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https://issues.apache.org/jira/browse/SOLR-16172?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17529874#comment-17529874
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Jan Høydahl commented on SOLR-16172:
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I added a [GitHub Pull Request #827|https://github.com/apache/solr/pull/827]
that reproduces the same exception in main branch as a unit test, for easier
inspection by committers.
> Error when combining Grouping with Childfield sorting with more than one
> Shard
> -------------------------------------------------------------------------------
>
> Key: SOLR-16172
> URL: https://issues.apache.org/jira/browse/SOLR-16172
> Project: Solr
> Issue Type: Bug
> Security Level: Public(Default Security Level. Issues are Public)
> Components: SolrCloud, SolrJ
> Affects Versions: 8.4.1, 8.10.1, 8.11.1
> Reporter: Øystein Johnsen Veinan
> Priority: Major
> Attachments: SolrGroupError.zip, readme.txt
>
> Time Spent: 10m
> Remaining Estimate: 0h
>
> When combining Grouping with Childfield sorting with more than one Shard the
> following error occures:
> *"Error from server at null: class java.lang.String cannot be cast to class
> org.apache.lucene.util.BytesRef (java.lang.String is in module java.base of
> loader 'bootstrap'; org.apache.lucene.util.BytesRef is in unnamed module of
> loader org.eclipse.jetty.webapp.WebAppClassLoader @180e6ac4)"*
> To reproduce use the attached docker containers.
> Check out the file Readme.txt
> We believe that the error will occur in more than the affected versions. The
> attached docker-compose file contain the version 8.11.1.
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