Hi, To merge TopDocs with "compatible scores", you can use the new Lucene (since 3.3) method: TopDocs.merge(). Just execute the query on different indexes with same topdocs count and execute this method.
Uwe ----- Uwe Schindler H.-H.-Meier-Allee 63, D-28213 Bremen http://www.thetaphi.de eMail: u...@thetaphi.de > -----Original Message----- > From: Trejkaz [mailto:trej...@trypticon.org] > Sent: Wednesday, February 15, 2012 1:57 AM > To: java-user@lucene.apache.org > Subject: Re: Merging results from two searches on two separate Searchers > > On Wed, Feb 15, 2012 at 11:46 AM, Uwe Schindler <u...@thetaphi.de> wrote: > > Scores are only compatible if the query is the same, which is not the case > > for > you. > > So you cannot merge hits from different queries. > > So I guess in the case where the different query parsers happen to generate > the > same query, it's safe to do then. This is actually much better than I was > expecting. :) > > Which leaves the (hopefully rarer) case of them generating actually-different > queries. > > I assume the cause for the incompatibility is something like this: > > User's query: "cats" > Suppose query parser 1 converts to "text:cats" > Suppose query parser 2 converts to "text:cat" > > Because query parser 2 is converting "cat" -> "cat" as well as "cats" > -> "cat", this affects the doc frequency of "cat", which as a result > affects the score. > > But of course we want all the results in one list at the end, so we have to > merge > it *somehow*. So I was wondering that if the score by itself is not enough, > maybe there is some way to weight it so that it can be merged again. > > TX > > --------------------------------------------------------------------- > To unsubscribe, e-mail: java-user-unsubscr...@lucene.apache.org > For additional commands, e-mail: java-user-h...@lucene.apache.org --------------------------------------------------------------------- To unsubscribe, e-mail: java-user-unsubscr...@lucene.apache.org For additional commands, e-mail: java-user-h...@lucene.apache.org
