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https://issues.apache.org/jira/browse/SOLR-16172?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17530232#comment-17530232
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Michael Gibney commented on SOLR-16172:
---------------------------------------
Confirmed, this issue is indeed a special case of SOLR-12457. [~janhoy] I took
the liberty of integrating your test from
[apache/solr#827|https://github.com/apache/solr/pull/827], and with some minor
adjustments it works nicely.
The core of the issue is that function ValueSource where the value is derived
from a field do not carry a reference to the underlying SchemaField, so
sortField marshalling doesn't work properly. The outstanding PR (originally
against lucene/solr, today migrated to TLP solr) fixes this cleanly, I think,
by allowing to bundle a reference to the schemaField along with the (wrapped)
ValueSource.
> 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: 20m
> 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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