@Override
        boolean serialize(StringBuilder destination, NumericInItem item) {
            destination.append(item.getIndexName()).append(" in (");
            int initLen = destination.length();
            List<Long> tokens = new ArrayList<>(item.getTokens());
            Collections.sort(tokens);
            for (var token : tokens) {
                comma(destination, initLen);
                destination.append(token.toString());
                if (token < Integer.MIN_VALUE || token > Integer.MAX_VALUE)
                    destination.append("L");
            }
            destination.append(")");
            return false;
        }
Serialize Vespa query trees to YQL+ strings.

@author Steinar Knutsen
container-search/src/main/java/com/yahoo/search/yql/VespaSerializer.java