@Override
    protected RowMapper<Map<String, Object>> getRowMapper() {
        return MAPPER;
    }
{@link Map} of columns from a name column to value columns.
Keys are Strings, Values are Strings or Set of Strings.
support/cas-server-support-jdbc-authentication/src/main/java/org/apereo/cas/jdbc/MultiRowJdbcPersonAttributeDao.java