Ticket #9009: 9009.diff

wp-includes/post.php

@@ -684 +684 @@
                 return false;
 
         global $wpdb;
-        if ( $wpdb->query($wpdb->prepare("DELETE FROM $wpdb->postmeta WHERE meta_key = %s", $post_meta_key)) ) {
-                /** @todo Get post_ids and delete cache */
-                // wp_cache_delete($post_id, 'post_meta');
+        $post_ids = $wpdb->get_col($wpdb->prepare("SELECT DISTINCT post_id FROM $wpdb->postmeta WHERE meta_key = %s", $post_meta_key));
+        if ( $post_ids ) {
+                $wpdb->query($wpdb->prepare("DELETE FROM $wpdb->postmeta WHERE meta_key = %s", $post_meta_key));
+                foreach ( $post_ids as $post_id )
+                        wp_cache_delete($post_id, 'post_meta');
                 return true;
         }
         return false;