Github user marmbrus commented on the issue:
https://github.com/apache/spark/pull/15333
This seems like a reasonable simplification to me. A little bit of history
(though this has diverged significantly, so don't take this authoritative): I
think this complexity all stems from `SpecificMutableRow`, which had nothing to
do with `Immutable` vs `Mutable`, but instead about having a more efficient row
that you could mutate without boxing. This was back before Tungsten/codegen,
so is probably obsolete now.
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