Annotate should reset the cached information about columns
Annotate should reset the cached information about columns because Annotate may output old information if we load ActiveRecord::Base class in migration files.
For example, if we have a following migration file and execute 'rake db:migrate', Annote does not output the default value and a not null constraint of the `some_value` column.
```ruby
class CreatePosts < ActiveRecord::Migration
def change
create_table :posts do |t|
t.integer :some_value
end
# add a not null constraint to the some_value column
# should update some_value with not null values
# because records might exist which have null value in the some_value column
Post.update_all(some_value: 1)
change_column_null(:posts, :some_value, false)
change_column_default(:posts, :some_value, 1)
end
end
```
This commit fixes the above issue.
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