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From Mark Miller <>
Subject Re: Optional terms in BooleanQuery
Date Tue, 22 May 2007 09:04:34 GMT
Sorry, didn't mean to imply that that whole spiel was a technical 
explanation...just a "how I like to think of it" to get my head around 
the BooleanQuery system. If your reading that, think high level overview 
more than technically accurate. I'll be more specific in the future -- 
as always, the javadocs are the best place to get down to the nitty gritty.

  /** Called once for every non-zero scoring document, with the document 
   * and its score.

TopDocCollector (used by Hits and returned by a Searcher) does ensure 
scores are greater than 0. If you roll your own HitCollector, you 
shouldn't need my thoughts on how I think of BooleanQuery's.

- Mark

Chris Hostetter wrote:
> : Each doc is going to get a score -- if the score is positive the doc
> : will be a hit, if the score is 0 the doc will not be a hit.
> that's actually a fairly missleading statement ... the guts of Lucene
> doesn't prevent documents from "matching" with a negative score
> (specificly: a HitCollector can be asked to collect a match with a
> negative score)
> (dropping matches with negative scores only happens in the Hits
> class/collector as i recall)
> -Hoss
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