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https://issues.apache.org/jira/browse/SOLR-3076?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13713486#comment-13713486
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Mikhail Khludnev commented on SOLR-3076:
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[[email protected]] I thought address this question at SOLR-4836, but it would
be great if you cover it altogether.
Pls confirm my understanding, if <uniqKey> is specified, for every block
children obtain value for \_root\_ field, from parent's <uniqKey> field. Hence
\_root\_ field is always used for IW.updateDocs call.
btw, uber compact codec can be implemented for that \_root\_ field that somehow
interfere with Vadim's idea.
[~vkirilchuk] introducing this separate case, blows IndexWriter code.
Presumably you can try to introduce a facility to update not by term as now,
but for some kind of generic query. fwiw, parent bitset is not really exists in
IndexWriter
> Solr(Cloud) 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
> Assignee: Yonik Seeley
> Fix For: 5.0, 4.4
>
> Attachments: 27M-singlesegment-histogram.png, 27M-singlesegment.png,
> bjq-vs-filters-backward-disi.patch, bjq-vs-filters-illegal-state.patch,
> child-bjqparser.patch, dih-3076.patch, dih-config.xml,
> parent-bjq-qparser.patch, parent-bjq-qparser.patch, Screen Shot 2012-07-17 at
> 1.12.11 AM.png, SOLR-3076-childDocs.patch, SOLR-3076.patch, SOLR-3076.patch,
> SOLR-3076.patch, SOLR-3076.patch, SOLR-3076.patch, SOLR-3076.patch,
> SOLR-3076.patch, SOLR-3076.patch, SOLR-3076.patch, SOLR-3076.patch,
> SOLR-7036-childDocs-solr-fork-trunk-patched,
> 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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