[jira] [Created] (LUCENE-4767) Add FacetRequest.ResultMode.AUTO_EXPAND

["Shai Erera (JIRA)" <ji...@apache.org>]

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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