private <T> OrderField<T> asOrderField(final Field<T> field, final boolean isDesc) {
        return isDesc
                ? field.desc()
                : field;
    }
@param additionalFieldMappings Any additional field name to {@link Field} mappings. Can be null.
stroom-security/stroom-security-impl-db/src/main/java/stroom/security/impl/db/UserDaoImpl.java