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https://issues.apache.org/jira/browse/SOLR-3076?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13447419#comment-13447419
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Mikhail Khludnev commented on SOLR-3076:
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Hi
I can't check it right now, can't remember how deep I covered it, but I
remember that there was a test or even level of certainty that nested docs are
passed through DisttributedUpdateProcessor by using a top level doc primary
key. Therefore whole block should land into particular shard. If this
necessary condition is met query side should work out of the box.
Also you can find about performance benefits
blog.griddynamics.com/2012/08/block-join-query-performs.htmli
> 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: 27M-singlesegment-histogram.png, 27M-singlesegment.png,
> bjq-vs-filters-backward-disi.patch, bjq-vs-filters-illegal-state.patch,
> child-bjqparser.patch, parent-bjq-qparser.patch, parent-bjq-qparser.patch,
> Screen Shot 2012-07-17 at 1.12.11 AM.png, SOLR-3076.patch, SOLR-3076.patch,
> SOLR-3076.patch, SOLR-3076.patch, SOLR-3076.patch, SOLR-3076.patch,
> solrconf-bjq-erschema-snippet.xml, solrconfig.xml.patch,
> tochild-bjq-filtered-search-fix.patch
>
>
> Lucene has the ability to do block joins, we should add it to Solr.
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