2010YOUY01 commented on PR #23140:
URL: https://github.com/apache/datafusion/pull/23140#issuecomment-4786845454

   > Thank you for opening this pull request!
   > 
   > Reviewer note: 
[cargo-semver-checks](https://github.com/obi1kenobi/cargo-semver-checks) 
reported the current version number is not SemVer-compatible with the changes 
in this pull request (compared against the base branch).
   > 
   > Details
   
   It suggests to use `#[non_exhaustive]`
   
   ```
   // library crate
   #[non_exhaustive]
   pub enum Color {
       Red,
       Green,
   }
   ```
   Then downstream crate must include wildcard `_` and later adding new enum 
variant won't be counted as a breaking change.
   
   ```
   match color {
       Color::Red => "red",
       Color::Green => "green",
       _ => "unknown future color",
   }
   ```
   
   I think it's better to keep it as a breaking change and require downstreams 
to update.


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