Github user cloud-fan commented on the pull request:
https://github.com/apache/spark/pull/10816#issuecomment-172667569
The hash exprssion is slow on simple schema because the `UnsafeProjection`
has some unnecessary opeations every round and will hurt the performance if
each round is quite small(like simple schema), this can be fixed by
https://github.com/apache/spark/pull/10809. For array type, still investigate.
cc @nongli
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