gabotechs opened a new issue, #20123:
URL: https://github.com/apache/datafusion/issues/20123
### Describe the bug
When going through Substrait in a query with unions, where two different
union-ed columns have the same name, the following error happens:
```
Error: type_coercion
Schema contains duplicate unqualified field name
"foo(bar(tags,Utf8(""baz"")))"
```
This seems to be a regression that started happening in v52 and was
introduced in:
- https://github.com/apache/datafusion/pull/19019
As reverting that PR fixes the problem.
### To Reproduce
Run the new test introduced in
https://github.com/apache/datafusion/pull/20106
### Expected behavior
The test succeeds
### Additional context
_No response_
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