alamb commented on code in PR #4437:
URL: https://github.com/apache/arrow-datafusion/pull/4437#discussion_r1036108112
##########
datafusion/common/src/error.rs:
##########
@@ -333,8 +334,101 @@ impl From<DataFusionError> for io::Error {
}
}
+/// Helper for [`DataFusionError::find_root`].
+enum OtherErr<'a> {
+ Arrow(&'a ArrowError),
+ Dyn(&'a (dyn std::error::Error + Send + Sync + 'static)),
+}
+
+impl DataFusionError {
+ /// Get underlying error.
Review Comment:
```suggestion
/// Get deepest underlying [`DataFusionError`]
///
/// [`DatafusionError`]s sometimes form a chain, such as
`DatafusionError::ArrowError()` in order to conform
/// to the correct error signature. Thus sometimes there is a chain
several layers deep that can obscure the
/// original error. This function finds the lowest level DataFusionError
possible.
///
/// For example, `find_root` will
return`DataFusionError::ResourceExhausted` given the input
/// ```text
/// DataFusionError::ArrowError
/// ArrowError::External
/// Box(DataFusionError::Context)
/// DataFusionError::ResourceExhausted
/// ```
```
##########
datafusion/common/src/error.rs:
##########
@@ -353,6 +447,61 @@ mod test {
assert_eq!(res.to_string(), "Arrow error: Schema error: bar");
}
+ #[test]
+ fn test_find_root_error() {
Review Comment:
👍
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