I'm trying to execute a simply change_column on oracle, with the
following output:
-- change_column(:comments, :text, :string, {:limit=>1000})
rake aborted!
An error has occurred, this and all later migrations canceled:

Index name
'temp_index_altered_comments_on_commentable_id_and_commentable_type'
on table 'altered_comments' is too long; the limit is 64 characters

How do I specify the name of the temporary index in the migration?

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