[SOLR-5285] Solr response format should support child Docs

• Type: New Feature
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 4.9, 6.0
• Assignee: Chris M. Hostetter
• Reporter: Varun Thacker
• Created: 28/Sep/13 04:19
• Updated: 21/Nov/19 00:42
• Resolved: 07/Jun/14 01:46

Description

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.

[e-mail] 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.

Issue Links

• is blocked by: SOLR-6048 Fix asserts for SolrDocument, SolrInputDocument and SolrInputField in SolrTestCaseJ4