/**
* Get the set of fields from the filter's field ordering which were omitted due to being empty.
*
* @return the set of empty fields which were omitted from the ordering
*/
public Set<Field> getOmittedEmptyFields() {
Set<Field> empties = EnumSet.copyOf(columnOrdering.getFields());
empties.retainAll(emptyFields);
return empties;
}
