Hi,
I have a small problem using function queries. According to
http://wiki.apache.org/solr/FunctionQuery#Date_Boosting and
http://wiki.apache.org/solr/SolrRelevancyFAQ#How_can_I_boost_the_score_of_newer_documents
I've tried using function queries to boost newer documents over older
ones. For my case, I have documents with dates in the future, so I tried
to adapt the example: All dates in the future should have a boost
multiplier of 1. Therefore, I tried using the following function, so all
dates until 100 years in the future should get a 0 through the map
function, and all past dates should end up being used as they are after
the map function, resulting in a boost multiplier of 1 for all future
dates, and all past dates having the normal values of their age
according to the recip function:
recip(map(product(ms(NOW,date_field),3.16e-11),-100,0,0),3.16e-11,1,1)
Unfortunately, this does not seem to work - this function seems to
return 1 for any date_field value
After that, I tried using a workaround, by emulating the recip function
using the div and product and sum functions:
div(1,sum(product(map(product(ms(NOW,date_field),3.16e-11),-100,0,0),3.16e-11),1))
This also did not work .
Finally I checked, whether the map function returns correct values, by
executing the map function alone, so all future days should end up
having 0 for their score. This DID work.
map(product(ms(NOW,date_field),3.16e-11),-100,0,0)
So my question now: Am I doing something wrong or is there a bug in the
recip function?
I am currently using Solr 4.5.1.
Thanks for your help,
Jan
