[Xapian-tickets] [Xapian] #215: Boolean OR could be optimised further

[Xapian]

#215: Boolean OR could be optimised further
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 Reporter:  richard      |        Owner:  olly    
     Type:  enhancement  |       Status:  new     
 Priority:  normal       |    Milestone:          
Component:  Matcher      |      Version:  SVN HEAD
 Severity:  minor        |   Resolution:          
 Keywords:               |    Blockedby:          
 Platform:  All          |     Blocking:          
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Comment(by richard):

 PostingSource has a get_maxweight() method - if this returns 0, or if the
 PostingSource is under a "OP_MULT_WEIGHT 0" (or the boolean part of an
 OP_FILTER), we can ignore the weights returned by it. I don't see why it
 would be any harder to do this with weights from an external source,
 therefore.

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Ticket URL: <http://trac.xapian.org/ticket/215#comment:5>
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