jayzhan211 commented on issue #13325:
URL: https://github.com/apache/datafusion/issues/13325#issuecomment-2466240811
You can try TypeSignature::String now if you want to coerce any type to
string.
The current logic is which won't coerce Utf8 to LargeUtf8
```rust
pub fn string_coercion(lhs_type: &DataType, rhs_type: &DataType) ->
Option<DataType> {
use arrow::datatypes::DataType::*;
match (lhs_type, rhs_type) {
// If Utf8View is in any side, we coerce to Utf8View.
(Utf8View, Utf8View | Utf8 | LargeUtf8) | (Utf8 | LargeUtf8,
Utf8View) => {
Some(Utf8View)
}
// Then, if LargeUtf8 is in any side, we coerce to LargeUtf8.
(LargeUtf8, Utf8 | LargeUtf8) | (Utf8, LargeUtf8) => Some(LargeUtf8),
// Utf8 coerces to Utf8
(Utf8, Utf8) => Some(Utf8),
_ => None,
}
}
```
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