[GitHub] [arrow] alamb commented on pull request #9230: ARROW-11022: [Rust] Upgrade to Tokio 1.0

[GitBox <gi...@apache.org>]

alamb commented on pull request #9230:
URL: https://github.com/apache/arrow/pull/9230#issuecomment-761777508


   > Since rust crate version numbers without leading '^' sometimes leads to confusions, how about prepend the versions changed in this PR with '^' to make it more clear?
   
   @mqy  -- I think it is common in rust projects (especially library crates like Arrow) to allow some flexibility in their dependencies and thus not prefix with `^`. 
   
   Cargo claims to implement [semve](https://semver.org/) -- which I think means  in theory crate publishers should take care and ensure that "non major version upgrades" (aka 1.2.1 --> 1.2.2, or 1.2.1 --> 1.3.0) don't contain breaking changes. If you use the `^` prefix we would prevent crates / projects that depend of Arrow from using anything other than the exact version specified. 
   
   As you saw, the parquet-format crate didn't follow the semver versioning convention thus breaking our CI :(


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