Github user JoshRosen commented on the pull request:
https://github.com/apache/spark/pull/7306#issuecomment-119804768
@davies I think the risk is that if we call `update()` on a column which is
backed by an object in the ObjectPool then we might store a different object in
that object's position in the object pool's backing array, which would cause
the original row to see a different object when accessing the pool.
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