private <T> T getAnnotation(OperatorNode<?> ast, String key, Class<T> expectedClass,
                                T defaultValue, String description) {
        return getAnnotation(ast, key, expectedClass, defaultValue, description, true);
    }
The sorting specified in the YQL+ query last parsed.

@return a Sorting instance or null
container-search/src/main/java/com/yahoo/search/yql/YqlParser.java