[Xapian-tickets] [Xapian] #608: as_partial_query / as_wildcarded_query and limiting the expansion of terms

[Xapian]

#608: as_partial_query / as_wildcarded_query and limiting the expansion of terms
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 Reporter:  boomboo      |       Owner:  olly    
     Type:  enhancement  |      Status:  assigned
 Priority:  normal       |   Milestone:  1.3.2   
Component:  QueryParser  |     Version:          
 Severity:  normal       |    Keywords:          
Blockedby:               |    Platform:  All     
 Blocking:               |  
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Comment(by olly):

 To check I'm following, that "84% hit ratio" is of the documents which
 would be matched when completing to the most frequent N terms with the
 prefix rather than to all terms with the prefix?

 That's certainly useful information, though it might be that returning all
 the documents which the full expansion would isn't actually the target to
 be aiming for - we want to return documents matching what the user is
 looking for, and it seems likely that the frequencies of occurrence of
 terms in queries is going to be roughly the same as in documents, so the
 word they are in the middle of typing is more likely to be one with a
 higher termfreq.  But that's harder to evaluate (you'd need some sort of
 user relevance assessments, rather than just counting the matches).  100
 seems a plausible choice anyway.

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Ticket URL: <http://trac.xapian.org/ticket/608#comment:5>
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