A working "progress bar" for a huge ALTER TABLE

A working "progress bar" for a huge ALTER TABLE: "My friend Gabriel came up with a working 'progress bar' for ALTER TABLE. Until MySQL / Drizzle can do this 'natively', this is a pretty neat trick:

http://gabrielcain.com/blog/2009/08/05/mysql-alter-table-and-how-to-observe-progress/
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