[ https://issues.apache.org/jira/browse/LUCENE-4610?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Shai Erera resolved LUCENE-4610. -------------------------------- Resolution: Implemented Lucene Fields: New,Patch Available (was: New) We have OrdinalPolicy.NO_PARENTS with a warning not to use it when a document will share few categories with common ancestors. I don't think that at this point we should do anything more. > Implement a NoParentsAccumulator > -------------------------------- > > Key: LUCENE-4610 > URL: https://issues.apache.org/jira/browse/LUCENE-4610 > Project: Lucene - Core > Issue Type: New Feature > Components: modules/facet > Reporter: Shai Erera > Attachments: LUCENE-4610.patch > > > Mike experimented with encoding just the exact categories ordinals on > LUCENE-4602, and I added OrdinalPolicy.NO_PARENTS, with a comment saying that > this requires a special FacetsAccumulator. > The idea is to write the exact categories only for each document, and then at > search time count up the parents chain to compute requested facets (I say > count, but it can be any weight). > One limitation of such accumulator is that it cannot be used when e.g. a > document is associated with two categories who share the same parent, because > that may result in incorrect weights computed (e.g. a document might have > several Authors, and so counting the Author facet may yield wrong counts). So > it can be used only when the app knows it doesn't add such facets, or that it > always asks to aggregate a 'root' that in its path this criteria doesn't hold > (no categories share the same parent). -- This message is automatically generated by JIRA. If you think it was sent incorrectly, please contact your JIRA administrators For more information on JIRA, see: http://www.atlassian.com/software/jira --------------------------------------------------------------------- To unsubscribe, e-mail: dev-unsubscr...@lucene.apache.org For additional commands, e-mail: dev-h...@lucene.apache.org