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https://issues.apache.org/jira/browse/SOLR-6510?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15094530#comment-15094530
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ASF GitHub Bot commented on SOLR-6510:
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Github user cpoerschke closed the pull request at:
https://github.com/apache/lucene-solr/pull/94
> select?collapse=... - fix NPE in Collapsing(FieldValue|Score)Collector
> ----------------------------------------------------------------------
>
> Key: SOLR-6510
> URL: https://issues.apache.org/jira/browse/SOLR-6510
> Project: Solr
> Issue Type: Bug
> Affects Versions: 4.8.1
> Reporter: Christine Poerschke
> Assignee: David Smiley
> Priority: Minor
> Fix For: 4.10.3
>
> Attachments: SOLR-6510_collapse_empty_docvalues.patch
>
>
> Affects branch_4x but not trunk, collapse field must be docValues=true and
> shard empty (or with nothing indexed for the field?).
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