Shai Erera created LUCENE-4586:
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Summary: 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
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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