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From "Shai Erera (JIRA)" <j...@apache.org>
Subject [jira] [Created] (LUCENE-4750) Convert DrillDown to DrillDownQuery
Date Mon, 04 Feb 2013 14:50:24 GMT
Shai Erera created LUCENE-4750:
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             Summary: Convert DrillDown to DrillDownQuery
                 Key: LUCENE-4750
                 URL: https://issues.apache.org/jira/browse/LUCENE-4750
             Project: Lucene - Core
          Issue Type: Improvement
          Components: modules/facet
            Reporter: Shai Erera


DrillDown is a utility class for creating drill-down queries over a base query and a bunch
of categories. We've been asked to support AND, OR and AND of ORs. The latter is not so simple
as a static utility method though, so instead we have some sample code ...

Rather, I think that we can just create a DrillDownQuery (extends Query) which takes a baseQuery
in its ctor and exposes add(CategoryPath...), such that every such group of categories is
AND'ed with other groups, and internally they are OR'ed. It's very similar to how you would
construct a BooleanQuery, only simpler and specific to facets.

Internally, it would build a BooleanQuery and delegate rewrite, createWeight etc to it.

That will remove the need for the static utility methods .. or we can keep static term() for
convenience.

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