On Mon, Oct 12, 2009 at 12:03 PM, Andrzej Bialecki <a...@getopt.org> wrote: >> Solr never discarded non-positive hits, and now Lucene 2.9 no longer >> does either. > > Hmm ... The code that I pasted in my previous email uses > Searcher.search(Query, int), which in turn uses search(Query, Filter, int), > and it doesn't return any results if only the first clause is present (the > one with negative boost) even though it's a matching clause. > > I think this is related to the fact that in TopScoreDocCollector:48 the > pqTop.score is initialized to 0, and then all results that have lower score > that this are discarded. Perhaps this should be initialized to > Float.MIN_VALUE?
Hmmm, You're actually seeing this with Lucene 2.9? The HitQueue (subclass of PriorityQueue) is pre-populated with sentinel objects with scores of -Inf, not zero. -Yonik http://www.lucidimagination.com
