Github user srowen commented on the pull request:
https://github.com/apache/spark/pull/11617#issuecomment-194999543
I presume the motivation is simply speed and not copying the array. This
class is not meant to be used outside Spark, so I don't think its API needs to
meet needs except Spark's. In the other usage for the other JIRA, you can just
copy the array before passing it in right? It is documented and as far as I can
tell on purpose.
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