Get the dbal column type.

        :param type_: The fluent type
        :type type_: str

        :rtype: str

def _get_dbal_column_type(self, type_):
        """
        Get the dbal column type.

        :param type_: The fluent type
        :type type_: str

        :rtype: str
        """
        type_ = type_.lower()

        if type_ == "big_integer":
            type_ = "bigint"
        elif type == "small_integer":
            type_ = "smallint"
        elif type_ in ["medium_text", "long_text"]:
            type_ = "text"

        return type_