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https://issues.apache.org/jira/browse/SOLR-6510?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14156815#comment-14156815
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Joel Bernstein commented on SOLR-6510:
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If I've been following things correctly the next release will be cut from
branch_5x. The CollapsingQParserPlugin has a different implementation for 5.0
that uses the DocValues class, which I believe does not have this issue.
More testing needs to be done with 5.0 implementation to understand the full
effect of this change. The change was made as part of a large patch when the
new DocValues class was introduced to Lucene.
I'll open another ticket as a review for the CollapsingQParserPlugin 5.0.
We can probably close this ticket though.
> 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: Joel Bernstein
> Priority: Minor
>
> 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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