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https://issues.apache.org/jira/browse/SOLR-5285?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13782943#comment-13782943
]
Varun Thacker commented on SOLR-5285:
-------------------------------------
I don't think I have been to able to explain the problem accurately in the Jira
description. Let me try again..
1. Index docs with childDocs. So let's take the example on
https://cwiki.apache.org/confluence/display/solr/Other+Parsers#OtherParsers-BlockJoinQueryParsers
2. Now I query
http://localhost:8983/solr/collection1/select?q=*:*&fq=content_type:%22parentDocument%22
3. This is the response
{code}<response>
<lst name="responseHeader">
<int name="status">0</int>
<int name="QTime">2</int>
<lst name="params">
<str name="q">*:*</str>
<str name="fq">content_type:"parentDocument"</str>
</lst>
</lst>
<result name="response" numFound="2" start="0">
<doc>
<str name="id">1</str>
<arr name="title">
<str>Solr adds block join support</str>
</arr>
<arr name="content_type">
<str>parentDocument</str>
</arr>
<long name="_version_">1447311301175934976</long>
</doc>
<doc>
<str name="id">3</str>
<arr name="title">
<str>Lucene and Solr 4.5 is out</str>
</arr>
<arr name="content_type">
<str>parentDocument</str>
</arr>
<long name="_version_">1447311327665061888</long>
</doc>
</result>
</response>
{code}
4. Ideally I would want this as my response:
{code}
<response>
<lst name="responseHeader">
<int name="status">0</int>
<int name="QTime">2</int>
<lst name="params">
<str name="q">*:*</str>
</lst>
</lst>
<result name="response" numFound="4" start="0">
<doc>
<str name="id">1</str>
<arr name="title">
<str>Solr adds block join support</str>
</arr>
<arr name="content_type">
<str>parentDocument</str>
</arr>
<long name="_version_">1447311301175934976</long>
<doc>
<str name="id">2</str>
<str name="comments">SolrCloud supports it too!</str>
</doc>
</doc>
<doc>
<str name="id">3</str>
<arr name="title">
<str>Lucene and Solr 4.5 is out</str>
</arr>
<arr name="content_type">
<str>parentDocument</str>
</arr>
<long name="_version_">1447311327665061888</long>
<doc>
<str name="id">4</str>
<str name="comments">Lots of new features</str>
</doc>
</doc>
</result>
</response>
{code}
Also [~mkhludnev] ,
bq. approach no 1. seems never fitting, because the relation is already present
in the index
how is the relation already present in the index? From what I understand each
child doc has a _root_ field which points to the parent doc. But we do not have
the opposite relation. To implement this feature we would need the relation b/w
each parent and all it's child doc right? Am I missing anything?
> 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.
> [~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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