Index: schema.php
===================================================================
--- schema.php	(revision 13173)
+++ schema.php	(working copy)
@@ -145,7 +145,8 @@
   PRIMARY KEY  (ID),
   KEY post_name (post_name),
   KEY type_status_date (post_type,post_status,post_date,ID),
-  KEY post_parent (post_parent)
+  KEY post_parent (post_parent),
+  KEY post_author (post_author)
 ) $charset_collate;
 CREATE TABLE $wpdb->users (
   ID bigint(20) unsigned NOT NULL auto_increment,