On Thu, Apr 19, 2012 at 3:49 PM, Benson Margulies <bimargul...@gmail.com> wrote: > On Thu, Apr 19, 2012 at 1:34 PM, Robert Muir <rcm...@gmail.com> wrote: >> On Thu, Apr 19, 2012 at 1:26 PM, Benson Margulies <bimargul...@gmail.com> >> wrote: >>> I am trying to solve a problem using DisjunctionMaxQuery. >>> >>> >>> Consider a query like: >>> >>> a:b OR c:d OR e:f OR ... >>> name:richard OR name:dick OR name:dickie OR name:rich ... >>> >>> At most, one of the richard names matches. So the match score gets >>> dragged down by the long list of things that don't match, as the list >>> can get quite long. >>> >>> It seemed to me, upon reading the documentation, that I could cure >>> this problem by creating a query tree that used DisjunctionMaxQuery >>> around all those nicknames. However, when I built a boolean query that >>> had, as a clause, a DisjunctionMaxQuery in the place of a pile of >>> these individual Term queries, the score and the explanation did not >>> change at all -- in particular, the coord term shows the same number >>> of total terms. So it looks as if the children of the disjunction >>> still count. >>> >>> Is there a way to control that term? Or a better way to express this? >>> Thinking SQL for a moment, what I'm trying to express is >>> >>> name IN (richard, dick, dickie, rich) >>> >> >> I think you just want to disable coord() here? You can do this for >> that particular boolean query by passing true to the ctor: >> >> public BooleanQuery(boolean disableCoord) > > Rob, > > How do nested queries work with respect to this? If I build a boolean > query one of whose clauses is a BooleanQuery with coord turned off, > does just the nested query insides get left out of 'coord'? > > If so, then your answer certainly seems to be what the doctor ordered. >
it applies only to that query itself. So if this BQ is a clause to another BQ that has coord enabled, that would not change the top-level BQ's coord. Note: if you don't want coord at all, then you can also plug in a Similarity that returns 1, or pick another Similarity like BM25: in trunk only the vector space impl even does anything for coord().... -- lucidimagination.com --------------------------------------------------------------------- To unsubscribe, e-mail: java-user-unsubscr...@lucene.apache.org For additional commands, e-mail: java-user-h...@lucene.apache.org
