public static <T_ROW> ColumnBuilder<T_ROW, String, Cell<String>> textColumnBuilder(
            final Function<T_ROW, String> valueExtractor) {
        return new ColumnBuilder<T_ROW, String, Cell<String>>(valueExtractor, TextCell::new);
    }
@return An integer percentage suffixed with '%' or '?'
stroom-core-client/src/main/java/stroom/util/client/DataGridUtil.java