[tracker] NFO, libtracker-miner: Major performance improvement for crawler

[Philip Van Hoof <pvanhoof src gnome org>]

commit 4890d1c2f0a561a9d4aa746008c64ecde386ce42
Author: Philip Van Hoof <philip codeminded be>
Date:   Fri Apr 30 16:10:37 2010 +0200

    NFO, libtracker-miner: Major performance improvement for crawler

 data/ontologies/33-nfo.ontology         |    3 ++-
 src/libtracker-miner/tracker-miner-fs.c |   10 +++++-----
 2 files changed, 7 insertions(+), 6 deletions(-)
---
diff --git a/data/ontologies/33-nfo.ontology b/data/ontologies/33-nfo.ontology
index 016941e..a74d132 100644
--- a/data/ontologies/33-nfo.ontology
+++ b/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 ;
diff --git a/src/libtracker-miner/tracker-miner-fs.c b/src/libtracker-miner/tracker-miner-fs.c
index 419e6f4..9127886 100644
--- a/src/libtracker-miner/tracker-miner-fs.c
+++ b/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);