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https://issues.apache.org/jira/browse/SOLR-5285?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Varun Thacker updated SOLR-5285:
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    Attachment: SOLR-5285.patch

Syntax: [children parentFilter="content_type:parentDocument"]

This patch adds support for nested docs for wt=xml. I will add for other 
writers soon.

There is no way to specify return fields for a childDoc. Should there be an 
option?

I added ChildDocTransformerFactory#toSolrDocument which is the same as 
TextResponseWriter#toSolrDocument. It's not the best thing to do.

[~mkhludnev] thanks for your suggestion :)

> Solr response format should support child Docs
> ----------------------------------------------
>
>                 Key: SOLR-5285
>                 URL: https://issues.apache.org/jira/browse/SOLR-5285
>             Project: Solr
>          Issue Type: New Feature
>            Reporter: Varun Thacker
>             Fix For: 5.0, 4.6
>
>         Attachments: SOLR-5285.patch
>
>
> Solr has added support for taking childDocs as input ( only XML till now ). 
> It's currently used for BlockJoinQuery. 
> I feel that if a user indexes a document with child docs, even if he isn't 
> using the BJQ features and is just searching which results in a hit on the 
> parentDoc, it's childDocs should be returned in the response format.
> [~hossman_luc...@fucit.org] on IRC suggested that the DocTransformers would 
> be the place to add childDocs to the response.
> Now given a docId one needs to find out all the childDoc id's. A couple of 
> approaches which I could think of are 
> 1. Maintain the relation between a parentDoc and it's childDocs during 
> indexing time in maybe a separate index?
> 2. Somehow emulate what happens in ToParentBlockJoinQuery.nextDoc() - Given a 
> parentDoc it finds out all the childDocs but this requires a childScorer.
> Am I missing something obvious on how to find the relation between a 
> parentDoc and it's childDocs because none of the above solutions for this 
> look right.



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