viirya commented on code in PR #6836:
URL: https://github.com/apache/arrow-rs/pull/6836#discussion_r1870647169
##########
arrow-cast/src/cast/decimal.rs:
##########
@@ -155,28 +163,24 @@ where
T: DecimalType,
T::Native: DecimalCast + ArrowNativeTypeOp,
{
- let array: PrimitiveArray<T> = match input_scale.cmp(&output_scale) {
- Ordering::Equal => {
- // the scale doesn't change, the native value don't need to be
changed
- array.clone()
- }
- Ordering::Greater => convert_to_smaller_scale_decimal::<T, T>(
- array,
- input_scale,
- output_precision,
- output_scale,
- cast_options,
- )?,
- Ordering::Less => {
- // input_scale < output_scale
+ let array: PrimitiveArray<T> = if input_scale <= output_scale {
+ // input_scale <= output_scale
+ // the scale doesn't change, but precision may change and cause
overflow
Review Comment:
12345 in (5, 3) is 12.345. When casting to (6, 3), it is still 12345, why it
needs to be 123450? 123450 in (6, 3) is 123.45. If I understand it correctly.
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