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https://issues.apache.org/jira/browse/SOLR-9448?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15467176#comment-15467176
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Mikhail Khludnev commented on SOLR-9448:
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There reason is that we set caller collection uniqKey even it's different in
another (calee) collection.
https://github.com/apache/lucene-solr/blob/master/solr/core/src/java/org/apache/solr/handler/component/QueryComponent.java#L914
> [subquery] calls another collection fails with "undefined field"
> -----------------------------------------------------------------
>
> Key: SOLR-9448
> URL: https://issues.apache.org/jira/browse/SOLR-9448
> Project: Solr
> Issue Type: Bug
> Security Level: Public(Default Security Level. Issues are Public)
> Components: SolrCloud
> Affects Versions: 6.1, 6.2
> Reporter: Mikhail Khludnev
> Assignee: Mikhail Khludnev
> Attachments: SOLR-9448.patch
>
>
> h2.UPD
> The sentences below seems not really actual. The more objective synopsis is
> described in the first comment. It seems like
> fl=foo:\[subquery]&collection=bar can be fixed just by declaring fields in
> schema.
> h3. Old description
> straightforward \[subquery] implementation executes requests on a caller
> collection, but just hitting another one with
> {{caller/select?q=..&collection=callee}}. The problem is that for
> {{GET_FIELDS}} it uses uniqKey from a caller collection but not a callee one.
> Another observation, at that case both single sharded collections are
> collocated at the same instance. Then, subquery can't be parsed if it queries
> a field which are absent in caller schema. All of this seems pretty strange
> like hitting an edge case.
> h2. workaround
> Perhaps you can collocate secondary index and call it {{fromIndex=callee}}.
> Or you can name uniqKey the same, keeping the different app semantic.
>
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