[Xapian-tickets] [Xapian] #363: Avoid using the termlist when calculating percentages in get_mset()

[Xapian]

#363: Avoid using the termlist when calculating percentages in get_mset()
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 Reporter:  richard  |       Owner:  richard  
     Type:  defect   |      Status:  new      
 Priority:  normal   |   Milestone:  1.1.1    
Component:  Matcher  |     Version:  SVN trunk
 Severity:  normal   |   Blockedby:           
 Platform:  All      |    Blocking:  181      
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 Currently, get_mset() uses the termlist for assigning percentages; it
 iterates through the termlist looking up the weight for each term in it
 and in the query, and adding them together to get a value for the weight
 for 100%.

 This requires an access to the termlist (which can be quite costly) and
 also doesn't work correctly for synonyms, since these aren't in the
 termlist.

 This could be avoided by keeping track of which Xapian::Weight::Internal
 objects were used for the best msetitem, or just of the sum of the
 termweights for these.

 This information would need to be serialised along with the MSet.

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Ticket URL: <http://trac.xapian.org/ticket/363>
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