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

["Michael Gibney (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/SOLR-7798?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Michael Gibney updated SOLR-7798:
---------------------------------
    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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