Hi! Thanks for the directions! I got it up and running with a custom ValueSourceParser: http://pastebin.com/cz1rJn4A and a custom ValueSource: http://pastebin.com/j8mhA8e0
It basically allows for searching for text (which is associated to an image) in an index and then getting the distance to a sample image (base64 encoded byte[] array) based on one of five different low level content based features stored as DocValues. A sample result is here: http://pastebin.com/V7kL3DJh So there one little tiny question I still have ;) When I'm trying to do a "sort" I'm getting "msg": "sort param could not be parsed as a query, and is not a field that exists in the index: lirefunc(cl_hi,FQY5DhMYDg0ODg0PEBEPDg4ODg8QEgsgEBAQEBAgEBAQEBA=)", for the call http://localhost:9000/solr/lire/select?q=*%3A*&sort=lirefunc(cl_hi%2CFQY5DhMYDg0ODg0PEBEPDg4ODg8QEgsgEBAQEBAgEBAQEBA%3D)+asc&fl=id%2Ctitle%2Clirefunc(cl_hi%2CFQY5DhMYDg0ODg0PEBEPDg4ODg8QEgsgEBAQEBAgEBAQEBA%3D)&wt=json&indent=true cheers, Mathias On Tue, Sep 17, 2013 at 1:01 AM, Chris Hostetter <hossman_luc...@fucit.org> wrote: > : dissimilarity functions). What I want to do is to search using common > : text search and then (optionally) re-rank using some custom function > : like > : > : http://localhost:8983/solr/select?q=*:*&sort=myCustomFunction(var1) asc > > can you describe what you want your custom function to look like? it may > already be possible using the existing functions provided out of hte box - > just neeed to combine them to build up the mathc expression... > > https://wiki.apache.org/solr/FunctionQuery > > ...if you really want to write your own, just implement ValueSourceParser > and register it in solrconfig.xml... > > https://wiki.apache.org/solr/SolrPlugins#ValueSourceParser > > : I've seen that there are hooks in solrconfig.xml, but I did not find > : an example or some documentation. I'd be most grateful if anyone could > : either point me to one or give me a hint for another way to go :) > > when writing a custom plugin like this, the best thing to do is look at > the existing examples of that plugin. almost all of hte built in > ValueSourceParsers are really trivial, and can be found in tiny anonymous > classes right inside the ValueSourceParser.java... > > For example, the function ot divide the results of two other fnctions... > > addParser("div", new ValueSourceParser() { > @Override > public ValueSource parse(FunctionQParser fp) throws SyntaxError { > ValueSource a = fp.parseValueSource(); > ValueSource b = fp.parseValueSource(); > return new DivFloatFunction(a, b); > } > }); > > ..or, if you were trying to bundle that up in your own plugin jar and > register it in solrconfig.xml, you might write it something like... > > public class DivideValueSourceParser extends ValueSourceParser { > public DivideValueSourceParser() { } > public ValueSource parse(FunctionQParser fp) throws SyntaxError { > ValueSource a = fp.parseValueSource(); > ValueSource b = fp.parseValueSource(); > return new DivFloatFunction(a, b); > } > } > > and then register it as... > > <valueSourceParser name="div" class="com.you.DivideValueSourceParser" /> > > > depending on your needs, you may also want to write a custom ValueSource > implementation (ie: instead of DivFloatFunction above) in which case, > again, the best examples to look at are all of the existing ValueSource > functions... > > https://lucene.apache.org/core/4_4_0/queries/org/apache/lucene/queries/function/ValueSource.html > > > -Hoss -- Dr. Mathias Lux Assistant Professor, Klagenfurt University, Austria http://tinyurl.com/mlux-itec
