private List<Continuation> getContinuations(String param) {
        if (param == null) {
            return List.of();
        }
        List<Continuation> ret = new LinkedList<>();
        for (String str : param.split(" ")) {
            ret.add(Continuation.fromString(str));
        }
        return ret;
    }
This searcher is responsible for turning the "select" parameter into a corresponding {@link GroupingRequest}. It will
also parse any "timezone" parameter as the timezone for time expressions such as {@link
com.yahoo.search.grouping.request.DayOfMonthFunction} and {@link com.yahoo.search.grouping.request.HourOfDayFunction}.

@author Simon Thoresen Hult
container-search/src/main/java/com/yahoo/search/grouping/GroupingQueryParser.java