add_index problems

Hi all,

I think there's a bug in rake db:schema:dump.

Try to add in your migration
execute 'ALTER TABLE posts ADD UNIQUE (description(15))'

and rake db:schema:load : it just converts it to
add_index "posts", ["description"], :name => "description", :unique =>
true

The point is that MySQL will crash when you'll try rake your tests.
Assuming description is a 'text', you need to specify length of the
index.

Am I wrong? Does someone can reproduce the bug?