Alterações na distribuição 3.21.26

FROM_DAYS(0) now returns '0000-00-00'.

• In DATE_FORMAT(), PM and AM were swapped for hours 00 and 12.
• Extended the default maximum key size to 256.
• Fixed bug when using BLOB/TEXT in GROUP BY with many tables.
• An ENUM field that is not declared NOT NULL has NULL as the default value. (Previously, the default value was the first enumeration value.)
• Fixed bug in the join optimiser code when using many part keys on the same key: INDEX (Organisation,Surname(35),Initials(35)).
• Added some tests to the table order optimiser to get some cases with SELECT ... FROM many_tables much faster.
• Added a retry loop around accept() to possibly fix some problems on some Linux machines.

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