MySQL Manual | D.5.28 Changes in release 3.22.8

Czech character sets should now work much better. You must also install http://www.mysql.com/Downloads/Patches/czech-3.22.8-patch. This patch should also be installed if you are using a character set which uses my_strcoll()! The patch should always be safe to install (for any system), but as this patch changes ISAM internals it's not yet in the default distribution.
DATE_ADD() and DATE_SUB() didn't work with group functions.
mysql will now also try to reconnect on USE database commands.
Fix problem with ORDER BY and LEFT JOIN and const tables.
Fixed problem with ORDER BY if the first ORDER BY column was a key and the rest of the ORDER BY columns wasn't part of the key.
Fixed a big problem with OPTIMIZE TABLE.
MySQL clients on NT will now by default first try to connect with named pipes and after this with TCP/IP.
Fixed a problem with DROP TABLE and mysqladmin shutdown on Windows (a fatal bug from 3.22.6).
Fixed problems with TIME columns and negative strings.
Added an extra thread signal loop on shutdown to avoid some error messages from the client.
MySQL now uses the next available number as extension for the update log file.
Added patches for UNIXWARE 7.

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