yup that clarifies things a lot, thanks.
Mike Klaas wrote: > > On 10-Oct-07, at 4:16 AM, Britske wrote: > >> >> However, I realized that for calculating the count for each of the >> facetvalues, the original standardrequesthandler already loops the >> doclist >> to check for matches. Therefore my implementation actually does >> double work, >> since it gets doclists for each of the facetvalues again. > > Well, not quite. Once you get into the faceting code, everything is > in terms of DocSets, which are undordered collections of doc ids. > Also, faceting employs efficient algorithms for counting the > cardinality of intersections without actually materializing them, > which is another difficulty to reusing the code. > >> My question: >> is there a way to get to the already calculated doclist per >> facetvalue from >> a subclassed StandardRequestHandler, and so get a nice speedup? This >> facet-falculation seems to go deep into the core of Solr >> (SimpleFacets.getFacetTermEnumCounts) and seems not very sensible >> to alter >> for just this requirement. opinions appreciated. > > Solr never really materializes much of the DocList for a query-- > almost all docs are dropped as soon as it is clear that they are not > in the top N results. > > It should be possible to produce an approximation which is more > efficient, like collecting the DocList for the top 1000 docs, > converting it to a DocSet, find the set intersections (instead of > using SimpleFacets), and re-order the resulting sets in terms of the > original DocList. > > It would take a bit of work to implement, however. > >> >> As a last and somewhat related question: >> is there a way to explicity specify facet-values that I want to >> include in >> the faceting without (ab)using Q? This is relevant for me since >> the perfect >> solution would be to have the ability to orthogonally get multiple >> toplists >> in 1 query. Given the current implementation, this orthoganality is >> now >> 'corrupted' as injection of a fieldvalue in Q for one facetfield >> influences >> the outcome of another facetfield. > > I'm not quite sure what you are asking here. You can specify > arbitrary facet values using facet.query or facet.prefix. If you > want to facet multiple doclists from different queries in one > request, just write your own request handler that takes a multi- > valued q param and facets on each. > > I didn't answer all the questions in your email, but I hope this > clarifies things a bit. Good luck! > > -Mike > > -- View this message in context: http://www.nabble.com/showing-results-per-facet-value-efficiently-tf4600154.html#a13163943 Sent from the Solr - User mailing list archive at Nabble.com.
