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https://issues.apache.org/jira/browse/SOLR-8295?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15092768#comment-15092768
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Joel Bernstein commented on SOLR-8295:
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Ah, this is already fixed. I was looking into a bug report today on the users
list for 5.3.1. This bug was introduced in the 5x branch when the numeric
docValues support was added. I suspect it took a long time to surface because
many people are still using the 4x line of code. In the 4x line of code
everything was based on a top level field cache which couldn't have this
problem. I'll report back to the users list about this.
> collapse parser can trigger NPE when a segment has empty DocValues for
> collapse field (ie: no doc in segment has a value)
> -------------------------------------------------------------------------------------------------------------------------
>
> Key: SOLR-8295
> URL: https://issues.apache.org/jira/browse/SOLR-8295
> Project: Solr
> Issue Type: Bug
> Reporter: Steve Rowe
> Assignee: Hoss Man
> Fix For: 5.4, Trunk
>
> Attachments: SOLR-8295.patch
>
>
> When collapsing on a field that doesn't exist for all documents, the
> existence of a segment that does not contain any documents that have a value
> can cause an NPE as the collapse parser assumes the DocValues for a segment
> will always be non-null.
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