default SortMeta getHighestPriorityActiveSortMeta() {
        return getSortByAsMap().values().stream()
                .filter(SortMeta::isActive)
                .min(Comparator.comparingInt(SortMeta::getPriority))
                .orElse(null);
    }
Returns actives filter meta.
@return map with {@link FilterMeta#getField()} as key and {@link FilterMeta} as value
primefaces/src/main/java/org/primefaces/component/api/UITable.java