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https://issues.apache.org/jira/browse/LUCENE-4940?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Simon Willnauer resolved LUCENE-4940.
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Resolution: Fixed
> ToParentBlockJoinQuery throws exception on empty parent filter DocIdSet
> -----------------------------------------------------------------------
>
> Key: LUCENE-4940
> URL: https://issues.apache.org/jira/browse/LUCENE-4940
> Project: Lucene - Core
> Issue Type: Bug
> Components: modules/join
> Affects Versions: 5.0, 4.3
> Reporter: Simon Willnauer
> Assignee: Simon Willnauer
> Fix For: 5.0, 4.3
>
> Attachments: LUCENE-4940.patch
>
>
> previously DocIdSet.EMPTY_DOCIDSET retuned NO_MORE_DOCS by default when
> DocIdSetIterator#docId() was called but since LUCENE-4924 we return -1 if the
> empty iterator is unpositioned / not exhausted. This causes an
> IllegalStateException since we couldn't detect the empty DocIdSet. Our tests
> somehow don't catch this and I ran into it integrating my RC0 that I build
> into ES last night so this is unreleased...
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