Hi,
I have use cases of features which require a query function and some more
math on top of the result of the query function
Eg of a feature : no of extra terms in the document from input text
I am trying various ways of representing this feature but always getting an
exception
java.lang.RuntimeException: Exception from createWeight for SolrFeature
<feature>. Failed to parse feature query.
Feature representations
"name" : "no_of_extra_terms",
"class" : "org.apache.solr.ltr.feature.SolrFeature",
"params": {
"q": "{!func}sub(num_tokens_int,query({!dismax
qf=field_name}${text}))"
},
where num_tokens_int is a stored field which contains no of tokens in the
document
Also, feature representation with just a query parser like
"q": "{!dismax df=field_name}${text}"
works but I can't really getting my desired feature representation without
using it in a function query where i want to operate on the result of this
query to derive my actual feature
