default String getColumnsWidthForClientSide() {
        return getColumnMeta().entrySet()
                .stream()
                .filter(e -> LangUtils.isNotBlank(e.getValue().getWidth()))
                .map(e -> e.getKey() + '_' + e.getValue().getWidth())
                .collect(Collectors.joining(","));
    }
Returns actives sort meta. See {@link SortMeta#compareTo(SortMeta)}
@return map with {@link SortMeta#getField()} as key and {@link SortMeta} as value
primefaces/src/main/java/org/primefaces/component/api/UITable.java