On Sun, Apr 15, 2012 at 12:14 PM, Yonik Seeley <yo...@lucidimagination.com> wrote: > On Sun, Apr 15, 2012 at 11:34 AM, Benson Margulies > <bimargul...@gmail.com> wrote: >> So, I've been experimenting to learn how the _val_ participates in scores. >> >> It seems to me that http://wiki.apache.org/solr/FunctionQuery should >> explain the *effect* of including an _val_ term in an ordinary query, >> starting with a constant. > > It's simply added to the score as any other clause in a boolean query would > be. > >> Positive values of _val_ did lead to >> positive increments in the score, but clearly not by simple addition. > > That's just because Lucene "normalizes" scores. By default, this is > really just multiplying scores by a magic constant (that by default is > the inverse of the sum of squared weights) and doesn't change relative > orderings of docs. If you add debugQuery=true and look at the scoring > explanations, you'll see that queryNorm component. > > If you want to go down the rabbit hole on trunk, see > IndexSearcher.createNormalizedWeight()
I think I should be able to add some text to the wiki that would help fellow Alice's merely by looking at the debugQuery result. Thanks. > > -Yonik > lucenerevolution.com - Lucene/Solr Open Source Search Conference. > Boston May 7-10
