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https://issues.apache.org/jira/browse/LUCENE-5117?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13709893#comment-13709893
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Uwe Schindler commented on LUCENE-5117:
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Damn, fix this. It's horrible with those null checks! :-)
> DISI.iterator() should never return null.
> -----------------------------------------
>
> Key: LUCENE-5117
> URL: https://issues.apache.org/jira/browse/LUCENE-5117
> Project: Lucene - Core
> Issue Type: Bug
> Reporter: Robert Muir
>
> If you have a Filter, you have to check for null twice: Filter.getDocIDSet()
> can return a null DocIDSet, and then DocIDSet.iterator() can return a null
> iterator.
> There is no reason for this: I think iterator() should never return null
> (consistent with terms/postings apis).
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