jcsherin commented on PR #13201:
URL: https://github.com/apache/datafusion/pull/13201#issuecomment-2453934188
> External error: query failed: DataFusion error: Arrow error: Invalid
argument error: It is not possible to concatenate arrays of different data
types.
In the built-in (older) version the output field is defined like:
```rust
fn field(&self) -> Result<Field> {
let nullable = true;
Ok(Field::new(&self.name, self.data_type.clone(), nullable))
}
```
In the current code the implementation of field the data type of the field
is hard-coded as `DataType::UInt64`:
```rust
fn field(&self, field_args: WindowUDFFieldArgs) -> Result<Field> {
let nullable = true;
Ok(Field::new(field_args.name(), DataType::UInt64, nullable))
}
```
To fix this use `field_args` to get the data type of the input expression
rather than hard-coding `DataType::UInt64`.
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