Github user mengxr commented on the pull request:
https://github.com/apache/spark/pull/8042#issuecomment-130159360
@feynmanliang 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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