Piotr,
Lucene offers you possibility to boost paricular fields
in a document but this functionality is not used in nutch (as far as I can tell).
First this statement confuse me, but after digging in the sources I would say you are right.
I missed that until writing my last mail and was thinking nutch use field boosting as well since this is one of the cool features of lucene.
I simply oversee that the basic query filter only search in a set of fields, since I was just too much thinking in the use case of my shortly submitted plugin.
Anyway I have two thoughts in general.
Some days ago I was reading "Why Writing Your Own Search Engine Is Hard" by Anna Patterson and one of the repeated suggestions was something like "pre calculate ranking where ever you can".
Well I'm not able to say if this translatable to nutch or lucene in general, may only Doug or Erik can give any comment.
So I would be interested to know if boosting until index time is faster until search time then using boosting until query generation.
The other thought is, since now there are some people think about ranking, I asking myself what kind of abstractions we can do to make ranking improvements more easily to implement.
First I would say it make sense to make boosting values configurable since some people can play around and report experience.
Furthermore I would be interested to see a discussion if and where we may can create a extension point that allows implementing of ranking plugins.
This would be may be very interesting for the research community to play around with it.
I'm very interested to see your patch tomorrow. :-)
Stefan
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