nuno-faria commented on PR #20106:
URL: https://github.com/apache/datafusion/pull/20106#issuecomment-3846112333
That's quite the bug!
```
Projection: foo AS col1, bar AS col2
Union
Projection: foo, bar
Values: (Int64(100), Int64(200))
Projection: x, foo
Values: (Int32(300), Int64(400))
```
Because `x` has a different type, it will be casted to `Int64`. In the cast,
an alias is added to the original name. However, in this case `dst_schema` will
not contain the original column names, but rather the names of the first
relation, since this is an union. So the second projection is temporarily `foo`
(casted an alised) and `foo`, hence the duplicate error.
I will try to push a fix soon.
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