[Xapian-tickets] [Xapian] #386: Use of match spies results in poor lower bound on number of results

[Xapian]

#386: Use of match spies results in poor lower bound on number of results
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 Reporter:  richard      |       Owner:  olly     
     Type:  defect       |      Status:  new      
 Priority:  normal       |   Milestone:           
Component:  Library API  |     Version:  SVN trunk
 Severity:  normal       |   Blockedby:           
 Platform:  All          |    Blocking:           
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 When a match spy is used, even if the match spy never returns false (to
 exclude a matching document), the lower bound on the number of results is
 reduced to the number of results actually seen.  This is necessary because
 Xapian has no way to know whether the match spy might exclude documents
 which haven't been seen.

 It would be nice for there to be a way to tell Xapian that a match spy
 will never exclude any documents from the search results; perhaps this
 could be a flag which can be read from the matchspy somehow, or perhaps it
 could be an option passed to enquire when the matchspy is set.

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Ticket URL: <http://trac.xapian.org/ticket/386>
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