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https://issues.apache.org/jira/browse/LUCENE-3482?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Martijn van Groningen updated LUCENE-3482:
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Attachment: LUCENE-3482.patch
Attached initial patch. The patch has a concept named GroupHolder that knowns
how to efficiently collect groups. All grouping collectors use that concept to
prevent subclassing.
I didn't change the already existing collectors in the grouping module. I added
a package research inside the grouping package. I decided to keep the original
collectors around to test performance between the original collectors and
collectors that use the GroupHolder.
The grouping module depends now on the queries module. I added a method to
DocValues to retrieve the ord from a value:
{code}public int ord(MutableValue value) { throw new
UnsupportedOperationException(); }{code}
> Refactor grouping module to be more maintainable
> ------------------------------------------------
>
> Key: LUCENE-3482
> URL: https://issues.apache.org/jira/browse/LUCENE-3482
> Project: Lucene - Java
> Issue Type: Improvement
> Components: modules/grouping
> Affects Versions: 4.0
> Reporter: Martijn van Groningen
> Fix For: 4.0
>
> Attachments: LUCENE-3482.patch
>
>
> 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
> DocValues.ValueFiller.
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