Github user rxin commented on the pull request:
https://github.com/apache/spark/pull/7402#issuecomment-121498979
@davies maybe I'm missing something - but what I had in mind was to have a
version of GenerateProjection that just projects directly into an UnsafeRow.
The projection should take arbitrary expressions -- so it can handle more than
just converting an InternalRow into UnsafeRow.
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