Github user HyukjinKwon commented on the issue:
https://github.com/apache/spark/pull/15677
> However, the complex type we should block. We also need to fix it in the
code.
It does not support complex types already but only `AtomicType`[1].
```
spark-sql> SELECT reverse(array(1));
Error in query: cannot resolve 'reverse(array(1))' due to data type
mismatch: argument 1 requires string type, however, 'array(1)' is of array<int>
type.; line 1 pos 7;
'Project [unresolvedalias(reverse(array(1)), None)]
+- OneRowRelation$
spark-sql> SELECT reverse(map(1, 1));
Error in query: cannot resolve 'reverse(map(1, 1))' due to data type
mismatch: argument 1 requires string type, however, 'map(1, 1)' is of
map<int,int> type.; line 1 pos 7;
'Project [unresolvedalias(reverse(map(1, 1)), None)]
+- OneRowRelation$
spark-sql> SELECT reverse(struct(1, 1));
Error in query: cannot resolve 'reverse(struct(1, 1))' due to data type
mismatch: argument 1 requires string type, however, 'struct(1, 1)' is of
struct<col1:int,col2:int> type.; line 1 pos 7;
'Project [unresolvedalias(reverse(struct(1, 1)), None)]
+- OneRowRelation$
spark-sql> SELECT reverse(1);
1
Time taken: 0.049 seconds, Fetched 1 row(s)
spark-sql> SELECT reverse(12);
21
Time taken: 0.053 seconds, Fetched 1 row(s)
spark-sql> SELECT reverse(12.0D);
0.21
Time taken: 0.046 seconds, Fetched 1 row(s)
spark-sql> SELECT reverse(12BD);
21
Time taken: 0.035 seconds, Fetched 1 row(s)
spark-sql> SELECT reverse(12L);
21
Time taken: 0.034 seconds, Fetched 1 row(s)
spark-sql>
```
[1]https://github.com/apache/spark/blob/39e2bad6a866d27c3ca594d15e574a1da3ee84cc/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/TypeCoercion.scala#L685-L720
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