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https://issues.apache.org/jira/browse/SOLR-7798?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16373938#comment-16373938
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Michael Gibney commented on SOLR-7798:
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It looks like the randomness comes from [Line 58 or
TestExpandComponent|https://github.com/apache/lucene-solr/blob/master/solr/core/src/test/org/apache/solr/handler/component/TestExpandComponent.java#L58],
when "hint=top_fc" is randomly specified; the problem arises when it's
specified for a field with no SortedDocValues (the {{null}} comes from
[here|https://github.com/apache/lucene-solr/blob/master/solr/core/src/java/org/apache/solr/uninverting/UninvertingReader.java#L349]).
> Improve robustness of ExpandComponent
> -------------------------------------
>
> Key: SOLR-7798
> URL: https://issues.apache.org/jira/browse/SOLR-7798
> Project: Solr
> Issue Type: Improvement
> Components: SearchComponents - other
> Reporter: Jörg Rathlev
> Assignee: Joel Bernstein
> Priority: Minor
> Attachments: expand-component.patch, expand-npe.patch
>
> Time Spent: 10m
> Remaining Estimate: 0h
>
> The {{ExpandComponent}} causes a {{NullPointerException}} if accidentally
> used without prior collapsing of results.
> If there are multiple documents in the result which have the same term value
> in the expand field, the size of the {{ordBytes}}/{{groupSet}} differs from
> the {{count}} value, and the {{getGroupQuery}} method creates an incompletely
> filled {{bytesRef}} array, which later causes a {{NullPointerException}} when
> trying to sort the terms.
> The attached patch extends the test to demonstrate the error, and modifies
> the {{getGroupQuery}} methods to create the array based on the size of the
> input maps.
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