Martijn Faassen wrote at 2007-3-15 18:04 +0100: > ... >It would be very nice if someone could look into expanding hurry.query >and/or the catalog to support these cases. It would be interesting to >look at what Dieter Maurer has done with AdvancedQuery in Zope 2 in this >regard as well.
AdvancedQuery performs the query (without considering any sorting) and then tries to use known sortedness properties of the sort index[es] to sort the result set lazily. It can gain significantly only when the size of the sort index is considerably smaller than the result set (this usually is the case for narrow (e.g. classification) indexes and not the case for broad (e.g. date) indexes). In the (very) special case that the ranking criteria only depends on the objects and not on the query (Google's ranking by document interconnectivity might be an example; rank by recency is another one), the object rank can be incorporated directly in the indexes and then "IncrementalSearch" may maximally exploit lazy (incremental) access to the result set. -- Dieter _______________________________________________ For more information about ZODB, see the ZODB Wiki: http://www.zope.org/Wikis/ZODB/ ZODB-Dev mailing list - ZODB-Dev@zope.org http://mail.zope.org/mailman/listinfo/zodb-dev
