rename_enum

# File activerecord/lib/active_record/connection_adapters/postgresql_adapter.rb, line 563
      def rename_enum(name, options = {})
        to = options.fetch(:to) { raise ArgumentError, ":to is required" }

        exec_query("ALTER TYPE #{quote_table_name(name)} RENAME TO #{to}").tap { reload_type_map }
      end