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https://issues.apache.org/jira/browse/SOLR-6510?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14175514#comment-14175514
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David Smiley commented on SOLR-6510:
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I looked into this a bit, applying Christine's patch. It appears that there
may be a bug in MultiDocValues (a DocValues view over multiple atomic
segments). If there is no value, you *don't* get -1 for the ord, and hence the
test complains. The BytesRef shows to be the empty string. I'll dig into this
more later.
> 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
> Priority: Minor
> Fix For: 4.10.2
>
>
> 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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