Search::Xapian::MultiValueSorter - allows sorting by a several values.

       Results are ordered by the first value.  In the event of a tie, the second is used.  If this is the same
       for both, the third is used, and so on.

       new [<value>...]
           Construct and add the values listed.

       add <value> [<forward>]
           Add  another  value to sort on.  By default, values sort forwards, unless forward is specified and is
           false.

       Search::Xapian::MultiValueSorter - allows sorting by a several values.

         https://xapian.org/docs/sourcedoc/html/classXapian_1_1MultiValueSorter.html

perl v5.40.0                                       2024-10-20                      Xapian::MultiValueSorter(3pm)

         use Search::Xapian;

         my $db = new Search::Xapian::Database("/path/to/db");
         my $enq = new Search::Xapian::Enquire($db);
         my $sorter = new Search::Xapian::MultiValueSorter(1, 3, 5);
         $enq->set_sort_by_key($sorter);