Improve speed of user feed

Test Plan: /p/x/feed/

Reviewers: epriestley

Reviewed By: epriestley

CC: aran

Maniphest Tasks: T1099

Differential Revision: https://secure.phabricator.com/D2176

src/applications/feed/query/PhabricatorFeedQuery.php

@@ -92,8 +92,8 @@ final class PhabricatorFeedQuery {
       'SELECT story.* FROM %T ref
         JOIN %T story ON ref.chronologicalKey = story.chronologicalKey
         %Q
-        GROUP BY story.chronologicalKey
-        ORDER BY story.chronologicalKey %Q
+        GROUP BY ref.chronologicalKey
+        ORDER BY ref.chronologicalKey %Q
         LIMIT %d',
       $ref_table->getTableName(),
       $story_table->getTableName(),