Hi Michael,
I forgot to include what I did for one customer : 1) Using StatsComponent I get min and max values of the field (year) 2) Calculate "smart gap/range values" according to minimum and maximum. 3) Re-issue the same query (for thee second time) that includes a set of facet.query. Ahmet On Monday, March 3, 2014 10:30 PM, Ahmet Arslan <iori...@yahoo.com> wrote: Hi, Regarding "just a simple subtraction" you do it in indexer code or in a update prcessor too. You can either modify original field or you can create an additional one. Java-script could be used : http://wiki.apache.org/solr/ScriptUpdateProcessor Ahmet On Monday, March 3, 2014 9:11 PM, Michael Lackhoff <mich...@lackhoff.de> wrote: Hi Ahmet, > There is no built in solution for this. Yes, I know, that's why I would like the TokenFilterFactory > Two workaround : > > 1) use facet.limit=-1 and invert the list (faceting response) at client side > > 2) use multiples facet.query > a)facet.query=year:[2012 TO 2014]&facet.query=year:[2010 TO 2012] > b)facet.query=year:2014&facet.query=year:2013 ... I thought about these but they have the disadvantage that 1) could return hundreds of facet entries. 2b) is better but would need about 30 facet-queries which makes quite a long URL and it wouldn't always work as expected. There are subjects that were very popular in the past but with no (or very few) recent publications. For these I would get empty results for my 2014-1985 facet-queries but miss all the stuff from the 1960s. From all these thoughts I came to the conclusion that a custom TokenFilterFactory could do exactly what I want. In effect it would give me a reverse sort: 10000 - 2014 = 7986 10000 - 2013 = 7987 ... The client code can easily regain the original year values for display. And I think it shouldn't be too difficult to write such a beast, only problem is I am not a Java programmer. That is why I asked if someone has done it already or if there is a guide I could use. After all it is just a simple subtraction... -Michael
