Hi, I'm trying the BoostQParserPlugin and FunctionQuery to enable query time boosting. It works better than bf (boost function) because it multiplies the relevancy score by the boosts. However I noticed significant performance issues with it. The more functions I use as boosts, the slower it gets. For example, if a query without boosts takes 300ms, adding a boost function like log(popularity) becomes 600ms, using pow(log(popularity),2) takes 800ms, using product(pow(log(score_total),2),recip(rord(days),1,90,90)) takes 1100ms. Ideally I'd like to pass in a reasonable amount of functions to adjust the search ranking dynamically without sacrificing much performance.
Thanks, Guangwei
