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https://issues.apache.org/jira/browse/SOLR-2272?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12999068#comment-12999068
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Yonik Seeley commented on SOLR-2272:
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bq. I am interested in joining on fields of a different schema (multiple core
join).
No, it's not currently possible, but it's an interesting idea, and seems doable
provided the cores are in the same solr JVM.
The workaround today would be to just add both document types to the same core
(merge the schemas so one schema can support both document types).
> Join
> ----
>
> Key: SOLR-2272
> URL: https://issues.apache.org/jira/browse/SOLR-2272
> Project: Solr
> Issue Type: New Feature
> Components: search
> Reporter: Yonik Seeley
> Fix For: 4.0
>
> Attachments: SOLR-2272.patch, SOLR-2272.patch
>
>
> Limited join functionality for Solr, mapping one set of IDs matching a query
> to another set of IDs, based on the indexed tokens of the fields.
> Example:
> fq={!join from=parent_ptr to:parent_id}child_doc:query
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