matthewmturner commented on issue #14396:
URL: https://github.com/apache/datafusion/issues/14396#issuecomment-6726781366
The additional expected cases from the description also work
```
> create table u as values
(
{ 'foo': 'baz', 'bar': 'bux' },
{ 'bar': 'b', 'foo': 'bt' }
);
0 row(s) fetched.
Elapsed 0.002 seconds.
> SELECT column1 FROM u UNION ALL SELECT column2 FROM u;
+----------------------+
| column1 |
+----------------------+
| {foo: baz, bar: bux} |
| {foo: bt, bar: b} |
+----------------------+
2 row(s) fetched.
Elapsed 0.034 seconds.
```
```
> create table v as values
(
{ 'foo': 'baz', 'bar': 'bux' },
{ 'bar': 'b', 'foo': arrow_cast('bt', 'Utf8View') }
);
0 row(s) fetched.
Elapsed 0.002 seconds.
> DESCRIBE SELECT column1 FROM v UNION ALL SELECT column2 FROM v;
+-------------+--------------------------------------+-------------+
| column_name | data_type | is_nullable |
+-------------+--------------------------------------+-------------+
| column1 | Struct("foo": Utf8View, "bar": Utf8) | NO |
+-------------+--------------------------------------+-------------+
1 row(s) fetched.
Elapsed 0.001 seconds.
```
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