[jira] [Commented] (SOLR-5285) Solr response format should support child Docs

["Varun Thacker (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/SOLR-5285?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13996169#comment-13996169 ] 

Varun Thacker commented on SOLR-5285:
-------------------------------------

I think we should fix the back compat tests before resolving this.

> 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: 4.9, 5.0
>
>         Attachments: SOLR-5285.patch, SOLR-5285.patch, SOLR-5285.patch, SOLR-5285.patch, SOLR-5285.patch, 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_lucene@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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