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https://issues.apache.org/jira/browse/SOLR-12298?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16470720#comment-16470720
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Gus Heck commented on SOLR-12298:
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An additional thing to consider... besides block/join there's graph query,
which potentially fetches a hierarchy of arbitrary depth (and additional
complexity too). It might be interesting to think about doing something that's
general here with the ability to express nesting and also cycles (for an
example of a nice solution to cycles in JSON see [https://github.com/jsog/jsog]
if you're not already familiar with it).
> Index Full nested document Hierarchy For Queries (umbrella issue)
> -----------------------------------------------------------------
>
> Key: SOLR-12298
> URL: https://issues.apache.org/jira/browse/SOLR-12298
> Project: Solr
> Issue Type: Improvement
> Security Level: Public(Default Security Level. Issues are Public)
> Reporter: mosh
> Priority: Major
>
> Solr ought to have the ability to index deeply nested objects, while storing
> the original document hierarchy.
> Currently the client has to index the child document's full path and level
> to manually reconstruct the original document structure, since the children
> are flattened and returned in the reserved "__childDocuments__" key.
> Ideally you could index a nested document, having Solr transparently add the
> required fields while providing a document transformer to rebuild the
> original document's hierarchy.
>
> This issue is an umbrella issue for the particular tasks that will make it
> all happen – either subtasks or issue linking.
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