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https://issues.apache.org/jira/browse/SOLR-9448?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15776149#comment-15776149
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ASF subversion and git services commented on SOLR-9448:
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Commit 6cf1f0f51f5f11750b4d9d9ebe157453550b76eb in lucene-solr's branch
refs/heads/branch_6x from [~mkhludnev]
[ https://git-wip-us.apache.org/repos/asf?p=lucene-solr.git;h=6cf1f0f ]
SOLR-9448: providing a test for workaround of a differently named uniqueKey
field
> [subquery] calls another collection fails with "undefined field" or NPE from
> mergeIds
> -------------------------------------------------------------------------------------
>
> 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, SOLR-9448.patch, SOLR-9448.patch,
> 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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