public String asYqlString() {
            if (strValue != null) {
                return String.format("\"%s\":\"%s\"", key, strValue);
            } else {
                return String.format("\"%s\":%dl", key, longValue);
            }
        }
Converts a targeting query (the format provided by targeting team) into a file of Vespa queries formatted as URLs.

The format is the following:
- Each line represents one bulk query (upto 64 subqueries)
- Each bulk query has a set of subqueries separated by ";"
- Each subquery is of the format: attrName\tattrValue\tsubqueryIndex\tisRangeTerm;
- Some attributes have no value.
- Value may contain ";"

@author bjorncs
predicate-search/src/main/java/com/yahoo/search/predicate/utils/TargetingQueryFileConverter.java