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https://issues.apache.org/jira/browse/SOLR-9583?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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David Smiley resolved SOLR-9583.
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Resolution: Won't Fix
> When the same <uniqueKey> exists across multiple collections that are
> searched with an alias, the document returned in the results list is
> indeterminate
> --------------------------------------------------------------------------------------------------------------------------------------------------------
>
> Key: SOLR-9583
> URL: https://issues.apache.org/jira/browse/SOLR-9583
> Project: Solr
> Issue Type: Wish
> Reporter: Erick Erickson
> Priority: Major
>
> Not quite sure whether to call this a bug or improvement...
> Currently if I have two collections C1 and C2 and an alias that points to
> both _and_ I have a document in both collections with the _same_ <unkqueKey>,
> the returned list sometimes has the doc from C1 and sometimes from C2.
> If I add shards.info=true I see the document found in each collection, but
> only one in the document list. Which one changes if I re-submit the identical
> query.
> This seems incorrect, perhaps a side effect of piggy-backing the collection
> aliasing on searching multiple shards? (Thanks Shalin for that bit of
> background).
> I can see both use-cases:
> 1> aliasing multiple collections validly assumes that <uniqueKey>s should be
> unique across them all and only one doc should be returned. Even in this case
> which doc should be returned should be deterministic.
> 2> these are arbitrary collections without any a-priori relationship and
> identical <unkqueKey>s do NOT identify the "same" document so both should be
> returned.
> So I propose we do two things:
> a> provide a param for the CREATEALIAS command that controls whether docs
> with the same <unkqueKey> from different collections should both be returned.
> If they both should, there's still the question of in what order.
> b> provide a deterministic way dups from different collections are resolved.
> What that algorithm is I'm not quite sure. The order the collections were
> specified in the CREATEALIAS command? Some field in the documents? Other???
> What happens if this option is not specified on the CREATEALIAS command?
> Implicit in the above is my assumption that it's perfectly valid to have
> different aliases in the same cluster behave differently if specified.
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