[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 boomboo):

 No the hit ratio is for the actual term to which the partial 'should'
 expand, eg. if my end query is "crocodile dundee" than I expect to get
 "dundee" as one of the terms for the partial expansion of "crocodile d".

 So we basically took all the queries the users submitted over a time (that
 yield results) and  checked how high does N need to be so that the last
 term is actually expanded to what they looked for.

 To test it I compiled a test build that also sorted (sort_heap) the terms
 before creating the query and we used a high max_wildcard_expansion, than
 parsed out the expanded terms out of get_description() and checked which
 place the term the user meant was at.

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Ticket URL: <http://trac.xapian.org/ticket/608#comment:6>
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