The usual fix for this is log(1+qty). If you might have negative values, you can use log(max(1,qty)).
wunder Walter Underwood wun...@wunderwood.org http://observer.wunderwood.org/ On Oct 20, 2014, at 3:04 PM, O. Olson <olson_...@yahoo.it> wrote: > I am considering using a boost as follows: > > &boost=log(qty) > > Where qty is the quantity in stock of a given product i.e. qty could be 0, > 1, 2, 3, … etc. The problem I see is that log(0) is -Infinity. Would this be > a problem for Solr? For me it is not a problem because > log(0) < log(1) < log(2) etc. > > I'd be grateful for any thoughts. One alternative is to use max e.g. > &boost=max(log(qty), -1) > > But still this would cause Solr to compute the -Infinity and then discard > it. So can I use an expression for boost that would result in –Infinity? > > Thank you > O. O. >
