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https://issues.apache.org/jira/browse/LUCENE-5423?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13886535#comment-13886535
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Jakob Zwiener commented on LUCENE-5423:
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A pull request with a test and a possible fix has been sent on github.
> OpenBitSet hashCode and equals incongruent
> --
>
> Key: LUCENE-5423
> URL: https://issues.apache.org/jira/browse/LUCENE-5423
> Project: Lucene - Core
> Issue Type: Bug
> Components: core/other
>Affects Versions: 4.6.1
>Reporter: Jakob Zwiener
> Original Estimate: 0.5h
> Remaining Estimate: 0.5h
>
> In org.apache.lucene.util.OpenBitSet the hashCode method might return
> different hash codes for equal bitsets.
> This happens when there are bits set in words right of wlen. This might
> happen through a getAndSet call (the documentation states that getAndSet may
> only be called on positions that are smaller than the size - which is the
> length of the array not wlen - this might be another issue).
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