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Re: first partition always
Posted by: Aftab Khan
Date: August 11, 2010 05:44AM

since TO_DAYS() returns NULL values for dates, it must also search the first partition to see if any have occurred. This is why you see it matching 2010_08_01 in the explain, since NULL is considered less than any other positive integer.

You could create a special partition like:

PARTITION invalid_dates VALUES LESS THAN (0)

http://bugs.mysql.com/bug.php?id=49754

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