NFO, libtracker-miner: Major performance improvement for crawler

data/ontologies/33-nfo.ontology

@@ -12,7 +12,7 @@
 
 nfo: a tracker:Namespace, tracker:Ontology ;
 	tracker:prefix "nfo" ;
-	nao:lastModified "2010-04-22T13:12:00Z" .
+	nao:lastModified "2010-04-30T16:12:00Z" .
 
 nfo:Document a rdfs:Class ;
 	rdfs:label "Document" ;
@@ -330,6 +330,7 @@ nfo:belongsToContainer a rdf:Property ;
 	rdfs:subPropertyOf nie:isPartOf ;
 	nrl:maxCardinality 1 ;
 	rdfs:domain nie:DataObject ;
+	tracker:indexed true ;
 	rdfs:range nfo:DataContainer .
 
 nfo:aspectRatio a rdf:Property ;

src/libtracker-miner/tracker-miner-fs.c

@@ -2182,11 +2182,11 @@ ensure_mtime_cache (TrackerMinerFS *fs,
 
 	g_debug ("Generating mtime cache for folder: %s", uri);
 
-	query = g_strdup_printf ("SELECT ?uri nfo:fileLastModified (?u) { "
-	                         "  ?u nie:url ?uri . "
-	                         "  FILTER (tracker:uri-is-parent (\"%s\", ?uri)) "
-	                         "}",
-	                         uri);
+	query = g_strdup_printf ("SELECT ?url ?last { ?u nfo:belongsToContainer ?p ; "
+	                                                "nie:url ?url ; "
+	                                                "nfo:fileLastModified ?last . "
+	                                             "?p nie:url '%s' }", uri);
+
 	g_free (uri);
 
 	data.main_loop = g_main_loop_new (NULL, FALSE);