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https://issues.apache.org/jira/browse/SOLR-12698?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16675742#comment-16675742
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Christine Poerschke commented on SOLR-12698:
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bq. ... the intention to introduce both q(which is supposed to be a function
query) and fq parameter for the same SolrFeature at all(Is there a case when
they will be used together ? ), ...
A fair question. We could probably document this better, somehow. The
[SolrFeature
javadocs|http://lucene.apache.org/solr/7_5_0/solr-ltr/org/apache/solr/ltr/feature/SolrFeature.html]
currently only say "... The value of the feature will be the score of the
given query for the current document. ..." and although the example
configurations have both {{fq}} and {{q}} (individually) it's unstated when one
might wish to use which or both. In essence (as far as a i recall) like with
the [fq query
parameter|https://lucene.apache.org/solr/guide/7_5/common-query-parameters.html#fq-filter-query-parameter]
itself the {{fq}} in {{SolrFeature}} can be used to restrict which documents
score non-zero but without influencing the document score itself.
> SolrFeature: no-fq optimisation
> -------------------------------
>
> Key: SOLR-12698
> URL: https://issues.apache.org/jira/browse/SOLR-12698
> Project: Solr
> Issue Type: Sub-task
> Security Level: Public(Default Security Level. Issues are Public)
> Components: contrib - LTR
> Reporter: Stanislav Livotov
> Priority: Major
> Attachments: SOLR-12698.patch
>
>
> [~slivotov] wrote in SOLR-12688:
> bq. ... SolrFeature was not optimally implemented for the case when no fq
> parameter was passed. I'm not absolutely sure what was the intention to
> introduce both q(which is supposed to be a function query) and fq parameter
> for the same SolrFeature at all(Is there a case when they will be used
> together ? ), so I decided not to change behavior but just optimize described
> case ...
> (Please see SOLR-12688 description for overall context and analysis results.)
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