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

Xapian nobody at xapian.org
Thu Sep 22 23:11:31 BST 2022

#215: Boolean OR could be optimised further
 Reporter:  Richard Boulton  |             Owner:  Vaibhav Kansagara
     Type:  enhancement      |            Status:  new
 Priority:  normal           |         Milestone:  1.4.x
Component:  Matcher          |           Version:  SVN trunk
 Severity:  minor            |        Resolution:
 Keywords:                   |        Blocked By:
 Blocking:                   |  Operating System:  All
Comment (by Olly Betts):

 > I'm not sure that it would lead to much improvement for common cases,
 but it is easy to make up cases where it would make a huge improvement
 (eg, a boolean OR in which one of the terms is a MatchAll term - none of
 the other postlists would need to be moved in this case.)

 While the optimisation here is worth trying, this particular case would
 actually be better handled by the query optimiser just reducing it to a
 MatchAll query.  I tested and that doesn't currently happen.

 Vaibhav: Are you still interested in working on this?  If not, we should
Ticket URL: <https://trac.xapian.org/ticket/215#comment:15>
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