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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