Github user nongli commented on the pull request:
https://github.com/apache/spark/pull/10374#issuecomment-166731474
The comment in GenericRow explicitly says not to do this.
"A row implementation that uses an array of objects as the underlying
storage. Note that, while
the array is not copied, and thus could technically be mutated after
creation, this is not
allowed."
If we change the behavior, we should update that too.
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