I would like to use a query function to boost documents of a certain "type". I realize that I can use a boost query for this, but in analyzing the scoring it doesn't seem as predictable as the query functions.
So, imagine I have a field called "foo". Foo contains a value that indicates what type of document this is. For now there are only document types of "BAR" and "BAZ". I would like documents of type BAR to be boosted much more strongly then documents of type BAZ. As far as I can all of the query functions seem to work with fields that contain numbers. The only exception being the ord() functions, but those don't provide the stability I would like, as I can always introduce a new document type down the road and risk screwing up my results. Can this be done with function queries? As a follow up, how difficult would it be for me to write my own function (and plug it into Solr) that allowed me to return a 1.0 or 0.0 if a field had a particular string value in it? A function that would look something like "fieldEq(foo,BAR)" -Todd Feak
