[Xapian-tickets] [Xapian] #268: Review ValueWeightPostingSource, possibly replace with a query operator

[Xapian]

#268: Review ValueWeightPostingSource, possibly replace with a query operator
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 Reporter:  richard      |       Owner:  olly    
     Type:  defect       |      Status:  new     
 Priority:  normal       |   Milestone:  1.1.0   
Component:  Library API  |     Version:  SVN HEAD
 Severity:  normal       |    Keywords:          
Blockedby:               |    Platform:  All     
 Blocking:               |  
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 External PostingSources have at least two annoying limitations (don't work
 with remote databases, don't work well with multi databases).

 The newly added ValueWeightPostingSource simply reads a value slot,
 returns documents with a non empty value, and returns the weight obtained
 by applying sortable_unserialise to the slot.  Therefore, it could be
 implemented instead by a query operator, which would be similar to the
 existing OP_VALUE_... operators.  This would make the feature available
 with remote databases and multi databases.

 There may be a cleaner alternative which we haven't thought of yet, too.

 Marking this for 1.1.0, since ValueWeightPostingSource isn't yet in the
 API for any release, and we should remove it before making a release if
 we're going to remove it at all.

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Ticket URL: <http://trac.xapian.org/ticket/268>
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