On Oct 8, 2012, at 10:12 PM, Richard Hipp <d...@sqlite.org> wrote:

> ALTER TABLE DROP COLUMN requires writing every row of the table.

Could be a 'logical delete' instead. In other words, a dictionary operation 
instead of a data one.

http://www.oracle-base.com/articles/8i/dropping-columns.php#LogicalDelete

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