Github user rxin commented on the pull request:
https://github.com/apache/spark/pull/7402#issuecomment-121503972
It works with the same two pass approach, doesn't it?
Once you get all the output from expressions, we can compute length in one
pass, and then put data into UnsafeRow in the 2nd pass. It is basically the
same as UnsafeConverter.
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