Joel Bernstein commented on SOLR-7798:

The test case is failing for me. What version are you working with? 

The commit workflow is to commit the master branch and back port to release 

> 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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