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https://issues.apache.org/jira/browse/LUCENE-3997?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13258822#comment-13258822
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Martijn van Groningen commented on LUCENE-3997:
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The reason that joining and grouping are different modules is that these are
different functionalities. However these functionalities do overlap a bit with
each other. Both joining and grouping can be used for a parent child like
search. I'm not sure what would be a good option. Joining does use grouping's
TopGroups and GroupDocs... If we are going to have a combined module maybe we
should name it relational module or parent child module?
> join module should not depend on grouping module
> ------------------------------------------------
>
> Key: LUCENE-3997
> URL: https://issues.apache.org/jira/browse/LUCENE-3997
> Project: Lucene - Java
> Issue Type: Task
> Affects Versions: 4.0
> Reporter: Robert Muir
> Fix For: 4.0
>
> Attachments: LUCENE-3997.patch, LUCENE-3997.patch
>
>
> I think TopGroups/GroupDocs should simply be in core?
> Both grouping and join modules use these trivial classes, but join depends on
> grouping just for them.
> I think its better that we try to minimize these inter-module dependencies.
> Of course, another option is to combine grouping and join into one module, but
> last time i brought that up nobody could agree on a name.
> Anyway I think the change is pretty clean: its similar to having basic stuff
> like Analyzer.java in core,
> so other things can work with Analyzer without depending on any specific
> implementing modules.
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