slfan1989 opened a new issue, #3654:
URL: https://github.com/apache/iceberg-rust/issues/3654
### Apache Iceberg Rust version
0.10.1
### Describe the bug
`Datum::decimal_from_str` silently returns incorrect values for some finite
decimal inputs. It parses `1e3` as `1` because the positive exponent is lost
when extracting the unscaled coefficient. It also accepts a 39-digit positive
integer that exceeds Iceberg's maximum decimal precision of 38 digits and
returns a negative value.
### To Reproduce
```
use iceberg::spec::Datum;
for input in ["1e3", "170141183460469231731687303715884105729"] {
println!("{input} -> {}", Datum::decimal_from_str(input).unwrap());
}
```
Actual output
```
1e3 -> 1
170141183460469231731687303715884105729 ->
-170141183460469231731687303715884105727
```
### Expected behavior
- "1e3" should produce the same decimal datum as "1000".
- An input that exceeds the supported precision should return
`ErrorKind::DataInvalid`.
### Willingness to contribute
None
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