[jira] [Created] (LUCENE-4964) Allow custom drill-down sub-queries

["Michael McCandless (JIRA)" <ji...@apache.org>]

Michael McCandless created LUCENE-4964:
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             Summary: Allow custom drill-down sub-queries
                 Key: LUCENE-4964
                 URL: https://issues.apache.org/jira/browse/LUCENE-4964
             Project: Lucene - Core
          Issue Type: Improvement
          Components: modules/facet
            Reporter: Michael McCandless
            Assignee: Michael McCandless
             Fix For: 5.0, 4.4


Today the facet module indexes a term for each facet added to a
document, and DrillDown/SidewaysQuery assume this by creating a
TermQuery, or OR of TermQuery, for each dimension the app drills down
on.

I think we should relax this and allow an [expert] arbitrary query to
drill down on a given dimension ... e.g., this can enable future
dynamic faceting methods, or custom app drill-down methods.

It's easy for DrillDownQuery to do this, but requires generalization
in DrillSideways, basically just reviving the first approach on
LUCENE-4748.  This approach is somewhat slower, but more general
... it will keep using the current method as an optimization when it
applies.

This should also fix the possible performance regression from
LUCENE-4952 when scoreSubDocsAtOnce is true, by using the
MinShouldMatchSumScorer in that case.


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