Omit the `ORDER BY` clause when updating object term cache.

The `ORDER BY` clause was forcing filesorts on large tables, and is
unnecessary, since term order doesn't matter when updating the cache.

Props mbrandys, wonderboymusic.
Fixes #28922.
Built from https://develop.svn.wordpress.org/trunk@34217


git-svn-id: http://core.svn.wordpress.org/trunk@34181 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-includes/taxonomy-functions.php

@@ -3274,7 +3274,10 @@ function update_object_term_cache($object_ids, $object_type) {
 	if ( empty( $ids ) )
 		return false;
 
-	$terms = wp_get_object_terms($ids, $taxonomies, array('fields' => 'all_with_object_id'));
+	$terms = wp_get_object_terms( $ids, $taxonomies, array(
+		'fields' => 'all_with_object_id',
+		'orderby' => 'none',
+	) );
 
 	$object_terms = array();
 	foreach ( (array) $terms as $term )

wp-includes/version.php

@@ -4,7 +4,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '4.4-alpha-34216';
+$wp_version = '4.4-alpha-34217';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.