Github user kiszk commented on the issue:
https://github.com/apache/spark/pull/13704
I agree that ```value#63``` is double array type. ```value#63``` is stored
as ```UnsafeArrayData```.
```<function1>``` in ```MapElements <function1>, obj#67: double``` is
represented by Java byte code instead of ```Expressions```. We have to pass an
Java primitive array ``double[]`` instead of double array in
```UnsafeArrayData```. I think that ```Cast``` performs this conversion of
double array from ```UnsafeArrayData``` to ```double[]```. This is an issue
only for Dataset.
What do you think?
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