Hi Jarvis,
> I have a problem that how to "combine" two score to sort the search > result documents. > for example I have 10 million pages in lucene index , and i know their > pagerank scores. i give a query to it , every docs returned have a > lucene-score, mark it as R (relevant score), and i also have its > pagerank score, mark it as P, what i need is i want to sort the search > result base on the value "P+R". You know if i store the pagerank score in > index and get it every search time , then compute P+R , then sort it , this > way is too slow. in my system , when the search hits 500000 result , the > sort may cost about 20s. > Check CustomScoreQuery in http://lucene.apache.org/java/2_3_2/api/core/org/apache/lucene/search/function/package-summary.html Probably something like this: - implement ValueSource on top of the pagerank values, - create a valueSourceQuery on top of it, - create a customScoreQuery on top of the original query and the valueSourceQuery. Note that by default, customScoreQuery multiplies the scores, but you can override this. Doron
