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From "Tom Emerson" <tremer...@gmail.com>
Subject Re: How are results merged from a multisearcher?
Date Thu, 18 May 2006 21:26:44 GMT
OK, but what does "merged correctly" mean? That is really the crux of my
question: what is the merging semantics across indices with possibly
divergent IDFs.

On 5/18/06, Daniel Naber <lucenelist2005@danielnaber.de> wrote:
>
> On Donnerstag 18 Mai 2006 18:36, Ken Krugler wrote:
>
> > >Could someone describe how the results from multiple indices are merged
> > > when using a MultiSearcher? My naive intuition is that the scores for
> > > documents found in each index could be wildly different, so what
> > > criteria is used to merge the scored docs?
> >
> > I believe they are blindly merged.
> >
> > Which means that the IDFs for terms between multiple indices must be
> > relatively equal, otherwise the results will be skewed.
>
> That was the case in Lucene <= 1.4, in 1.9 it should be fixed, i.e.
> merging
> is supposed to work correctly.
>
> Regards
> Daniel
>
> --
> http://www.danielnaber.de
>
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-- 
Tom Emerson
tremerson@gmail.com
http://www.dreamersrealm.net/~tree
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