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https://issues.apache.org/jira/browse/LUCENE-4586?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13509847#comment-13509847
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Gilad Barkai commented on LUCENE-4586:
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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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