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Posted to dev@lucene.apache.org by "Gilad Barkai (JIRA)" <ji...@apache.org> on 2012/12/04 17:45:58 UTC
[jira] [Commented] (LUCENE-4586) Change default ResultMode of
FacetRequest to PER_NODE_IN_TREE
[ https://issues.apache.org/jira/browse/LUCENE-4586?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13509847#comment-13509847 ]
Gilad Barkai commented on LUCENE-4586:
--------------------------------------
Patch looks good, ready for a commit.
+1
> Change default ResultMode of FacetRequest to PER_NODE_IN_TREE
> -------------------------------------------------------------
>
> Key: LUCENE-4586
> URL: https://issues.apache.org/jira/browse/LUCENE-4586
> Project: Lucene - Core
> Issue Type: Improvement
> Components: modules/facet
> Reporter: Shai Erera
> Assignee: Shai Erera
> Priority: Minor
> Fix For: 4.1, 5.0
>
> Attachments: LUCENE-4586.patch, LUCENE-4586.patch
>
>
> Today the default ResultMode is GLOBAL_FLAT, but it should be PER_NODE_IN_TREE. ResultMode is being used whenever you set the depth of FacetRequest to greater than 1. The difference between the two is:
> * PER_NODE_IN_TREE would then compute the top-K categories recursively, for every top category at every level (up to depth). The results are returned in a tree structure as well. For instance:
> {noformat}
> Date
> 2010
> March
> February
> 2011
> April
> May
> {noformat}
> * GLOBAL_FLAT computes the top categories among all the nodes up to depth, and returns a flat list of categories.
> GLOBAL_FLAT is faster to compute than PER_NODE_IN_TREE (it just computes top-K among N total categories), however I think that it's less intuitive, and therefore should not be used as a default. In fact, I think this is kind of an expert usage.
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