default boolean isSortingCurrentlyActive() {
        return getSortByAsMap().values().stream().anyMatch(SortMeta::isActive);
    }
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