[Xapian-tickets] [Xapian] #663: Make ValueRangeProcessor return a Query object

[Xapian]

#663: Make ValueRangeProcessor return a Query object
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        Reporter:  olly         |      Owner:  olly
            Type:  enhancement  |     Status:  new
        Priority:  normal       |  Milestone:  1.3.3
       Component:  QueryParser  |    Version:  SVN trunk
        Severity:  normal       |   Keywords:
      Blocked By:               |   Blocking:
Operating System:  All          |
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 Currently VRP takes two strings by reference, potentially modifies them,
 and returns a value slot number.

 It would be more flexible and easier to wrap for the bindings if it took
 two strings by const reference and returned a Query object instead.
 There's an example in the getting started guide suggesting adding boolean
 terms to restrict the number of docs a VRP has to consider, but this
 doesn't really work as you can't insert an OP_FILTER for such terms at the
 right place in the query tree - this change would allow that to work
 nicely.

 We could provide this in 1.4 by having two overloaded virtual forms of the
 {{{operator()()}}} method with the existing and new signature, and have a
 default implementation of the new method which calls the old.
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Ticket URL: <http://trac.xapian.org/ticket/663>
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