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https://issues.apache.org/jira/browse/LUCENE-4919?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13626481#comment-13626481
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Dawid Weiss commented on LUCENE-4919:
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> I was relying on the hashCode to compute a unique identifier for the content
> of a particular IntsRef
This is generally an invalid assumption for *any* hashing function with a
limited target function space. Unless you have something that implements
minimal perfect hashing but this is typically data-specific (and even
precomputed in advance).
> IntsRef, BytesRef and CharsRef return incorrect hashcode when filled with 0
> ---------------------------------------------------------------------------
>
> Key: LUCENE-4919
> URL: https://issues.apache.org/jira/browse/LUCENE-4919
> Project: Lucene - Core
> Issue Type: Bug
> Components: core/other
> Affects Versions: 4.2
> Reporter: Renaud Delbru
> Fix For: 4.3
>
> Attachments: LUCENE-4919.patch
>
>
> IntsRef, BytesRef and CharsRef implementation do not follow the java
> Arrays.hashCode implementation, and return incorrect hashcode when filled
> with 0.
> For example, an IntsRef with \{ 0 \} will return the same hashcode than an
> IntsRef with \{ 0, 0 \}.
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