Github user dongjoon-hyun commented on the issue:
https://github.com/apache/spark/pull/18460
I think It's not.
```scala
scala> sql("SELECT '1.1' union all (select 1.1)").explain(true)
...
== Analyzed Logical Plan ==
1.1: string
Union
:- Project [1.1#31]
: +- Project [1.1 AS 1.1#31]
: +- OneRowRelation$
+- Project [cast(1.1#32 as string) AS 1.1#33]
+- Project [1.1 AS 1.1#32]
+- OneRowRelation$
scala> sql("SELECT named_struct('a',1) union all (select
named_struct('A',2))").explain(true)
...
== Analyzed Logical Plan ==
named_struct(a, 1): struct<a:int>
Union
:- Project [named_struct(a, 1) AS named_struct(a, 1)#39]
: +- OneRowRelation$
+- Project [named_struct(A, 2) AS named_struct(A, 2)#40]
+- OneRowRelation$
```
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