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https://issues.apache.org/jira/browse/SOLR-12519?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16595001#comment-16595001
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David Smiley commented on SOLR-12519:
-------------------------------------

The PR looks good; I'm glad we can support adding nested child docs even on a 
search result document that is not itself the root doc (and is tested).  I'll 
do some precommit & tests and commit later today.  I think we'll both be 
relieved that this issue is going to be done soon :-)

> Support Deeply Nested Docs In Child Documents Transformer
> ---------------------------------------------------------
>
>                 Key: SOLR-12519
>                 URL: https://issues.apache.org/jira/browse/SOLR-12519
>             Project: Solr
>          Issue Type: Sub-task
>      Security Level: Public(Default Security Level. Issues are Public) 
>            Reporter: mosh
>            Priority: Major
>         Attachments: SOLR-12519-fix-solrj-tests.patch, 
> SOLR-12519-no-commit.patch, SOLR-12519.patch
>
>          Time Spent: 24h 40m
>  Remaining Estimate: 0h
>
> As discussed in SOLR-12298, to make use of the meta-data fields in 
> SOLR-12441, there needs to be a smarter child document transformer, which 
> provides the ability to rebuild the original nested documents' structure.
>  In addition, I also propose the transformer will also have the ability to 
> bring only some of the original hierarchy, to prevent unnecessary block join 
> queries. e.g.
> {code}  {"a": "b", "c": [ {"e": "f"}, {"e": "g"} , {"h": "i"} ]} {code}
>  Incase my query is for all the children of "a:b", which contain the key "e" 
> in them, the query will be broken in to two parts:
>  1. The parent query "a:b"
>  2. The child query "e:*".
> If the only children flag is on, the transformer will return the following 
> documents:
>  {code}[ {"e": "f"}, {"e": "g"} ]{code}
> In case the flag was not turned on(perhaps the default state), the whole 
> document hierarchy will be returned, containing only the matching children:
> {code}{"a": "b", "c": [ {"e": "f"}, {"e": "g"} ]{code}



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