Github user kiszk commented on the issue:
https://github.com/apache/spark/pull/13704
@cloud-fan , regarding a ```cast```, I think that you are correct. When we
insert a ```cast```, I pass information on ```ArrayType.containsNull``` to
```Cast``` now. In this case, it is ```false```. As a result, after the logical
optimizations, we got a plan tree with ```Cast```. I updated the description of
PR.
```
== Analyzed Logical Plan ==
value: double
SerializeFromObject [input[0, double, true] AS value#6]
+- MapElements <function1>, obj#5: double
+- DeserializeToObject cast(value#1 as array<double>).toDoubleArray,
obj#4: [D
+- LocalRelation [value#1]
== Optimized Logical Plan ==
SerializeFromObject [input[0, double, true] AS value#6]
+- MapElements <function1>, obj#5: double
+- DeserializeToObject value#1.toDoubleArray, obj#4: [D
+- LocalRelation [value#1]
```
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