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Posted to github@arrow.apache.org by GitBox <gi...@apache.org> on 2021/12/16 09:21:12 UTC

[GitHub] [arrow-rs] Urgau commented on issue #1043: support numeric to decimal data type

Urgau commented on issue #1043:
URL: https://github.com/apache/arrow-rs/issues/1043#issuecomment-995587006


   > I bisected the 1e-15 conversion regression down to this change-set between nightlies.
   > 
   > [rust-lang/rust@1af55d1...efd0483](https://github.com/rust-lang/rust/compare/1af55d19c...efd048394)
   
   From your range of commit you can see that there is a commit named [Automatic exponential formatting in Debug](https://github.com/rust-lang/rust/commit/8731d4dfb479914a91f650f4f124528e332e8128) that added an internal logic that switch to the exponential representation in some cases when using the `Debug` formatter.
   Rust make no promises about `Debug` formatting and can change it's output anytime for any reason but this is not the case for the `Display` formatter which has guaranties for how it display thing.
   
   I would suggest changing your formatting to the `Display` (ie `write!(f, "{:?}", value)` -> `write!(f, "{}", value)`) formatter.


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