alamb commented on issue #13510:
URL: https://github.com/apache/datafusion/issues/13510#issuecomment-2627761615
Here is a self contained reproducer
I think this only affects `DataFrame` with unnamed relations (if the inputs
have names things are ok)
I suspect this coercion issue has always been lurking, but it became more of
an issue once `Utf8View` became more common
```rust
#[tokio::test]
async fn join_coercion_unnnamed() -> Result<()> {
let ctx = SessionContext::new();
// Test that join will coerce column types when necessary
// even when the relations don't have unique names
let left = ctx.read_batch(record_batch!(
("id", Int32, [1, 2, 3]),
("name", Utf8, ["a", "b", "c"])
)?)?;
let right = ctx.read_batch(record_batch!(
("id", Int32, [10, 3]),
("name", Utf8View, ["d", "c"]) // Utf8View is a different type
)?)?;
let cols = vec!["name", "id"];
let filter = None;
let join = right.join(left, JoinType::LeftAnti, &cols, &cols, filter)?;
let results = join.collect().await?;
assert_batches_sorted_eq!(
[
"+----+----+",
"| id | id |",
"+----+----+",
"| c | c |",
"+----+----+",
],
&results
);
Ok(())
}
```
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