Mulgara

This particular query never returns in Mulgara 2.1.3

In Mulgara 2.0.9 it, correctly, returns with no results under one minute.

Same database was used for testing.

select $art $oqltmp1_1 $score0 from <local:///topazproject#prefix> 
where $art <rdf:type> <http://rdf.topazproject.org/RDF/Article> in <local:///topazproject#filter:graph=ri> 
and $art <http://purl.org/dc/terms/bibliographicCitation> $oqltmp2_2 in <local:///topazproject#filter:graph=ri> 
and $oqltmp2_2 <http://rdf.plos.org/RDF/hasEditorList> $oqltmp2_3 in <local:///topazproject#filter:graph=ri> 
and $oqltmp2_4 <mulgara:prefix> <rdf:_> in <local:///topazproject#prefix> 
and $oqltmp2_3 $oqltmp2_4 $oqltmp2_1 in <local:///topazproject#filter:graph=ri> 
and $oqltmp2_1 <mulgara:search> $oqltmp2_7fs in <local:///topazproject#lucene> 
and $oqltmp2_7fs <http://xmlns.com/foaf/0.1/name> '"niyaz ahmed"' in <local:///topazproject#lucene> 
and $oqltmp2_7fs <mulgara:score> $score0 in <local:///topazproject#lucene> 
and $art <http://prismstandard.org/namespaces/1.2/basic/eIssn> $oqltmp1_1 in <local:///topazproject#filter:graph=ri>;