Koha::QueryParser::Driver::PQF::query_plan::modifer - modifier subclass for PQF driver
my $pqf = $modifier->target_syntax($server, $query_plan);
Transforms an OpenILS::QueryParser::query_plan::modifier object into PQF. Do not use directly. The second argument points ot the query_plan, since modifiers do not have a reference to their parent query_plan.