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https://issues.apache.org/jira/browse/SOLR-16717?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17704711#comment-17704711
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Gus Heck commented on SOLR-16717:
---------------------------------
Joins are a special case of graph. Distributed graph query has been explored
here: https://issues.apache.org/jira/browse/SOLR-11384 you may wish to peek at
that.
> Join collocated shards
> ----------------------
>
> Key: SOLR-16717
> URL: https://issues.apache.org/jira/browse/SOLR-16717
> Project: Solr
> Issue Type: Improvement
> Security Level: Public(Default Security Level. Issues are Public)
> Reporter: Mikhail Khludnev
> Priority: Major
>
> h3. Context
> It's about \{!join} query parser and distributed mode.
> h3. As is
> SOLR-4905 allows to join from single shard collection to many shards
> collection.
> h3. Challenge
> * Support multiple shards on from side as well,
> * but strictly stick to collocated indices that promise much performance.
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