Github user mengxr commented on the pull request:
https://github.com/apache/spark/pull/5081#issuecomment-82979809
The hashCode implementation was taken from Effective Java:
http://stackoverflow.com/questions/10915309/need-explanation-for-hashcode-example-in-effective-java-textbook
`foreachActive` is a private API because we need to consider what operators
to expose together.
@srowen It may help if we implement hashCode and content equals for both
vectors and matrices. It is mostly used for testing.
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