Github user cloud-fan commented on the issue:
https://github.com/apache/spark/pull/13526
That's a good point, let's focus on `ds.groupBy(...).mapValues(...)` then.
One thought, in `mapValues`, we will project away the previous value
attributes, so the workflow should be:
```
convert UnsafeRow to T
apply func1 to T to generate U
convert U to UnsafeRow
apply func2 to T to generate W
convert W to UnsafeRow
join the two new UnsafeRows, without the original row.
```
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