[typo] Upgade errors

[Tobias Luetke]

> One thing that we need to add is a
> requirement for the user to restart their fastcgi servers after
> finishing the migrations; without doing that, the migration won't be
> complete and random errors will occur.

I think we could traverse the ObjectSpace and call
reset_column_information for all objects which respond to it. This
might fix the issue.

>  From where I'm sitting, this is the last really big thing between us
> and 2.5.

Absolutely. 

-- 
Tobi
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