[Xapian-tickets] [Xapian] #734: Returning MSet instead of sorted Docids after re-ranking

[Xapian]

#734: Returning MSet instead of sorted Docids after re-ranking
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        Reporter:  ayshtmr                   |      Owner:  ayshtmr
            Type:  enhancement               |     Status:  new
        Priority:  normal                    |  Milestone:
       Component:  Letor (Learning To Rank)  |    Version:  1.4.0
        Severity:  normal                    |   Keywords:  letor mset
      Blocked By:                            |   Blocking:
Operating System:  All                       |
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 With reference to discussion on the mailing list under thread
 [https://lists.xapian.org/pipermail/xapian-
 devel/2016-July/thread.html#2992 Letor: Returning MSet after re-ranking]

 `Letor::letor_rank(*)` method returns a sorted vector
 `vector<Xapian::docid>`. Ideally, it should return an MSet. This might
 require creating a `swap` method for two `MsetIterator` objects.

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Ticket URL: <https://trac.xapian.org/ticket/734>
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