Github user cloud-fan commented on the pull request:
https://github.com/apache/spark/pull/10374#issuecomment-166819637
agree with @hvanhovell about the meaning of that comment. However, I don't
think we need to change the `copy` method as `Row` is meant to be immutable.
`row.toSeq.toArray` seems a hack to get the underlying array and change value
of the `row`. We should either add doc to say not do this, or fix the `toSeq`
to not leak the backing array.
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