alamb commented on issue #7939:
URL: https://github.com/apache/arrow-rs/issues/7939#issuecomment-3107366092
# `f64` test:
I wrote a test for f64 like this
```rust
#[test]
fn test_cast_decimal128_to_f64_overflow() {
// Test positive overflow (positive infinity)
let array = vec![Some(i128::MAX)];
let array = create_decimal128_array(array, 25, 2).unwrap();
let array = Arc::new(array) as ArrayRef;
let result = cast(&array, &DataType::Float64).unwrap();
let result = result.as_primitive::<Float64Type>();
assert!(result.value(0).is_infinite());
assert!(result.value(0) > 0.0); // Positive infinity
// Test negative overflow (negative infinity)
let array = vec![Some(i128::MIN)];
let array = create_decimal128_array(array, 25, 2).unwrap();
let array = Arc::new(array) as ArrayRef;
let result = cast(&array, &DataType::Float64).unwrap();
let result = result.as_primitive::<Float64Type>();
assert!(result.value(0).is_infinite());
assert!(result.value(0) < 0.0); // Negative infinity
}
```
And it fails like this
```rust
assertion failed: result.value(0).is_infinite()
thread 'cast::tests::test_cast_decimal128_to_f64_overflow' panicked at
arrow-cast/src/cast/mod.rs:8655:9:
assertion failed: result.value(0).is_infinite()
stack backtrace:
0: __rustc::rust_begin_unwind
at
/rustc/6b00bc3880198600130e1cf62b8f8a93494488cc/library/std/src/panicking.rs:697:5
1: core::panicking::panic_fmt
at
/rustc/6b00bc3880198600130e1cf62b8f8a93494488cc/library/core/src/panicking.rs:75:14
2: core::panicking::panic
at
/rustc/6b00bc3880198600130e1cf62b8f8a93494488cc/library/core/src/panicking.rs:145:5
3: arrow_cast::cast::tests::test_cast_decimal128_to_f64_overflow
at ./src/cast/mod.rs:8655:9
4:
arrow_cast::cast::tests::test_cast_decimal128_to_f64_overflow::{{closure}}
at ./src/cast/mod.rs:8647:46
5: core::ops::function::FnOnce::call_once
at
/Users/andrewlamb/.rustup/toolchains/stable-aarch64-apple-darwin/lib/rustlib/src/rust/library/core/src/ops/function.rs:250:5
6: core::ops::function::FnOnce::call_once
at
/rustc/6b00bc3880198600130e1cf62b8f8a93494488cc/library/core/src/ops/function.rs:250:5
note: Some details are omitted, run with `RUST_BACKTRACE=full` for a verbose
backtrace.
```
# `f32` test
I wrote a test for f32 like this:
```rust
#[test]
fn test_cast_decimal128_to_f32_overflow() {
// Test positive overflow (positive infinity)
let array = vec![Some(i128::MAX)];
let array = create_decimal128_array(array, 25, 2).unwrap();
let array = Arc::new(array) as ArrayRef;
let result = cast(&array, &DataType::Float32).unwrap();
let result = result.as_primitive::<Float32Type>();
assert!(result.value(0).is_infinite());
assert!(result.value(0) > 0.0); // Positive infinity
// Test negative overflow (negative infinity)
let array = vec![Some(i128::MIN)];
let array = create_decimal128_array(array, 25, 2).unwrap();
let array = Arc::new(array) as ArrayRef;
let result = cast(&array, &DataType::Float32).unwrap();
let result = result.as_primitive::<Float32Type>();
assert!(result.value(0).is_infinite());
assert!(result.value(0) < 0.0); // Negative infinity
}
```
And it fails like this
```
assertion failed: result.value(0).is_infinite()
thread 'cast::tests::test_cast_decimal128_to_f32_overflow' panicked at
arrow-cast/src/cast/mod.rs:8655:9:
assertion failed: result.value(0).is_infinite()
stack backtrace:
0: __rustc::rust_begin_unwind
at
/rustc/6b00bc3880198600130e1cf62b8f8a93494488cc/library/std/src/panicking.rs:697:5
1: core::panicking::panic_fmt
at
/rustc/6b00bc3880198600130e1cf62b8f8a93494488cc/library/core/src/panicking.rs:75:14
2: core::panicking::panic
at
/rustc/6b00bc3880198600130e1cf62b8f8a93494488cc/library/core/src/panicking.rs:145:5
3: arrow_cast::cast::tests::test_cast_decimal128_to_f32_overflow
at ./src/cast/mod.rs:8655:9
4:
arrow_cast::cast::tests::test_cast_decimal128_to_f32_overflow::{{closure}}
at ./src/cast/mod.rs:8647:46
5: core::ops::function::FnOnce::call_once
at
/Users/andrewlamb/.rustup/toolchains/stable-aarch64-apple-darwin/lib/rustlib/src/rust/library/core/src/ops/function.rs:250:5
6: core::ops::function::FnOnce::call_once
at
/rustc/6b00bc3880198600130e1cf62b8f8a93494488cc/library/core/src/ops/function.rs:250:5
note: Some details are omitted, run with `RUST_BACKTRACE=full` for a verbose
backtrace.
```
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