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Date: Thu, 9 Feb 2012 23:10:58 +0000 (UTC)
From: "Michael McCandless (Commented) (JIRA)" <jira@apache.org>
To: dev@lucene.apache.org
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Subject: [jira] [Commented] (SOLR-3076) Solr should support block joins
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    [ https://issues.apache.org/jira/browse/SOLR-3076?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13205016#comment-13205016 ] 

Michael McCandless commented on SOLR-3076:
------------------------------------------

Mikhail, I think something like that looks right?  It expresses the join structure to the QP.

Hoss, you're right, you can have the same field name on parent/child/grandchild/etc., so I agree, we will need something in the query syntax to disambiguate which is which for such cases.  Though I would think this would be the exception not the rule (ie, I'd expect apps to name the fields "uniquely" across parent and child docs).

Maybe there can be field aliases?  Eg, book_page_count:[0 to 1000] and chapter_page_count[10:40], and the QP is told to map book_page_count -> parent:size and chapter_page_count -> child:size?  Or maybe we let the user explicitly scope the field, eg chapter:size, book:size, book:title, etc.  Not sure...
                
> Solr should support block joins
> -------------------------------
>
>                 Key: SOLR-3076
>                 URL: https://issues.apache.org/jira/browse/SOLR-3076
>             Project: Solr
>          Issue Type: New Feature
>            Reporter: Grant Ingersoll
>         Attachments: SOLR-3076.patch, bjq-vs-filters-backward-disi.patch, bjq-vs-filters-illegal-state.patch, parent-bjq-qparser.patch, parent-bjq-qparser.patch, solrconf-bjq-erschema-snippet.xml
>
>
> Lucene has the ability to do block joins, we should add it to Solr.

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