mapleFU opened a new issue, #1415: URL: https://github.com/apache/iceberg-rust/issues/1415
### Apache Iceberg Rust version None ### Describe the bug OrderedFloat[1] says: > All NaN values are considered equal, even though they may have different [bits](https://doc.rust-lang.org/std/primitive.f64.html#method.to_bits), and therefore different [sign](https://doc.rust-lang.org/std/primitive.f64.html#method.is_sign_positive), signaling/quiet status, and NaN payload bits. And iceberg[2] requires: > Sorting floating-point numbers should produce the following behavior: -NaN < -Infinity < -value < -0 < 0 < value < Infinity < NaN. This aligns with the implementation of Java floating-point types comparisons. [1] https://docs.rs/ordered-float/latest/ordered_float/struct.OrderedFloat.html [2] https://iceberg.apache.org/spec/#sorting ### To Reproduce ```rust use ordered_float::OrderedFloat; use std::f64::{NAN, NEG_INFINITY}; fn main() { // 创建 NAN 和 -NAN let nan = NAN; let neg_nan = -NAN; println!("原始浮点数比较:"); println!("NAN == NAN: {}", nan == nan); println!("NAN == -NAN: {}", nan == neg_nan); println!("-NAN == -NAN: {}", neg_nan == neg_nan); println!(); // 使用 OrderedFloat 包装 let ordered_nan = OrderedFloat(nan); let ordered_neg_nan = OrderedFloat(neg_nan); println!("OrderedFloat 比较:"); println!("OrderedFloat(NAN) == OrderedFloat(NAN): {}", ordered_nan == ordered_nan); println!("OrderedFloat(NAN) == OrderedFloat(-NAN): {}", ordered_nan == ordered_neg_nan); println!("OrderedFloat(-NAN) == OrderedFloat(-NAN): {}", ordered_neg_nan == ordered_neg_nan); println!(); } ``` output: ``` 原始浮点数比较: NAN == NAN: false NAN == -NAN: false -NAN == -NAN: false OrderedFloat 比较: OrderedFloat(NAN) == OrderedFloat(NAN): true OrderedFloat(NAN) == OrderedFloat(-NAN): true OrderedFloat(-NAN) == OrderedFloat(-NAN): true ``` ### Expected behavior -NAN < NAN ### Willingness to contribute None -- 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: issues-unsubscr...@iceberg.apache.org.apache.org For queries about this service, please contact Infrastructure at: us...@infra.apache.org --------------------------------------------------------------------- To unsubscribe, e-mail: issues-unsubscr...@iceberg.apache.org For additional commands, e-mail: issues-h...@iceberg.apache.org
