Obtains DBMS specific SQL code portion needed to set an index
        declaration to be used in statements like CREATE TABLE.

        :param fields: The columns
        :type fields: list

        :rtype: sql

def get_index_field_declaration_list_sql(self, fields):
        """
        Obtains DBMS specific SQL code portion needed to set an index
        declaration to be used in statements like CREATE TABLE.

        :param fields: The columns
        :type fields: list

        :rtype: sql
        """
        ret = []

        for field in fields:
            ret.append(field)

        return ", ".join(ret)