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From "Martijn van Groningen (Created) (JIRA)" <>
Subject [jira] [Created] (LUCENE-3482) Refactor grouping module to be more maintainable
Date Sun, 02 Oct 2011 19:55:33 GMT
Refactor grouping module to be more maintainable

                 Key: LUCENE-3482
             Project: Lucene - Java
          Issue Type: Improvement
          Components: modules/grouping
    Affects Versions: 4.0
            Reporter: Martijn van Groningen
             Fix For: 4.0

Currently we have 4 types of grouping collectors and 8 concrete subclasses in Lucene / Solr.
In current architecture for each type of collector two concrete subclasses need to be created.
An implementation optimized for single term based groups and a more general implementation
that works with MutableValue to also support grouping by functions. If we want for example
group by IndexDocValues each type of grouping collector needs to have three concrete subclasses.
This design isn't very maintainable.

I think it is best to introduce a concept that knows how deals with dealing groups for all
the different sources. Therefore the grouping module should depend on the queries module,
so that grouping can reuse the ValueSource concept. A term based concrete impl. of this concept
knows for example to use the DocValues.ord() method. Or more generic concrete impl. will use

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