public static FilterFieldDefinition qualifiedField(final String displayName) {
        return new FilterFieldDefinition(displayName, toQualifiedName(displayName), false);
    }
@param displayName The display name or column heading for the field in the table. The lowercase
                   form of the display name (without punctuation) will be used for the field
                   qualifier, e.g. First Name => firstname
stroom-util-shared/src/main/java/stroom/util/shared/filter/FilterFieldDefinition.java