adriangb commented on PR #14362:
URL: https://github.com/apache/datafusion/pull/14362#issuecomment-2622449713
I don't know if there's any other "known" metadata, but I feel like it would
be good to have an extension trait along the lines of:
```rust
/// Extension of [`Field`] to manage DataFusion specific field metadata.
pub trait DataFusionFieldInfo {
/// A nice docstring!
fn is_system_column(&self) -> bool;
/// Another nice docstring :)
fn as_system_column(mut self) -> Self;
}
impl DataFusionFieldInfo for Field { ... }
```
And then we can call `field.is_system_column()` from anywhere that needs to
check.
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