Hi. Where did you find such an obtuse example?
Recently, Solr supports sorting by function query. One such function is
named "query" which takes a query and uses the score of the result of that
query as the function's result. Due to constraints of where this query is
placed within a function query, it is necessary to use the local-params
syntax (e.g. {!v=...}) since you can't simply state "category:445". Or,
there could have been a parameter dereference like $sortQ where sortQ is
another parameter holding category:445. Any way, the net effect is that
documents are score-sorted based on the query category:445 instead of the
user-query ("q" param). I'd expect category:445 docs to come up top and all
others to appear randomly afterwards. It would be nice if the sort query
could simply be "category:445 desc" but that's not supported.
Complicated? You bet! But fear not; this is about as complicated as it
gets.
References:
http://wiki.apache.org/solr/SolrQuerySyntax
http://wiki.apache.org/solr/CommonQueryParameters#sort
http://wiki.apache.org/solr/FunctionQuery#query
~ David Smiley
Author: https://www.packtpub.com/solr-1-4-enterprise-search-server/book
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Author: https://www.packtpub.com/solr-1-4-enterprise-search-server/book
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