Jörg Rathlev created SOLR-7798:
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Summary: 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
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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