[tracker] TrackerMinerFS: Improve performance on move operations.

[Carlos Garnacho <carlosg src gnome org>]

commit bfe6c730847653b0d746d3281c6a708144d2cd7a
Author: Carlos Garnacho <carlosg gnome org>
Date:   Wed Mar 17 12:59:45 2010 +0100

    TrackerMinerFS: Improve performance on move operations.
    
    The query to obtain all directory children in item_update_children_uri()
    now takes ~1s when moving Linux sources, as opposed to >9min with OPTIONAL.

 src/libtracker-miner/tracker-miner-fs.c |    5 +----
 1 files changed, 1 insertions(+), 4 deletions(-)
---
diff --git a/src/libtracker-miner/tracker-miner-fs.c b/src/libtracker-miner/tracker-miner-fs.c
index 9c1f43c..6fedc12 100644
--- a/src/libtracker-miner/tracker-miner-fs.c
+++ b/src/libtracker-miner/tracker-miner-fs.c
@@ -1456,11 +1456,8 @@ item_update_children_uri (TrackerMinerFS    *fs,
 
 	slash_uri = g_strconcat (source_uri, "/", NULL);
 
-	sparql = g_strdup_printf ("SELECT ?child ?url ?m WHERE { "
+	sparql = g_strdup_printf ("SELECT ?child ?url nie:mimeType(?child) WHERE { "
 				  "  ?child nie:url ?url . "
-				  "  OPTIONAL { "
-				  "    ?child nie:mimeType ?m "
-				  "  } . "
 				  "  FILTER (fn:starts-with (?url, \"%s\")) "
 				  "}",
 				  slash_uri);