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https://issues.apache.org/jira/browse/SOLR-13892?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16967945#comment-16967945
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Joel Bernstein commented on SOLR-13892:
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The ..join.TermsQuery also extends MultiTermQuery which seems to just create a
big disjunction query. This will bog down fairly quickly as the number of terms
increases.
The join is this patch was tested with 400,000 join terms between indexes and
provided sub-second response times. A 400,000 MultiTermQuery is not going to
perform well and is going to take a lot of time and memory to construct.
> Add postfilter support to {!join} queries
> -----------------------------------------
>
> Key: SOLR-13892
> URL: https://issues.apache.org/jira/browse/SOLR-13892
> Project: Solr
> Issue Type: Improvement
> Security Level: Public(Default Security Level. Issues are Public)
> Components: query parsers
> Affects Versions: master (9.0)
> Reporter: Jason Gerlowski
> Priority: Major
> Attachments: SOLR-13892.patch
>
>
> The JoinQParserPlugin would be a lot performant in many use-cases if it could
> operate as a post-filter, especially when doc-values for the involved fields
> are available.
> With this issue, I'd like to propose a post-filter implementation for the
> {{join}} qparser.
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