private static DualValComparatorFactory create(final Comparator<Val> caseSensitiveComparator,
                                                       final Comparator<Val> caseInsensitiveComparator) {
            return new DualValComparatorFactory(caseSensitiveComparator, caseInsensitiveComparator);
        }
@return True if neither value has a decimal part.
stroom-query/stroom-query-language/src/main/java/stroom/query/language/functions/ValComparators.java