[Xapian-tickets] [Xapian] #418: wildcard search in omega

Xapian nobody at xapian.org
Thu Dec 10 01:17:39 GMT 2009


#418: wildcard search in omega
-------------------------+--------------------------------------------------
 Reporter:  do           |       Owner:  olly  
     Type:  enhancement  |      Status:  new   
 Priority:  normal       |   Milestone:  1.2.x 
Component:  Omega        |     Version:  1.0.17
 Severity:  normal       |    Keywords:        
Blockedby:               |    Platform:  All   
 Blocking:               |  
-------------------------+--------------------------------------------------
Changes (by olly):

  * milestone:  => 1.2.x


Comment:

 Omega really needs a generic way to set (or clear) !QueryParser flags.  We
 can cleanly add that in 1.2.x without breaking compatibility, so setting
 the milestone.

 We can't ''"just search by prefix"'' as we don't have an index which tells
 us all the documents which match a given term prefix.  So we have to merge
 the posting lists for all the terms that the wildcard expands to.

 It is possible to keep an index for term prefixes to accelerate wildcard
 expansions (see #207), but that will take significantly more space.  For
 most users that probably isn't worthwhile so it's likely to be an index-
 time choice.

-- 
Ticket URL: <http://trac.xapian.org/ticket/418#comment:1>
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