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How to implement Time/(Distance)^2 in solr?

I want to implement Time/Distance^2 in solr. e.g.:

user locality is : BTM

Question1: posted 5hrs before. and distance from my locality is 2kms :5/4=1.25

Question2 posted 2hrs before. and distance from my locality is 4kms: 2/16=0.125

Question3 posted 4hrs before. and distance from my locality is 3kms : 4/9:0.44

Now when I fire the solr query, Results should come in the following order based on T/D^2 formula:

question1 then question3 and question1
Solution

  • You could use a function query. See FunctionQuery

    You could order by the function. Use the functions div and pow.

    sort=div(Time/pow(Distance,2)) asc

    or

    sort=div(Time/pow(Distance,2)) desc

    You may add the function to the field list to debug the function:

    fl=*,div(Time,pow(Distance,2))