haohuaijin commented on PR #9595:
URL:
https://github.com/apache/arrow-datafusion/pull/9595#issuecomment-2006832500
> what is the reason to return with reference? I think it is fine if
unavoidable.
We primarily use `Option<OwnedTableReference>` and `Field` in functions
whose names start with `qualified_field_*.` These functions are designed to
locate a qualified field within a `DFSchema`. Consequently, we return a
`(Option<&OwnedTableReference>, &Field)`, which are references to the original
`DFSchema`. If we were to return `DFField`, it would result in data cloning.
```rust
pub struct DFField {
/// Optional qualifier (usually a table or relation name)
qualifier: Option<OwnedTableReference>,
/// Arrow field definition
field: FieldRef,
}
```
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