject: Re: scorers and filters
Date: Fri, 10 Aug 2007 21:33:40 +0200
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On Friday 10 August 2007 20:27, Yonik Seeley wrote:
> On 8/10/07, John Wang <john.wang@gmail.com> wrote:
> > Hi Lucene Gurus:
> >
> >     More of a performance question:
> >
> > When you pass a Filter to a searcher to do a search, the searcher is
> > basically doing the full search and then intersect against the bitset 
given
> > by the filter. This seems wasteful when there are lotsa hits returned by 
the
> > scorer and filter only has only a few docs, e.g.
> >
> >      Running a MatchAllDocsQuery given a Filter with only 1 doc.
> >
> >     Right now Scorers don't know about filters, only the searchers do. And
> > scorers are doing most of the computation, but it seems scorers should 
make
> > use of the filters as the corpus before doing any score computation.
> >
> >     Seems to me this is an area that deserves some attention.

Yet another way to formulate the need for a common superclass.
The patch at the issue indicated below is an "extract superclass"
refactoring.
And the latest discussion on it is on java-dev today.

Regards,
Paul Elschot.

> 
> Skip based on the filter and the query...
> See the comments in FilteredQuery, and see
> https://issues.apache.org/jira/browse/LUCENE-584
> 
> -Yonik
> 
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