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https://issues.apache.org/jira/browse/LUCENE-3624?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13164507#comment-13164507
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Simon Willnauer commented on LUCENE-3624:
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+1 to commit
> Throw exception for "Multi-SortedSource" instead of returning null
> ------------------------------------------------------------------
>
> Key: LUCENE-3624
> URL: https://issues.apache.org/jira/browse/LUCENE-3624
> Project: Lucene - Java
> Issue Type: Task
> Reporter: Robert Muir
> Attachments: LUCENE-3624.patch
>
>
> Spinoff of LUCENE-3623: currently if you addIndexes(FIR) or similar, you get
> a NPE deep within codecs during merge.
> I think the NPE is confusing, it looks like a bug but a clearer exception
> would be an improvement.
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