ttencate opened a new issue, #13568:
URL: https://github.com/apache/datafusion/issues/13568
### Describe the bug
`coalesce()` no longer considers `Utf8` and `Utf8View` columns as the same
type.
### To Reproduce
```rust
use datafusion::common::arrow::array::{ArrayRef, StringArray,
StringViewArray};
use datafusion::common::arrow::record_batch::RecordBatch;
use datafusion::prelude::*;
use std::sync::Arc;
#[tokio::main]
async fn main() {
let ctx = SessionContext::new();
let df = ctx
.read_batch(
RecordBatch::try_from_iter([
(
"utf8",
Arc::new(StringArray::from(vec!["a", "b"])) as ArrayRef,
),
(
"utf8view",
Arc::new(StringViewArray::from(vec!["a", "b"])) as
ArrayRef,
),
])
.unwrap(),
)
.unwrap();
df.select(vec![coalesce(vec![col("utf8"), col("utf8view")])])
.unwrap()
.collect()
.await
.unwrap();
}
```
Result:
```
thread 'main' panicked at src/main.rs:25:10:
called `Result::unwrap()` on an `Err` value: Plan("Execution error:
User-defined coercion failed with Execution(\"Fail to find the coerced type,
errors: Some(Execution(\\\"Expect to get struct but got Utf8\\\"))\") No
function matches the given name and argument types 'coalesce(Utf8, Utf8View)'.
You might need to add explicit type casts.\n\tCandidate
functions:\n\tcoalesce(UserDefined)")
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace
```
### Expected behavior
No error.
### Additional context
It worked fine in version 42.2.0.
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