On Thu, Jun 16, 2011 at 3:23 PM, Gabriele Kahlout <gabri...@mysimpatico.com> wrote: >> I'm trying to assess the impact of coord (search-time) on Qtime. In one > implementation coord returns 1, while in another it's actually computed.
On query time? coord should be really cheap (unless your impl does something like calculate a million digits of pi), as it is not actually computed per-document. instead, the result of all possible coord factors (e.g. 1/5, 2/5, 3/5, 4/5, 5/5) is computed up-front by BooleanQuery's scorers into a table. See http://svn.apache.org/repos/asf/lucene/dev/trunk/lucene/src/java/org/apache/lucene/search/BooleanScorer.java and http://svn.apache.org/repos/asf/lucene/dev/trunk/lucene/src/java/org/apache/lucene/search/BooleanScorer2.java
