Hi, Have anyone written any conditional functions yet for use in Function Queries?
I see the use for a function which can run different sub functions depending on the value of a field. Say you have three documents: A: title=Sports car, color=red B: title=Boring car, color=green B: title=Big car, color=black Now we have a requirement to boost red cars over green and green cars over black. The only way I have found to do this today is (ab)using the map() function. DisMax syntax: q=car&bf=sum(map(query($qr),0,0,0,100.0),map(query($qg),0,0,0,50.0))&qr=color:red&qg=color:green But I suspect this is expensive in terms of two sub queries being applied and scored. An elegant way to achieve the same would be through a new native if() or case() function: q=car&bf=if(color=="red"; 100; if(color=="green"; 50; 0)) OR q=car&bf=case(color, "red":100, "green":sum(30,20)) What do you think? -- Jan Høydahl, search solution architect Cominvent AS - www.cominvent.com
