Shai Erera created LUCENE-4767:
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Summary: Add FacetRequest.ResultMode.AUTO_EXPAND
Key: LUCENE-4767
URL: https://issues.apache.org/jira/browse/LUCENE-4767
Project: Lucene - Core
Issue Type: New Feature
Components: modules/facet
Reporter: Shai Erera
A ResultMode.AUTO_EXPAND will auto-expand a node in tree if only one result
came up. For example, if you have a Date facet, and you ask to count the top-K
of Date/, then if your documents were all created in say 2010, you'll get a
redundant facet back: Date/2010 (no other children of Date/).
Rather, since we already have all the categories counted at hand, we can
"auto-expand" Date/2010 recursively, until we get to a level in the tree which
has more than one children. And of course, if all the results belong to a
single leaf node, then we should return it ...
This can be implemented by adding a new ResultMode and a special
FacetResultsHandler, which performs the auto-expansion. I think it should be
limited to depth=1 only at the moment ...
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