matthewmturner commented on issue #14396:
URL: https://github.com/apache/datafusion/issues/14396#issuecomment-6724581723
So starting with reproduction from what was reported in the issue.
With the following DDL.
```
create table t as values
(
{ 'foo': 'baz' },
{ 'xxx': arrow_cast('blarg', 'Utf8View') } -- column4 has List of Struct w/
Utf8View and a different field name
);
```
The first query now correctly fails:
```
> select column1 from t UNION ALL select column2 from t;
This feature is not implemented: Unsupported CAST from Struct("xxx":
Utf8View) to Struct("foo": Utf8View)
```
But the second query still works:
```
select CASE WHEN 1=2 THEN column1 ELSE column2 END from t ;
+-----------------------------------------------------------------+
| CASE WHEN Int64(1) = Int64(2) THEN t.column1 ELSE t.column2 END |
+-----------------------------------------------------------------+
| {xxx: blarg} |
+-----------------------------------------------------------------+
1 row(s) fetched.
Elapsed 0.001 seconds.
```
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