force cl_sortkey index

diff --git a/includes/CategoryPage.php b/includes/CategoryPage.php
index 7fd3dbb..356f9ea 100644 (file)
--- a/includes/CategoryPage.php
+++ b/includes/CategoryPage.php
@@ -202,6 +202,7 @@ class CategoryViewer {
                        #+ $pageCondition,
                        __METHOD__,
                        array( 'ORDER BY' => $this->flip ? 'cl_sortkey DESC' : 'cl_sortkey',
+                              'USE INDEX' => 'cl_sortkey', 
                               'LIMIT'    => $this->limit + 1 ) );
 
                $count = 0;