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https://issues.apache.org/jira/browse/SOLR-5285?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13780919#comment-13780919
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Mikhail Khludnev commented on SOLR-5285:
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giving you search with !\{parent qparser, which children you want to return,
all children belong to a parent or only those which passed by the child level
query?
note: approach no 1. seems never fitting, because the relation is already
present in the index; approach no.2 seems like over-optimization, if we are
talking about enriching only 'rows' parent.
> 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
>
>
> 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.
> [[email protected]] 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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