viirya commented on code in PR #3021:
URL: https://github.com/apache/arrow-rs/pull/3021#discussion_r1014570319
##########
arrow-cast/src/cast.rs:
##########
@@ -344,16 +348,58 @@ fn cast_floating_point_to_decimal128<T:
ArrowPrimitiveType>(
array: &PrimitiveArray<T>,
precision: u8,
scale: u8,
+ cast_options: &CastOptions,
) -> Result<ArrayRef, ArrowError>
where
<T as ArrowPrimitiveType>::Native: AsPrimitive<f64>,
{
let mul = 10_f64.powi(scale as i32);
- array
- .unary::<_, Decimal128Type>(|v| (v.as_() * mul).round() as i128)
- .with_precision_and_scale(precision, scale)
- .map(|a| Arc::new(a) as ArrayRef)
+ if cast_options.safe {
+ let iter = array.iter().map(|v| {
+ v.and_then(|v| {
+ let mul_v = (mul * v.as_()).round() as i128;
Review Comment:
The only case that might be "overflow" here is an infinity value. After
converting to `i128`, it is `i128::MAX` that is over the range of decimal 128.
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