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Re: Accessing more partitions than needed
Posted by: Mattias Jonsson
Date: July 19, 2012 05:23AM

This is a known 'gotcha' and is due to the fact that to_days() will return NULL for non-valid dates (like 2012-04-31) so it always need to search the first partition (where all NULL values are stored). (See bug#49754).

I would suggest you to try 'PARTITION BY RANGE COLUMNS (cdate)' (in MySQL 5.5) instead.

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