Instead of using a function query, could I use the edismax query (plus some low cost filters not shown in the example) and implement the scale/sum/product computation in a PostFilter? Is the query's maxScore available there?
Thanks, Peter On Wed, Nov 27, 2013 at 1:58 PM, Peter Keegan <peterlkee...@gmail.com>wrote: > Although the 'scale' is a big part of it, here's a closer breakdown. Here > are 4 queries with increasing functions, and theei response times (caching > turned off in solrconfig): > > 100 msec: > select?q={!edismax v='news' qf='title^2 body'} > > 135 msec: > select?qq={!edismax v='news' qf='title^2 > body'}q={!func}product(field(myfield),query($qq)&fq={!query v=$qq} > > 200 msec: > select?qq={!edismax v='news' qf='title^2 > body'}q={!func}sum(product(0.75,query($qq)),product(0.25,field(myfield))))&fq={!query > v=$qq} > > 320 msec: > select?qq={!edismax v='news' qf='title^2 > body'}&scaledQ=scale(product(query($qq),1),0,1)&q={!func}sum(product(0.75,$scaledQ),product(0.25,field(myfield)))&fq={!query > v=$qq} > > Btw, that no-op product is necessary, else you get this exception: > > org.apache.lucene.search.BooleanQuery$BooleanWeight cannot be cast to > org.apache.lucene.queries.function.valuesource.ScaleFloatFunction$ScaleInfo > > thanks, > > peter > > > > On Wed, Nov 27, 2013 at 1:30 PM, Chris Hostetter <hossman_luc...@fucit.org > > wrote: > >> >> : So, this query does just what I want, but it's typically 3 times slower >> : than the edismax query without the functions: >> >> that's because the scale() function is inhernetly slow (it has to >> compute the min & max value for every document in order to know how to >> scale them) >> >> what you are seeing is the price you have to pay to get that query with a >> "normalized" 0-1 value. >> >> (you might be able to save a little bit of time by eliminating that >> no-Op multiply by 1: "product(query($qq),1)" ... but i doubt you'll even >> notice much of a chnage given that scale function. >> >> : Is there any way to speed this up? Would writing a custom function query >> : that compiled all the function queries together be any faster? >> >> If you can find a faster implementation for scale() then by all means let >> us konw, and we can fold it back into Solr. >> >> >> -Hoss >> > >