Schema: Increase the length of wp_options.option_name.

It's pretty easy to run over the `option_name` length, which causes undefined behaviour when inserting and retrieving options. Increasing the length from `VARCHAR(64)` to `VARCHAR(191)` significantly reduces the risk of this occurring.

Because `option_name` has a `UNIQUE` index, we can only increase it to 191 characters, rather than 255. The index can only use a prefix of 191 characters, so will incorrectly restrict long different strings that have the same prefix, if we make the column longer.

Props scribu, OriginalEXE, khromov, MikeHansenMe, netweb, pento.

Fixes #13310.


Built from https://develop.svn.wordpress.org/trunk@34030


git-svn-id: http://core.svn.wordpress.org/trunk@33999 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-admin/includes/schema.php

@@ -135,7 +135,7 @@ CREATE TABLE $wpdb->links (
 ) $charset_collate;
 CREATE TABLE $wpdb->options (
   option_id bigint(20) unsigned NOT NULL auto_increment,
-  option_name varchar(64) NOT NULL default '',
+  option_name varchar(191) NOT NULL default '',
   option_value longtext NOT NULL,
   autoload varchar(20) NOT NULL default 'yes',
   PRIMARY KEY  (option_id),