Github user liancheng commented on the issue:
https://github.com/apache/spark/pull/15976
A similar alternative fix @yhuai proposed is to convert the underlying
`UnsafeRow` into a safe row (i.e. `GenericInternalRow` in this case) using a
projection instead of simply adding a `.copy()`. In this way, we prevent adding
unsafe data into a safe row, which is in general safer. This approach further
affects performance, though.
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