sql file about the length of the cl_sortkey_prefix field, per comment on CR
by Nikerabbit.
-- concatenated with a null followed by the page title before the sortkey
-- conversion algorithm is run. We store this so that we can update
-- collations without reparsing all pages.
+ -- Note: If you change the length of this field, you also need to change
+ -- code in LinksUpdate.php. See bug 25254.
cl_sortkey_prefix varchar(255) binary NOT NULL default '',
-- This isn't really used at present. Provided for an optional