Question

What is the right syntax if my query is formulated incorrectly in the link above for Apache 3.5 SOLR and do I have to enable anything specific in solrconfig.xml and schema.xml

Using Apache SOLR 3.5 and receiving a ParseException Uknown function termfreq in FunctionQuery(tf(text,amplifiers)’

http://localhost:8983/solr/select/?fl=score,documentPageId&defType=func&q=tf%28text,amplifiers%29

I am following the syntax on other websites because I don’t know how to do it for the documentation on the wiki –> http://wiki.apache.org/solr/FunctionQuery

Answer 1

It won’t work, the function query tf(field, term) that you are attempting to use is not available in 3.5, browse through ValueSourceParser if you want to double-check. You need to get Solr 4.x nightly build – Solr Nightly Build from trunk & use it, but beware Solr 4.x is not stable & released yet, there will be a significant level of API changes compared to 3.5.

If you are interested in poking into the code, you could for instance, if you are using Maven modify pom.xml to get the atrifacts from Trunk and browse the source code starting from ValueSourceParser that should let you know if those relevance functions exist & how their implementation is.

For Ex: You will see parsers related to the term vector function queries,

 // From Solr 4 `ValueSourceParser` Trunk Source Code
 addParser("tf", new ValueSourceParser() {
    @Override
    public ValueSource parse(FunctionQParser fp) throws ParseException {
      TInfo tinfo = parseTerm(fp);
      return new TFValueSource(tinfo.field, tinfo.val, tinfo.indexedField, tinfo.indexedBytes);
    }
 });