--- aggregator.views.inc.orig	2013-11-19 17:14:55.664542687 +0900
+++ aggregator.views.inc	2013-11-19 17:14:36.554549588 +0900
@@ -324,19 +324,33 @@
   // Aggregator category feed table
 
   $data['aggregator_category_feed']['table']['join'] = array(
-    'aggregator_item' => array(
+    'aggregator_feed' => array(
       'left_field' => 'fid',
       'field' => 'fid',
     ),
   );
 
   // ----------------------------------------------------------------------
+  // Aggregator category item table
+  $data['aggregator_category_item']['table']['join'] = array(
+    'aggregator_item' => array(
+      'left_field' => 'iid',
+      'field' => 'iid',
+    ),
+  );
+  
+  // ----------------------------------------------------------------------
   // Aggregator category table
 
   $data['aggregator_category']['table']['group'] = t('Aggregator category');
 
   $data['aggregator_category']['table']['join'] = array(
     'aggregator_item' => array(
+        'left_table' => 'aggregator_category_item',
+        'left_field' => 'cid',
+        'field' => 'cid',
+    ),
+    'aggregator_feed' => array(
       'left_table' => 'aggregator_category_feed',
       'left_field' => 'cid',
       'field' => 'cid',