Order by an expression in Solr

Question

In SQL you can order by an expression like:

SELECT * FROM a
ORDER BY CASE WHEN a.Category = 20 THEN 1 ELSE 0 DESC

so records who have Categ

Answer 1

I've accepted hross's answer, but it's also possible to do something like this in Solr 1.3 and up, using:

/select?q={!func}map(Category,20,20,1,0)&sort=score desc

The cool thing is that you can still sort on other fields, so:

&sort=score desc, name asc