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https://issues.apache.org/jira/browse/SOLR-7798?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16373072#comment-16373072
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Joel Bernstein commented on SOLR-7798:
--------------------------------------

I believe the patch will indeed make things more robust. It looks like to me if 
there are duplicate values in the ordBytes map then we'll just have duplicate 
values in the disjunction query, which will make things slower, but still work 
fine.

So, I see no problem with the patch.

 

> 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
>
>
> 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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