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https://issues.apache.org/jira/browse/SPARK-9919?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Hyukjin Kwon resolved SPARK-9919.
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Resolution: Incomplete
> Matrices should respect Java's equals and hashCode contract
> -----------------------------------------------------------
>
> Key: SPARK-9919
> URL: https://issues.apache.org/jira/browse/SPARK-9919
> Project: Spark
> Issue Type: Bug
> Components: MLlib
> Reporter: Feynman Liang
> Priority: Critical
> Labels: bulk-closed
>
> The contract for Java's Object is that a.equals(b) implies a.hashCode ==
> b.hashCode. So usually we need to implement both. The problem with hashCode
> is that we shouldn't compute it based on all values, which could be very
> expensive. You can use the implementation of Vector.hashCode as a template,
> but that requires some changes to avoid hash code collisions.
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