Get the column change options.

def _get_column_change_options(self, fluent):
        """
        Get the column change options.
        """
        options = {
            "name": fluent.name,
            "type": self._get_dbal_column_type(fluent.type),
            "default": fluent.get("default"),
        }

        if fluent.type in ["string"]:
            options["length"] = fluent.length

        return options