[GitHub] [arrow-rs] mwlon commented on issue #3849: Cargo.toml dependencies aren't accurate

["mwlon (via GitHub)" <gi...@apache.org>]

mwlon commented on issue #3849:
URL: https://github.com/apache/arrow-rs/issues/3849#issuecomment-1626396588

   I was getting errors trying to install recent versions of arrow:
   ```bash
   error[E0432]: unresolved import `num::complex::ComplexFloat`
     --> /Users/martin/.cargo/registry/src/index.crates.io-6f17d22bba15001f/arrow-array-30.0.1/src/arithmetic.rs:21:5
      |
   21 | use num::complex::ComplexFloat;
      |     ^^^^^^^^^^^^^^^^^^^^^^^^^^ no `ComplexFloat` in `complex`
   
   error[E0599]: no method named `powi` found for struct `f16` in the current scope
      --> /Users/martin/.cargo/registry/src/index.crates.io-6f17d22bba15001f/arrow-array-30.0.1/src/arithmetic.rs:351:25
       |
   351 |                 Ok(self.powi(exp as i32))
       |                         ^^^^ method not found in `f16`
   ...
   380 | native_type_float_op!(f16, f16::ONE, f16::ZERO);
       | ----------------------------------------------- in this macro invocation
       |
       = help: items from traits can only be used if the trait is in scope
       = note: this error originates in the macro `native_type_float_op` (in Nightly builds, run with -Z macro-backtrace for more info)
   help: the following traits are implemented but not in scope; perhaps add a `use` for one of them:
       |
   18  + use num::Float;
       |
   18  + use num::traits::float::FloatCore;
       |
   18  + use num::traits::real::Real;
       |
   
   error[E0599]: no method named `powi` found for struct `f16` in the current scope
      --> /Users/martin/.cargo/registry/src/index.crates.io-6f17d22bba15001f/arrow-array-30.0.1/src/arithmetic.rs:356:22
       |
   356 |                 self.powi(exp as i32)
       |                      ^^^^ method not found in `f16`
   ...
   380 | native_type_float_op!(f16, f16::ONE, f16::ZERO);
       | ----------------------------------------------- in this macro invocation
       |
       = help: items from traits can only be used if the trait is in scope
       = note: this error originates in the macro `native_type_float_op` (in Nightly builds, run with -Z macro-backtrace for more info)
   help: the following traits are implemented but not in scope; perhaps add a `use` for one of them:
       |
   18  + use num::Float;
       |
   18  + use num::traits::float::FloatCore;
       |
   18  + use num::traits::real::Real;
       |
   ```
   
    It seemed to become problematic between 30 and 35. I was able to fix this by adding
    ```
    num-complex = "0.4.3"
    ```
   to my Cargo.toml. I've submitted #4482 .


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