[tracker] Added a case that rasqal does itself, for clarity

[Philip Van Hoof <pvanhoof src gnome org>]

commit f57c154559e6dc576fea9487cf403a501052c308
Author: Philip Van Hoof <philip codeminded be>
Date:   Thu Jul 30 18:34:27 2009 +0200

    Added a case that rasqal does itself, for clarity

 src/libtracker-data/tracker-sparql-query.vala |    6 ++++++
 1 files changed, 6 insertions(+), 0 deletions(-)
---
diff --git a/src/libtracker-data/tracker-sparql-query.vala b/src/libtracker-data/tracker-sparql-query.vala
index 6c8ecf1..0636a87 100644
--- a/src/libtracker-data/tracker-sparql-query.vala
+++ b/src/libtracker-data/tracker-sparql-query.vala
@@ -1147,6 +1147,12 @@ public class Tracker.SparqlQuery : Object {
 					} else {
 						visit_filter (expr.arg1);
 					}
+				} else if (expr.arg1.literal.type == Rasqal.Literal.Type.URI) {
+					// Rasqal already takes care of this, but I added it here
+					// for the reader of this code to understand what goes on
+					// Note that rasqal will have converted a str(<urn:something>)
+					// to a literal string 'urn:something'
+					pattern_sql.append_printf ("'%s'", expr.arg1.literal.as_string ());
 				} else {
 					visit_filter (expr.arg1);
 				}