Index: wp-admin/includes/schema.php
===================================================================
--- wp-admin/includes/schema.php	(revision 37053)
+++ wp-admin/includes/schema.php	(working copy)
@@ -187,7 +187,8 @@
   KEY post_name (post_name($max_index_length)),
   KEY type_status_date (post_type,post_status,post_date,ID),
   KEY post_parent (post_parent),
-  KEY post_author (post_author)
+  KEY post_author (post_author),
+  KEY post_type_mime_type (post_type, post_mime_type(10))
 ) $charset_collate;\n";
 
 	// Single site users table. The multisite flavor of the users table is handled below.
Index: wp-includes/version.php
===================================================================
--- wp-includes/version.php	(revision 37053)
+++ wp-includes/version.php	(working copy)
@@ -11,7 +11,7 @@
  *
  * @global int $wp_db_version
  */
-$wp_db_version = 36686;
+$wp_db_version = 36687;
 
 /**
  * Holds the TinyMCE version