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https://issues.apache.org/jira/browse/SOLR-14728?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17249668#comment-17249668
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Jason Gerlowski commented on SOLR-14728:
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Hey [~jbernste] I'm going to close this out as a duplicate of SOLR-15049. I
wouldn't've created that ticket if I'd realized this one existed, but the newer
ticket already has an associated PR, so this should be the one we close.
> Add self join optimization to the TopLevelJoinQuery
> ---------------------------------------------------
>
> Key: SOLR-14728
> URL: https://issues.apache.org/jira/browse/SOLR-14728
> Project: Solr
> Issue Type: New Feature
> Reporter: Joel Bernstein
> Priority: Major
>
> A simple optimization can be put in place to massively improve join
> performance when the TopLevelJoinQuery is performing a self join (same core)
> and the *to* and *from* fields are the same field. In this scenario the top
> level doc values ordinals can be used directly as a filter avoiding the most
> expensive part of the join which is the bytes ref reconciliation between the
> *to* and *from* fields.
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