aalexandrov opened a new issue, #11464:
URL: https://github.com/apache/datafusion/issues/11464
### Describe the bug
Constructing a schema with duplicate identical qualified names does not
produce an error. I think it should, or we should extend the documentation of
`DFSchema::check_names` to explain why those are allowed and where they are
needed.
### To Reproduce
```rust
use arrow_schema::{DataType, Field};
use datafusion_common::DFSchema;
use datafusion_sql::TableReference;
use std::sync::Arc;
#[test]
fn schema_join() {
let t = || TableReference::bare("t");
let schema = DFSchema::new_with_metadata(
vec![
(Some(t()), Arc::new(Field::new("a", DataType::Int64, true))),
(Some(t()), Arc::new(Field::new("a", DataType::Utf8, false))),
],
Default::default(),
)
.expect("schema");
let schema = format!("{schema:#?}");
println!("{schema}");
}
```
### Expected behavior
Reading through the comments, I would expect to see an error thrown by the
`join` method in this case.
### Additional context
I found this while working on #11456.
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