ZuoTiJia opened a new issue, #5410:
URL: https://github.com/apache/arrow-datafusion/issues/5410
**Describe the bug**
Join two tables with the same schema, then union throws
`SchemaError(DuplicateUnqualifiedField )`
**To Reproduce**
```sql
create table ta(a bigint) as values(1);
create table tb(a bigint) as values(2);
select * from ta join tb on true
union all
select * from ta join tb on true;
```
SchemaError(DuplicateUnqualifiedField { name: "a" })
**Expected behavior**
query sucess.
**Additional context**
datafusion v18.0.0
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