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https://issues.apache.org/jira/browse/SOLR-16758?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17714749#comment-17714749
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Michael Gibney commented on SOLR-16758:
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Thanks for reporting! Can you share some specific example queries (including as
much context, configs, etc. as seems appropriate) to illustrate the problem?
> GraphQuery Performing Slower in Solr 9
> --------------------------------------
>
> Key: SOLR-16758
> URL: https://issues.apache.org/jira/browse/SOLR-16758
> Project: Solr
> Issue Type: Bug
> Security Level: Public(Default Security Level. Issues are Public)
> Reporter: Kira Traynor
> Priority: Major
>
> We found that the changes made in SOLR-14185 with the GraphQuery slowed down
> the performance of the graph join by around 50%. Reverting the changes made
> in that pr to use a `Filter` object to get the `DocIdSet` rather than using a
> `DocIdSetIterator`, sped the query times up in our tests to be more similar
> to what we were seeing with the Solr 8 graph joins.
> The same change was made to the JoinQuery class so possibly slower
> performance can be found there as well.
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