eitsupi commented on code in PR #3197:
URL: https://github.com/apache/arrow-adbc/pull/3197#discussion_r2244160285
##########
rust/driver_manager/src/lib.rs:
##########
@@ -720,6 +712,7 @@ fn set_option_database(
ERR_ONLY_STRING_OPT,
Status::NotImplemented,
))?,
+ (_, _) => unreachable!(),
Review Comment:
Sorry for the lack of explanation.
Rust's pattern matching will cause a compilation error in the following
cases if enum is extended upstream.
```rs
match version {
AdbcVersion::V100 => ...,
AdbcVersion::V110 => ...,
}
```
This is the same regardless of whether the `non_exhaustive` attribute is
present or not, but if the enum has the `non_exhaustive` attribute, clippy will
seem generate an error in the code above and request the addition of a wildcard
condition.
```rs
match version {
AdbcVersion::V100 => ...,
AdbcVersion::V110 => ...,
_ => ...,
}
```
If we write code like this, it will compile successfully even if the enum is
expanded when the dependent adbc_core is updated.
On the other hand, if there is no wildcard condition, an error will occur at
compile time, making it clear that we need to update to a newer version.
```rs
match version {
AdbcVersion::V100 => ...,
AdbcVersion::V110 => ...,
AdbcVersion::V200 => ...,
}
```
I think that Rust developers are usually familiar with pattern matching, so
using the `non_exhaustive` attribute here would only delay the discovery of the
problem (even if there is no error at compile time, there will eventually be an
error at runtime), so I think it would be better not to use it.
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