[GitHub] [arrow-rs] matthewmturner opened a new issue #1119: Add power compute kernel

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

matthewmturner opened a new issue #1119:
URL: https://github.com/apache/arrow-rs/issues/1119


   **Is your feature request related to a problem or challenge? Please describe what you are trying to do.**
   A clear and concise description of what the problem is. Ex. I'm always frustrated when [...] 
   (This section helps Arrow developers understand the context and *why* for this feature, in addition to  the *what*)
   We are working on adding a `power` function / operator to datafusion (https://github.com/apache/arrow-datafusion/issues/1493).  Rather than implementing in datafusion i propose adding it as a compute kernel in arrow because we can implement directly with rust float primitives (https://doc.rust-lang.org/std/primitive.u32.html#method.pow, https://doc.rust-lang.org/std/primitive.f32.html#method.powf, etc) without any additional logic, similar to existing arrow compute kernels, and this aligns with the C++ compute implementation (https://arrow.apache.org/docs/cpp/compute.html#arithmetic-functions) and arrow2 (https://github.com/jorgecarleitao/arrow2/blob/main/src/compute/arithmetics/basic/pow.rs)
   
   **Describe the solution you'd like**
   `power` (using two arrays) and `power_scalar` (array and scalar) compute kernels
   
   **Describe alternatives you've considered**
   A clear and concise description of any alternative solutions or features you've considered.
   
   **Additional context**
   Add any other context or screenshots about the feature request here.
   


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[GitHub] [arrow-rs] jackwener commented on issue #1119: Add power compute kernel

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

jackwener commented on issue #1119:
URL: https://github.com/apache/arrow-rs/issues/1119#issuecomment-1065836337


   I notices some code in `arrow/src/compute/kernels/arithmetic.rs`
   
   ```rust
   pub fn powf_scalar<T>(
       array: &PrimitiveArray<T>,
       raise: T::Native,
   ) -> Result<PrimitiveArray<T>>
   ```


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