alamb opened a new issue, #1987: URL: https://github.com/apache/arrow-rs/issues/1987
**Is your feature request related to a problem or challenge? Please describe what you are trying to do.** DataFusion (and likely other libraries) often wants to implement its own fast comparison functions For example, comparing the contents of an array element by element to form an output `BooleanArray` https://github.com/apache/arrow-datafusion/blob/7617d78809d4ff5bde31142e0744c70024e40635/datafusion/physical-expr/src/expressions/in_list.rs#L50 the `arity::unary` is close to what I want: https://docs.rs/arrow/17.0.0/arrow/compute/kernels/arity/index.html but it can not produce a `BooleanArray` (because` BooleanArray` is not a `PrimitiveArray`) ```rust fn in_list_primitive<T: ArrowPrimitiveType>( array: &PrimitiveArray<T>, values: &[<T as ArrowPrimitiveType>::Native], ) -> Result<BooleanArray> { Ok(arity::unary(array, |x| values.contains(&x))) } ``` **Describe the solution you'd like** I would like a function such as `unary_cmp` that I could call like: ```rust fn in_list_primitive<T: ArrowPrimitiveType>( array: &PrimitiveArray<T>, values: &[<T as ArrowPrimitiveType>::Native], ) -> Result<BooleanArray> { Ok(arity::unary_cmp(array, |x| values.contains(&x))) } ``` There is a proposed implementation: https://github.com/apache/arrow-datafusion/pull/2826 **Describe alternatives you've considered** **Additional context** Add any other context or screenshots about the feature request here. -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: [email protected] For queries about this service, please contact Infrastructure at: [email protected]
