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https://issues.apache.org/jira/browse/SOLR-16717?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17704751#comment-17704751
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Mikhail Khludnev commented on SOLR-16717:
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Thanks, [~gus] . I definitely want to focus just on plain joins. Btw, there's a
thread sometime ago regarding cross collection join which you could probably
missed [Trying to understand cross-collection-join routing/hashing choices and
behavior|https://www.mail-archive.com/[email protected]/msg02372.html]. Could
you please elaborate? I'm sure it would be great for community.
> 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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