crepererum commented on code in PR #13293:
URL: https://github.com/apache/datafusion/pull/13293#discussion_r1834173817
##########
datafusion/common/src/stats.rs:
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@@ -31,6 +31,14 @@ pub enum Precision<T: Debug + Clone + PartialEq + Eq +
PartialOrd> {
Exact(T),
/// The value is not known exactly, but is likely close to this value
Inexact(T),
+ /// The value is know to be at most (inclusive) of this value.
+ ///
+ /// The actual value may be smaller, but it is never greater.
+ AtMost(T),
Review Comment:
I wonder if a range semantics would be nicer, i.e.:
```rust
struct Precision {
lower: Option<T>,
upper: Option<T>,
}
```
And then you have:
| Big Enum | Lower | Upper |
| --------- | --------- | --------- |
| `Exact` | `Some(x)` | `Some(x)` |
| `Inexact` | -- | -- |
| `AtMost` | `None` | `Some(x)` |
| `AtLeast` | `Some(x)` | `None` |
| `Absent` | `None` | `None` |
| -- | `Some(x)` | `Some(y)` |
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