Fixed security problem that password was temporarly reset when someone changed GRANT for a user. (Bug #3404)
Fixed problem with PROCEDURE analyse() and impossible WHERE (Bug #2238)
Don't auto-repair tables in mysqlcheck if table type doesn't support 'check' command.
New faster list iterators
Change list code to be simpler and faster
Optimize count(distinct)
New error messages for UNION
Make create_tmp_table more general to be usable by UNION