Github user rxin commented on the pull request:
https://github.com/apache/spark/pull/7402#issuecomment-121508498
Why is it a large refactor? All you need is track the current buffer size,
and if length of the current row > buffer size, reallocate a buffer.
BTW once you do this, we basically replace GenerateMutableProjection with
this new GenerateUnsafeProjection.
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