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https://issues.apache.org/jira/browse/SOLR-7798?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Michael Gibney updated SOLR-7798:
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Attachment: expand-npe.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
> 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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