[tracker] Fixed property functions to support resource variables

[Philip Van Hoof <pvanhoof src gnome org>]

commit c2aec003d0b6ff87831609b966bf079ddd806949
Author: Philip Van Hoof <philip codeminded be>
Date:   Wed Dec 9 14:03:16 2009 +0100

    Fixed property functions to support resource variables

 src/libtracker-data/tracker-sparql-query.vala |    6 +++++-
 1 files changed, 5 insertions(+), 1 deletions(-)
---
diff --git a/src/libtracker-data/tracker-sparql-query.vala b/src/libtracker-data/tracker-sparql-query.vala
index d7b981f..f085646 100644
--- a/src/libtracker-data/tracker-sparql-query.vala
+++ b/src/libtracker-data/tracker-sparql-query.vala
@@ -1364,7 +1364,11 @@ public class Tracker.SparqlQuery : Object {
 			}
 
 			if (prop.multiple_values) {
-				sql.append_printf ("(SELECT GROUP_CONCAT(\"%s\",',') FROM \"%s_%s\" WHERE ID = ", prop.name, prop.domain.name, prop.name);
+				sql.append ("(SELECT GROUP_CONCAT(");
+				long begin = sql.len;
+				sql.append_printf ("\"%s\"", prop.name);
+				convert_expression_to_string (sql, prop.data_type, begin);
+				sql.append_printf (",',') FROM \"%s_%s\" WHERE ID = ", prop.domain.name, prop.name);
 				translate_expression (sql);
 				sql.append (")");