Github user cloud-fan commented on the issue:
https://github.com/apache/spark/pull/13758
There was a discussion about this before. I think it's better to turn
primitive array into unsafe array directly, instead of improving the
performance of generic array data, because after codegen, we always store and
operate on unsafe array.
If you are interested in array type performance, we had a proposal for new
unsafe array format:
https://github.com/apache/spark/pull/12640#discussion_r61539393 , and this will
be very useful for spark sql and mllib. Thanks!
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