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Posted to dev@lucene.apache.org by "Gilad Barkai (JIRA)" <ji...@apache.org> on 2013/02/03 15:26:13 UTC
[jira] [Commented] (LUCENE-4748) Add DrillSideways helper class to
Lucene facets module
[ https://issues.apache.org/jira/browse/LUCENE-4748?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13569780#comment-13569780 ]
Gilad Barkai commented on LUCENE-4748:
--------------------------------------
Great idea!
Since drill-down followed by drill-sideways is a sort of (re)filtering over the original result set, perhaps the query result (say ScoredDocIds) could be passed through rather than re-evaluating the Query?
IIRC the scores should not change during drill-down (and sideways as well), so without re-evaluating this could perhaps save some juice?
> Add DrillSideways helper class to Lucene facets module
> ------------------------------------------------------
>
> Key: LUCENE-4748
> URL: https://issues.apache.org/jira/browse/LUCENE-4748
> Project: Lucene - Core
> Issue Type: Improvement
> Reporter: Michael McCandless
> Assignee: Michael McCandless
> Fix For: 4.2, 5.0
>
> Attachments: LUCENE-4748.patch, LUCENE-4748.patch
>
>
> This came out of a discussion on the java-user list with subject
> "Faceted search in OR": http://markmail.org/thread/jmnq6z2x7ayzci5k
> The basic idea is to count "near misses" during collection, ie
> documents that matched the main query and also all except one of the
> drill down filters.
> Drill sideways makes for a very nice faceted search UI because you
> don't "lose" the facet counts after drilling in. Eg maybe you do a
> search for "cameras", and you see facets for the manufacturer, so you
> drill into "Nikon".
> With drill sideways, even after drilling down, you'll still get the
> counts for all the other brands, where each count tells you how many
> hits you'd get if you changed to a different manufacturer.
> This becomes more fun if you add further drill-downs, eg maybe I next drill
> down into Resolution=10 megapixels", and then I can see how many 10
> megapixel cameras all other manufacturers, and what other resolutions
> Nikon cameras offer.
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