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https://issues.apache.org/jira/browse/LUCENE-3133?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13038328#comment-13038328
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Mike Sokolov commented on LUCENE-3133:
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Mightn't you want to be able to do self-joins? For example if you want to
represent an XML document, and your field is "Element" - it has any number
Attribute children and any number of Node children, which in turn may be
Elements. I wonder if LUCENE-2454 could be extended to allow recursive
ChildDocumentQuery - ie DescendantDocumentQuery?
> Fix QueryParser to handle nested fields
> ---------------------------------------
>
> Key: LUCENE-3133
> URL: https://issues.apache.org/jira/browse/LUCENE-3133
> Project: Lucene - Java
> Issue Type: Improvement
> Reporter: Michael McCandless
> Fix For: 3.2, 4.0
>
>
> Once we commit LUCENE-2454, we need to make it easy for apps to enable this
> with QueryParser.
> It seems like it's a "schema" like behavior, ie we need to be able to express
> the join structure of the related fields.
> And then whenever QP produces a query that spans fields requiring a join, the
> NestedDocumentQuery is used to wrap the child fields?
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