public static <T_ROW, T_CELL_VAL, T_CELL extends Cell<T_CELL_VAL>> ColumnBuilder<
            T_ROW, T_CELL_VAL, T_CELL> columnBuilder(
            final Function<T_ROW, T_CELL_VAL> valueExtractor,
            final Supplier<T_CELL> cellSupplier) {
        return new ColumnBuilder<T_ROW, T_CELL_VAL, T_CELL>(valueExtractor, cellSupplier);
    }
@return An integer percentage suffixed with '%' or '?'
stroom-core-client/src/main/java/stroom/util/client/DataGridUtil.java