[jira] [Created] (SOLR-7798) Improve robustness of ExpandComponent

["Jörg Rathlev (JIRA)" <ji...@apache.org>]

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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